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Ruby Jewelry

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Item Ships From: USA
Gemstone: Ruby
Bochic “Orient” Ruby, Rose Sapphires & Pearl Earrings Set In 18K Gold & Silver
Located in New York, NY
Bochic “Orient” Ruby, Rose Sapphires & Pearl Earrings Set In 18K Gold & Silver South Sea Baroque Pearls, Gray / Silver Color with Pink Tones Multi Color Natural Rose Cut Sapphires ...
Category

21st Century and Contemporary Thai Baroque Ruby Jewelry

Materials

Pearl, Ruby, Sapphire, Blue Sapphire, Pink Sapphire, Yellow Sapphire, Gr...

14K Gold, 3.50 Carat Diamond & Ruby Cocktail Ring
Located in Miami, FL
Crafted from luxurious 14K yellow gold, this captivating cocktail ring features a vibrant 1.50 carat natural round-cut Burma ruby, exuding rich allure. Surrounding the ruby are dazzl...
Category

21st Century and Contemporary European Art Nouveau Ruby Jewelry

Materials

Diamond, Ruby, Gold, 14k Gold, Yellow Gold

14K 11.35ctw Ruby Tennis Bracelet 14K Yellow Gold Featuring 11.35 Carat Pear
Located in Holtsville, NY
Experience the elegance and luxury of this stunning 14K Yellow Gold Tennis Bracelet, featuring 11.35 carats of beautiful pear modified brilliant rubies. Perfect for special occasions...
Category

2010s American Artist Ruby Jewelry

Materials

Ruby, 14k Gold, Yellow Gold

White Gold Ruby Inside-Out Half-Hoop Earrings - 14k Round 3.04ctw Pierced
Located in Greensboro, NC
Metal Content: 14k White Gold Stone Information Natural Rubies Treatment: Heating Carat(s): 3.04ctw Cut: Round Color: Pinkish Red Total Carats: 3.04ctw Style: Inside-Out Half-Hoo...
Category

21st Century and Contemporary Ruby Jewelry

Materials

Ruby, 14k Gold, White Gold

Important Antique Marquise Ruby and Diamond Bracelet 12 Carats
Located in Laguna Niguel, CA
It comes with the Gemological Appraisal by GIA GG/AJP All Gemstones are Natural Rubies = 5.28 Carats Cut: Marquise Diamonds = 6.82 Carats Color: F-H, Clarity: VVS-SI Metal: 14K White...
Category

Mid-20th Century Art Deco Ruby Jewelry

Materials

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

14K Ruby & Diamond Floral Drop Earrings 14K Yellow Gold 0.47 ct
Located in Holtsville, NY
Enhance your elegance with these stunning 14K Yellow Gold Floral Drop Earrings, featuring vibrant rubies and sparkling diamonds. Perfect for special occasions or adding a touch of lu...
Category

2010s American Artist Ruby Jewelry

Materials

Diamond, Ruby, 14k Gold, Yellow Gold

14K Ruby & Diamond Pendant Necklace Ruby 0.34ct & Diamond 0.12ct
Located in Holtsville, NY
Elevate your jewelry collection with this stunning 14K ruby and diamond pendant necklace. Expertly crafted with 14K yellow gold and 18K yellow gold accents, this exquisite piece feat...
Category

2010s American Artist Ruby Jewelry

Materials

Diamond, Ruby, 14k Gold

Vintage Art Deco Diamond Ruby Ring 18k Yellow Gold Platinum Small Square Sz 6
Located in Torrance, CA
Finely detailed vintage Art Deco era diamond & ruby ring crafted in 18k yellow gold and 900 platinum (circa 1920s to 1930s). One small 2.5mm ruby adorns the center, accented with ...
Category

Early 20th Century Unknown Art Deco Ruby Jewelry

Materials

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

BUCCELLATI Aquamarine Diamond Ruby 18k Yellow Gold Ring
Located in New York, NY
This exquisite vintage Gianmaria Buccellati cocktail ring is crafted in 18k brushed and textured yellow gold with white gold accents. This ring is set with a faceted oval 7.0mm x 10....
Category

1990s Ruby Jewelry

Materials

Aquamarine, Diamond, Ruby, Yellow Gold

14K 5.74ct Ruby & Diamond Cocktail Ring Size 6.75 Diamond 0.06ct & Ruby 5.74ct
Located in Holtsville, NY
Presenting a luxurious 14K yellow gold cocktail ring, featuring a stunning 5.74 carat oval cabochon ruby, accentuated by sparkling diamonds. This exquisite piece combines timeless el...
Category

2010s American Artist Ruby Jewelry

Materials

Diamond, Ruby, 14k Gold

Bochic “Orient” Ruby & South Sea Pearl Earrings Set In 18K Gold & Silver
Located in New York, NY
Bochic “Orient” Ruby & South Sea Pearl Earrings Set In 18K Gold & Silver Natural Oval Shapes Rubies 6 carats Multi Color Sapphires from Sri Lanka 0.55 carats South Sea Baroque ...
Category

21st Century and Contemporary Thai Baroque Ruby Jewelry

Materials

Blue Sapphire, Yellow Sapphire, Pink Sapphire, Ruby, South Sea Pearl, Si...

Stambolian 18K Yellow White Gold Diamonds Pink Sapphire and Ruby Flower Ring
Located in Boca Raton, FL
Stambolian 18K Yellow White Gold Diamonds Pink Sapphire and Ruby Flower Ring This stunning flower ring from the Stambolian "Enchanted Garden" collection is crafted in solid 18k gold...
Category

21st Century and Contemporary American Modern Ruby Jewelry

Materials

Pink Sapphire, Ruby, White Diamond, Diamond, Yellow Gold, White Gold, 18...

