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Natural 5 ct Ruby Teardrop Pendant with Diamond in Platinum
By ANGARA INC.
Located in Los Angeles, CA
This classic solitaire pendant features a pear-shaped ruby secured in a prong setting. A brilliant
Category

21st Century and Contemporary American Modern Pendant Necklaces

Materials

Diamond, Ruby, Platinum

Natural 5 ct Ruby Teardrop Pendant with Diamond in 925 Sterling Silver
By ANGARA INC.
Located in Los Angeles, CA
This classic solitaire pendant features a pear-shaped ruby secured in a prong setting. A brilliant
Category

21st Century and Contemporary American Modern Pendant Necklaces

Materials

Diamond, Ruby, Sterling Silver

Natural 5 ct Ruby Teardrop Pendant with Diamond in 14K Rose Gold
By ANGARA INC.
Located in Los Angeles, CA
This classic solitaire pendant features a pear-shaped ruby secured in a prong setting. A brilliant
Category

21st Century and Contemporary American Modern Pendant Necklaces

Materials

Diamond, Ruby, Rose Gold, 14k Gold

Natural 5 ct Ruby Teardrop Pendant with Diamond in 18K White Gold
By ANGARA INC.
Located in Los Angeles, CA
This classic solitaire pendant features a pear-shaped ruby secured in a prong setting. A brilliant
Category

21st Century and Contemporary American Modern Pendant Necklaces

Materials

Diamond, Ruby, White Gold, 18k Gold

Natural 5 ct Ruby Teardrop Pendant with Diamond in 14K Yellow Gold
By ANGARA INC.
Located in Los Angeles, CA
This classic solitaire pendant features a pear-shaped ruby secured in a prong setting. A brilliant
Category

21st Century and Contemporary American Modern Pendant Necklaces

Materials

Diamond, Ruby, Yellow Gold, 14k Gold

Natural 5 ct Ruby Teardrop Pendant with Diamond in 14K White Gold
By ANGARA INC.
Located in Los Angeles, CA
This classic solitaire pendant features a pear-shaped ruby secured in a prong setting. A brilliant
Category

21st Century and Contemporary American Modern Pendant Necklaces

Materials

Diamond, Ruby, White Gold, 14k Gold

Natural 5 ct Ruby Teardrop Pendant with Diamond in 18K Rose Gold
By ANGARA INC.
Located in Los Angeles, CA
This classic solitaire pendant features a pear-shaped ruby secured in a prong setting. A brilliant
Category

21st Century and Contemporary American Modern Pendant Necklaces

Materials

Diamond, Ruby, Rose Gold, 18k Gold

Natural 5 ct Ruby Teardrop Pendant with Diamond in 18K Yellow Gold
By ANGARA INC.
Located in Los Angeles, CA
This classic solitaire pendant features a pear-shaped ruby secured in a prong setting. A brilliant
Category

21st Century and Contemporary American Modern Pendant Necklaces

Materials

Diamond, Ruby, Yellow Gold, 18k Gold

Platinum Ring with 3 ct. Vivid Red Ruby & 3.26 ct. Diamonds
Located in Antwerp, BE
Magnificent Platinum Ring with Vivid Red Ruby &3.26 ct. Diamonds. Ruby looks lik 4.5 to 5 Ct
Category

20th Century European Artisan Fashion Rings

Materials

Diamond, Ruby, Platinum

Vintage Estate 18 Karat White Gold Diamond and Ruby Earrings
Located in Great Neck, NY
ct. ruby Measurements: 26.20 x 18.52 mm
Category

Early 2000s Modern More Earrings

Materials

Diamond, Ruby, 18k Gold

GRS Certified 5 Ct. Mozambique Ruby VIVID Red Diamond Necklace
Located in Chicago, IL
pendant set with a cushion-shaped vivid red ruby weighing 5 carats. The ruby is surrounded by a stunning
Category

2010s American Contemporary Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold, White Gold

2.5 Ct Emerald Cut Treated Ruby & 0.15 ct Diamond Ring 14 Kt White Gold Size 5
Located in New York, NY
2.5 Ct Emerald Cut Treated Ruby & 0.15 ct Diamond Ring 14 Kt White Gold Size 5 Introducing a truly
Category

2010s Cocktail Rings

Materials

Diamond, Ruby, Emerald, 14k Gold, White Gold

5 Carat Pear Treated Ruby & 0.25 ct Diamond Ring 14 Karat White Gold Size 4.5
Located in New York, NY
Introducing a truly stunning piece, behold the 5 Carat Oval Treated Ruby & 0.25 ct Diamond Ring in
Category

2010s Cocktail Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

GIA Certified Natural 50 Ct Ceylon NH Ruby & 8 Ct Diamond Apple 18 K Pin/Brooch
Located in New York, NY
GIA Certified Natural NO HEAT 50 Ct Ceylon Ruby & 5 Ct Diamond Big Apple 18 K Pin/Brooch GIA Report
Category

1990s Brooches

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

Antique Butterfly Brooch Pin 2ct Ruby 1.5 ct Diamond 10K Gold Silver / 3.9gr.
Located in SE
/ ca. 1 ct , second Ruby is of sort of transitional oval / old cushion cut ca. 7.25 mm x 4 .5 mm / ca.1
Category

Antique Mid-18th Century European Renaissance Revival Brooches

Materials

Diamond, Ruby, 10k Gold, Silver

Modern Ruby Diamond 18K White Gold Necklace For Her
By Natkina
Located in Montreux, CH
Necklace 18K White Gold Weight 3.38 GMS, Ruby-5/0.90 ct Diamond - 4-0.23 ct Length 42CM This
Category

21st Century and Contemporary Swiss Modern Pendant Necklaces

Materials

Diamond, Ruby, Gold, White Gold

Vintage Hammerman Brothers Diamond Ruby Dome Yellow Gold Ring
By Unbranded
Located in New York, NY
=Mint condition -18k Yellow Gold -Ring size: 5 -Diamonds: 1.00 ct -Rubies: 0.5ct -Comes with
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Ruby, 10k Gold, Yellow Gold

Italian Ruby Black Diamond White Gold Ring for Her
By Natkina
Located in Montreux, CH
White Gold 14K Ring (Matching Earrings Available) Diamond 36-RND 57-0,25-4/6 Ruby 5-Oval-1,37 ct
Category

2010s Cocktail Rings

Materials

Black Diamond, Ruby, White Diamond, Diamond, Gold, White Gold, 14k Gold

Vintage Circa 1990s 18k Gold Natural Diamond And Ruby Decorated Tennis Bracelet
Located in Fatih/İstanbul, 34
color and vvs-vs clarity. Totally is ruby 5 ct. Total lenght is bracelet 18 cm. Box is not included
Category

1990s European Retro Tennis Bracelets

Materials

Diamond, Ruby, 18k Gold

Baguettes Diamonds & Princess Cut Natural Burma Ruby Ring 14 Karat Yellow Gold
Located in New York, NY
, VS1 and G color Ruby Burma natural : approximately 1 Ct .5 princess cut rubies Ring size 6.5 but
Category

2010s Wedding Rings

Materials

Diamond, Ruby, 14k Gold, Yellow Gold

Hammerman Brothers Diamond Ruby Dome Yellow Gold Ring
By Hammerman Brothers
Located in New York, NY
-Mint condition -18k Yellow Gold -Ring size: 5 -Diamonds: 1.00 ct -Rubies: 0.5ct -Comes with
Category

2010s Cocktail Rings

NEW Natural Precious Ruby and Diamond Tennis Bracelet 14k Gold
Located in Warren, NJ
Diamond Tennis Bracelet Never Worn. Length: 7 3/8 TCW 5 Rubies: 2.5 ct TCW 10 Diamonds: .63 ct TGW
Category

Late 20th Century Link Bracelets

MOISEIKIN 18 Karat White Gold 1 carat Diamond Flower Pendant Necklace
By MOISEIKIN
Located in Hong Kong, HK
weight 6.41 gr. Chain lengh : 45"+5"cm 36 Diamond G/VS, 1.13 ct. 5 Ruby, 0.13 ct. Cleaning: Cleaning
Category

2010s Thai Contemporary Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold, White Gold

MOISEIKIN 18 Karat White Gold Pink Sapphire Floral Necklace
By MOISEIKIN
Located in Hong Kong, HK
Gold : Total weight 6.12 gr. 16 Pink sapphier, 1.15 ct. 5 Ruby, 0.12 ct. 20 Diamond, 0.17 ct
Category

2010s Thai Contemporary Pendant Necklaces

Materials

Diamond, Ruby, Sapphire, Pink Sapphire, 18k Gold, White Gold

Moiseikin 18K White Gold Diamond Flower Pendant
By MOISEIKIN
Located in Hong Kong, HK
106000109002 Gold 18 K,Weight 1.71 g, 78 Diamond 0.755 ct 5 Ruby 0.09 ct * Plus 18K White gold 0.8mm slide
Category

2010s Russian Contemporary Pendant Necklaces

Materials

Diamond, Ruby, Gold, 18k Gold, White Gold

MOISEIKIN 18 Karat Gold Diamond Pink Sapphire Flower Ring
By MOISEIKIN
Located in Hong Kong, HK
Gold 18 K,Weight 4.66 g,Size 17 (mm diameter), 4 Diamond 0.151 ct 87 Sapphire 0.68ct 5 Ruby 0.065 ct
Category

2010s Hong Kong Contemporary Fashion Rings

Materials

Pink Sapphire, Ruby, Diamond, 18k Gold, Gold

5/8 ct. Ruby and Diamond Accent Curvilinear Migraine Shank 14K Yellow Gold Ring
By Affinity Designs LLC
Located in New York, NY
Indulge in the elegance of our Pear-Cut Ruby and Diamond Accent Curvilinear Migraine Shank Ring in
Category

2010s Asian Contemporary Fashion Rings

Materials

Diamond, Ruby, Yellow Gold

18 Karat Ruby Ladies Ring
Located in Jackson Heights, NY
18K Yellow Gold Weight= 1.4gr Size= 5 1/2 Ruby= 0.18 Ct total Year= 1980
Category

Vintage 1980s American Art Deco Cluster Rings

Materials

Ruby, 18k Gold

14 Karat Vintage Ruby Ladies Ring
Located in Jackson Heights, NY
14k Yellow Gold Weight= 5.8 gr Size=5 Ruby= 3 ct total
Category

Vintage 1960s American Art Deco Cluster Rings

Materials

Ruby, 14k Gold

18 Karat Vintage Diamond and Ruby Ladies Necklace
Located in Jackson Heights, NY
18K Yellow Gold Weight= 15.9gr Length= 17 Inches Diamond= 1.50Ct total Ruby= 5 Ct total Year
Category

Vintage 1980s American Art Deco Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold

8.2 Carat Sapphire, 4.5 Carat Emerald, Ruby Diamond Vintage Dress Clip Brooch
Located in Berlin, Berlin
. 8.20 ct altogether 4 emeralds, front in star cut, back in step cut, approx. 4.55 ct altogether 5 rubies
Category

1990s Unknown Revival Brooches

Materials

Diamond, Emerald, Ruby, Blue Sapphire, Sapphire, 18k Gold, Yellow Gold

Sapphire Oval Bracelet 8.96 CTS
Located in New York, NY
Ruby Weight: 8.96 CT, Ruby Measurements: 5 x 7 mm, Diamond Weight: 0.73 CT, Metal: 18K White Gold
Category

21st Century and Contemporary Sri Lankan Modern Bracelets

Materials

Sapphire, 18k Gold

Natural 12 Ct Burma Ruby and 5 Ct Diamond Necklace 18 Karat Yellow Gold 166gm
Located in New York, NY
Natural 12 Ct Burma Ruby and 5 ct Diamond Necklace 18 Karat Yellow Gold 166gm This Necklace made
Category

Early 2000s Choker Necklaces

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

Oval Cut Treated Rubies 5 Ct 14 Karat Yellow Gold Flower Cocktail Ring
Located in New York, NY
Oval Cut Treated Rubies 5 Ct 14 Karat Yellow Gold Flower Cocktail Ring, Size 6 Theses rubies are
Category

2010s Solitaire Rings

Materials

Ruby, 14k Gold, Yellow Gold

GRS 5 Ct Burmese No Heat 'Pigeon Blood' Ruby and Diamond Earring in 18K Gold
Located in Bangkok, TH
An elegant pair of vivid and lustrous pigeon blood Burmese ruby and diamond chandelier earrings
Category

2010s Chandelier Earrings

Materials

Diamond, Ruby, 18k Gold, White Gold

5.5 Carat Ruby and 5 Carat Diamond Hanging or Chandelier Earrings 18 Karat Gold
Located in New York, NY
5.5 Carats of two Ruby and 5 Ct Diamond Hanging Earrings 18 K Yellow Gold This exquisite pair
Category

Early 2000s Dangle Earrings

Materials

Diamond, Ruby, 18k Gold

Pearls, Rubies, Diamonds, 14 Kt Rose Gold Earrings.
Located in Marcianise, Marcianise (CE)
structure mounted with a diamond and a ruby in the upper part; as pendant, a pearl. Diamonds 0.05 ct Rubies
Category

2010s Italian Retro Dangle Earrings

Materials

Diamond, Pearl, Ruby, 10k Gold, 14k Gold, Rose Gold

18 Karat White Gold Diamond Medium Ruby Flower Earring Ring Set
Located in Los Angeles, CA
inches / Width: 0.59 inches Ring: 42 Round Diamonds = 0.55 ct 5 Ruby Stones = 2.10 ct Length: 0.59
Category

2010s American Stud Earrings

Materials

Diamond, White Diamond, Ruby, 18k Gold, White Gold

MOISEIKIN 18K White Gold Ruby Akoya Pearl Flower Necklace, Promotion
By MOISEIKIN
Located in Hong Kong, HK
18 K,Weight 3.12 g,Size 41cm, 1 Pearl Akoya sea,7-7.5mm - 0.52 g 1 Diamond 0.01 ct 5 Ruby 0.33 ct
Category

2010s Russian Contemporary Pendant Necklaces

Materials

Diamond, Cultured Pearl, Ruby, Pearl, 18k Gold, White Gold

Antique Victorian 18K Gold Burma Ruby Diamond Cluster Engagement Ring - GIA
Located in Great Neck, NY
#R1990 Metal: 18K Yellow Gold Weight: 2.7 Grams  Size: 5 3/4 Ruby: .76 ct -Burma / NO HEAT - GIA
Category

Antique 1890s Victorian Cluster Rings

Materials

Diamond, Ruby, Gold, 18k Gold, Yellow Gold

Princess Cut Natural Ruby and 2.5 Carat Diamond Flower Bracelet in 18 Karat Gold
Located in New York, NY
40 princess cut rubies Totaling Approximately 5 ct. The rubies are set in horizontal rows of 4
Category

2010s Tennis Bracelets

Materials

Diamond, Ruby, Gold, 18k Gold

18 Karat Hite and Yellow Gold Bracelet, Set with Ruby and Diamonds Germany, 1970
Located in Heerlen, NL
One (1) 18K. White & Yellow Gold Braclet, Solid, Lock is Clip-lock set with 5 Ruby = 0.50 ct
Category

Late 20th Century Italian Modern Modern Bracelets

Materials

Diamond, Ruby, 18k Gold, White Gold, Yellow Gold

Rubin Giant in 18 Karat Gold
Located in Bad Kissingen, DE
18 k white gold hallmarked with fineness 750 5 rubies together 0,38 ct diamonds together 0,12 ct
Category

21st Century and Contemporary German Pendant Necklaces

Materials

Ruby, Gold

Rubin Giant in 18 Karat Gold
Rubin Giant in 18 Karat Gold
W 0.91 in L 1.19 in
Lovely Ruby Brilliant Ring 5 Hearts 1.20 ct and 0.40 ct beautiful Quality
Located in Viena, Viena
each heart for a special occasion or just beautiful to look at 5 raspberry colored ruby hearts
Category

2010s European Modern Band Rings

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

Van Cleef & Arpels Retro Ruby Diamond Gold Ring
By Van Cleef & Arpels
Located in New York, NY
approx. 2.50 cts - 5 round rubies approx. 0.65 ct. - Signed Van Cleef & Arpels - Numbered 73627 - Size 8
Category

Vintage 1940s French Retro Engagement Rings

Materials

Diamond, Ruby, Gold, 18k Gold, Yellow Gold

12 Mm Grey Pearls, Rubies, Diamonds, 14 Karat Rose Gold Earrings.
Located in Marcianise, Marcianise (CE)
structure mounted with a diamond and a ruby in the upper part; as pendant, a grey pearl. Diamonds 0.05 ct
Category

2010s Italian Retro Dangle Earrings

Materials

Diamond, Pearl, Ruby, 14k Gold, Rose Gold

Bulgari 18 Karat Yellow Gold Sapphire Emerald Cabochon Ruby Link Necklace
By Bulgari
Located in New York, NY
Total Ruby Weight: 5 CT Approx Type: Link Item Weight: 61.9 grams Length: 7.7 inch
Category

20th Century Italian More Necklaces

Elegant ruby earrings
By Valérie Danenberg
Located in New York, NY
A pair of 18 K white gold drop earrings set with 5 ct of pave rubies, 30 briolettes and two 0,50 ct
Category

Asian Drop Earrings

Materials

Ruby, 18k Gold

Elegant ruby earrings
Elegant ruby earrings
H NaN in W NaN in
White Gold Yellow Gold Diamonds Round Rubies Pear Cut Ruby Long Earring "Ribbon"
Located in Moscow, RU
, 0,34 ct 5 pear cut diamonds, 0,72 ct 5 round rubies 0,11 ct 7 pear cut ruby, 1,12 ct, pigeon blood
Category

2010s Russian Contemporary Drop Earrings

Materials

Diamond, Ruby, 18k Gold

Ruby and Diamond Vatican Charm/Pendant
Located in Dallas, TX
. Set with 9 round diamonds 0.09 ct. total weight and 5 round cut rubies 0.05 ct. total weight. Signed
Category

Late 20th Century Unknown Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold

Pink Tourmaline Peridot Cabochon Ruby Gold Cocktail Ring
Located in New York, NY
18Kt Yellow Gold Large Cocktail Ring, Designed With A 5 Ct Cabochon Ruby In The Center, Further
Category

Vintage 1960s American Cocktail Rings

Materials

Diamond, Peridot, Ruby, Tourmaline, 18k Gold

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5 Ct Ruby For Sale on 1stDibs

Find the exact 5 ct ruby you’re shopping for in the variety available on 1stDibs. Each design created in this style — which was crafted with great care and often made from Gold, 18k Gold and White Gold — can elevate any look. Find an antique version now, or shop for 249 vintage or 240 modern creation for a more contemporary example of these cherished accessories. You’re likely to find the perfect 5 ct ruby among the distinctive items we have available, which includes versions made as long ago as the 19th Century as well as those produced as recently as the 21st Century. For this particular accessory, there are many different carat weights to choose from, but .5 Carat and 1 Carat versions are of considerable interest. A 5 ct ruby from LB Exclusive, Cellini and David Jerome — each of whom created a beautiful version of this treasured accessory — is worth considering. A round cut version of this piece has appeal, but there are also oval cut and cushion cut versions for sale. Most of our 5 ct ruby for sale are for women, but there are 143 pieces available to browse for men.

How Much is a 5 Ct Ruby?

The price for a 5 ct ruby starts at $144 and tops out at $960,000 with these rings, on average, selling for $5,419.

Why Gold Shines in Jewelry Craftsmanship

Gold is the feel-good metal, the serotonin of jewelry. Wear vintage and antique gold necklaces, watches, gold bracelets or gold rings and you feel happy, you feel dressed, you feel, well, yourself. 

Gold, especially yellow gold, with its rich patina and ancient pedigree going back thousands of years, is the steady standby, the well-mannered metal of choice. Any discussion of this lustrous metal comes down to a basic truth: Gold is elementary, my dear. Gold jewelry that couples the mystique of the metal with superb design and craftsmanship achieves the status of an enduring classic. Many luxury houses have given us some of our most treasured and lasting examples of gold jewelry over the years.

Since its founding, in 1837, Tiffany & Co. has built its reputation on its company jewelry as well as its coterie of boutique designers, which has included Jean Schlumberger, Donald Claflin, Angela Cummings and Elsa Peretti. There are numerous gold Tiffany classics worth citing. Some are accented with gemstones, but all stand out for their design and the workmanship displayed.

For the woman who prefers a minimalist look, the Tiffany & Co. twist bangle (thin, slightly ovoid) is stylishly simple. For Cummings devotees, signature pieces feature hard stone inlay, such as her pairs of gold ear clips inlaid with black jade (a play on the classic Chanel black and tan), or bangles whose design recalls ocean waves, with undulating lines of lapis lazuli and mother-of-pearl. And just about any design by the great Jean Schlumberger is by definition a classic.

Even had he eschewed stones and diamonds, Southern-born David Webb would be hailed for the vast arsenal of heavy gold jewelry he designed. Gold, usually hammered or textured in some manner, defines great David Webb jewelry. The self-taught jeweler made very au courant pieces while drawing inspiration from ancient and out-of-the-way sources — East meets West in the commanding gold necklaces made by Webb in the early 1970s. The same could be said for his endlessly varied gold cuffs.

In Europe, many houses have given us gold jewelry that sets the highest standard for excellence, pieces that were highly sought after when they were made and continue to be so. 

Numerous designs from Cartier are homages to gold. There are the classic Trinity rings, necklaces and bracelets — trifectas of yellow, white and rose gold. As a testament to the power of love, consider the endurance of the Cartier Love bracelet.

Aldo Cipullo, Cartier’s top in-house designer from the late 1960s into the early ’70s, made history in 1969 with the Love bracelet. Cipullo frequently said that the Love bracelet was born of a sleepless night contemplating a love affair gone wrong and his realization that “the only remnants he possessed of the romance were memories.” He distilled the urge to keep a loved one close into a slim 18-karat gold bangle. 

BVLGARI and its coin jewelry, gemme nummarie, hit the jackpot when the line launched in the 1960s. The line has been perennially popular. BVLGARI coin jewelry features ancient Greek and Roman coins embedded in striking gold mounts, usually hung on thick link necklaces of varying lengths. In the 1970s, BVLGARI introduced the Tubogas line, most often made in yellow gold. The Tubogas watches are classics, and then there is the Serpenti, the house's outstanding snake-themed watches and bracelets.

A collection called Monete that incorporated the gold coins is one of several iconic BVLGARI lines that debuted in the 1970s and ’80s, catering to a new generation of empowered women. Just as designers like Halston and Yves Saint Laurent were popularizing fuss-free ready-to-wear fashion for women on the go, BVLGARI offered jewels to be lived in

Since Van Cleef & Arpels opened its Place Vendôme doors in 1906, collection after collection of jewelry classics have enchanted the public. As predominantly expressed in a honeycomb of gold, there is the Ludo watch and accessories, circa the 1920s, and the golden Zip necklace, 1951, whose ingenious transformation of the traditional zipper was originally proposed by the Duchess of Windsor. Van Cleef's Alhambra, with its Moroccan motif, was introduced in 1968 and from the start its popularity pivoted on royalty and celebrity status. It remains one of VCA’s most popular and collected styles.

Mention must be made of Buccellati, whose name is synonymous with gold so finely spun that it suggests tapestry. The house’s many gold bracelets, typically embellished with a few or many diamonds, signified taste and distinction and are always in favor on the secondary market. Other important mid-20th-century houses known for their gold-themed jewelry include Hermès and Ilias Lalaounis.

Find a stunning collection of vintage and antique gold jewelry on 1stDibs.

The Legacy of Ruby in Jewelry Design

This deep red gem is the color of heat and passion — vintage and antique ruby jewelry is perfect for those born in the middle of summer.

Rubies are one of the few gemstones that can give diamonds a run for their money. Just consider the Van Cleef & Arpels “scarf” necklace the Duke of Windsor presented to the Duchess on her 40th birthday, in 1936 — set with diamonds and dripping with rubies, a testament to the deep-red gemstone’s power — or the slippers encrusted with 4,600 rubies that Harry Winston made to commemorate The Wizard of Oz’s golden anniversary. July babies have permission to adorn themselves with this beautiful red stone even when it’s not their birthday.

Rubies are considered precious stones — along with diamonds, sapphires and emeralds — and have a hardness of 9.0 on the Mohs Scale, surpassed only by Moissanite and diamonds. They are composed of corundum, a colorless mineral that is also the basic material of sapphires. In the July birthstone, the red of the gemstone — and the various hues seen in sapphires — are produced by the presence of trace elements. In the case of a ruby, this element is chromium. Rubies range in color from vermilion to a violet red. They are also pleochroic, which means that a stone’s hue can vary depending on the direction of viewing. The most sought-after color is pigeon’s blood: pure red with a hint of blue.

Rubies that are hosted in dolomite marble are the most prized: Because the marble is low in iron, so are the rubies, resulting in a more intense color. Rubies found in basalt, which has a higher iron content, are generally darker and less intense.

When shopping for antique and vintage ruby jewelry, remember that the 4Cs of selecting the perfect diamond — color, clarity, cut and carat — also apply to rubies.

According to the Gemological Institute of America, the color of the July birthstone should be a vibrant to slightly purplish red, and the stone should be clear and inclusion-free. Accordingly, the cut should show off its color and clarity. As for the last criterion, fine rubies more than a carat in weight are rare. Often, large rubies are more expensive than diamonds of comparable weights.

Find a collection of ruby necklaces, ruby rings and other accessories on 1stDibs.