Aletto Brothers Invisibly-Set Ruby Diamond Earrings
Located in Palm Beach, FL
Aletto Brothers domed clip earrings handcrafted in platinum, featuring invisibly-set step-cut natural rubies weighing 40 total carats, surrounded by bezel-set round brilliant-cut dia...
Category

21st Century and Contemporary American Ruby Jewelry

Materials

Diamond, Ruby, Platinum

TIFFANY & Co. Platinum 3mm Half Circle Diamond Ruby Band Ring 4
Located in Los Angeles, CA
TIFFANY & Co. Platinum 3mm Half Circle Diamond Ruby Band Ring 4 Metal: Platinum Size: 4 Band Width: 3mm Diamond: 4 round brilliant diamonds, total carat weight .18 Ruby: 5 round ...
Category

2010s American Ruby Jewelry

Materials

Diamond, Ruby, Platinum

14 Karat Yellow Gold Ruby and Diamond Ring Size 6 #17427
Located in Washington Depot, CT
14 Karat Yellow Gold Ruby and Diamond Ring Size 6 This lovely ring features three marquis cut natural rubies (6 mm x 3 mm) and eight round brilliant cut diamonds set in classic 14K ...
Category

21st Century and Contemporary Ruby Jewelry

Materials

Diamond, Ruby, 14k Gold, Yellow Gold

Edwardian Ruby Diamond Yellow Gold Ring
Located in Mount Kisco, NY
Three vibrant rose cut rubies are the feature of this fine Edwardian period eighteen karat 18k yellow gold ring. It's beautiful antique setting includes four .01 carat diamonds accen...
Category

Early 1900s British Edwardian Antique Ruby Jewelry

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

Platinum Ruby & Diamond Ring - Round 1.92ctw
Located in Greensboro, NC
Size: Please contact us for sizing information. Metal Content: Platinum Stone Information Natural Ruby Treatment: Heating Carat(s): 1.54ct Cut: Round Color: Pinkish Red Natural D...
Category

21st Century and Contemporary Ruby Jewelry

Materials

Diamond, Ruby, Platinum

Beautiful Ruby Claddagh Ring in Solid 10K Yellow Gold Traditional Irish Ring
Located in Columbus, OH
This beautiful claddagh ring features a 0.47 carat ruby gemstone set in solid 10K gold. A Claddagh ring is a traditional Irish ring in which a heart represents love, the crown stands...
Category

2010s American Modern Ruby Jewelry

Materials

Ruby, Gold, 10k Gold, Yellow Gold

2ct Ruby Pendant w Earth Mined Diamonds in Solid 14k Yellow Gold Oval 9x7mm
Located in Columbus, OH
This beautiful pendant features a 1.94 carat oval ruby gemstone with natural earth mined diamonds in solid 14k gold. This pendant can be a lovely July birthstone gift for your loved ...
Category

2010s American Modern Ruby Jewelry

Materials

Diamond, White Diamond, Ruby, Gold, 14k Gold, Yellow Gold

5.20 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

2.01 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

2.44 Ct Ruby Pear Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

2.04 Ct Ruby Pear Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

2.45 Ct Ruby Pear Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

1.91 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

5.71 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

5.18 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

4.61 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

2.77 Ct Ruby Pear Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

2.20 Ct Ruby Pear Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

2.15 Ct Ruby Pear Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

1.98 Ct Ruby Pear Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

5.57 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

Charles Krypell Diamond and Ruby Open Heart Necklace Set in 18 Karat Yellow Gold
Located in Scottsdale, AZ
This Charles Krypell ruby and diamond open heart necklace is meticulously crafted in 18 karat yellow gold. Adorned with a striking contrast of rubies along the heart pendant's edge a...
Category

21st Century and Contemporary Unknown Contemporary Ruby Jewelry

Materials

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

Herbert Rosenthal Bee Brooch Natural Ruby 18K Yellow Gold
Located in Pittsburgh, PA
This charming bee pin by Herbert Rosenthal features intricate detail, crafted in 18k yellow gold with round natural rubies for eyes. The exquisite design displays high quality workma...
Category

Late 20th Century American Ruby Jewelry

Materials

Ruby, Gold, 18k Gold, Yellow Gold

Bochic “Orient” Ruby, Sapphire & South Sea Earrings Set In 18K Gold & Silver
Located in New York, NY
Bochic “Orient” Ruby, Sapphire & South Sea Earrings Set In 18K Gold & Silver Natural Red Ruby - 8 Carats Oval Shapes Natural Multi Color Sapphires From Sri Lanka - 1 Carats Round ...
Category

21st Century and Contemporary Thai Baroque Ruby Jewelry

Materials

South Sea Pearl, Ruby, Sapphire, 18k Gold, Gold Plate, Silver

Ruby Stud Earrings w Earth Mined Diamonds in Solid 14K Yellow Gold Oval 7x5mm
Located in Columbus, OH
These cute stud earrings feature a pair of 1.77 carat weight oval ruby gemstones with natural earth mined diamonds, all set in solid 14K gold. These earrings can be a beautiful July ...
Category

2010s American Modern Ruby Jewelry

Materials

Diamond, White Diamond, Ruby, Gold, 14k Gold, Yellow Gold

Emerald Ruby Diamond Yellow Gold Bypass Ring
Located in Beverly Hills, CA
Center Stone: Emerald Cut: Square emerald Weight: 0.80 carats approximately Center Stone: Ruby Cut: Square Emerald Weight: 0.50 carats Accent Stone: 8 diamonds Cut: Emerald Weigh...
Category

1990s Ruby Jewelry

Materials

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

Stackable Ruby and Blue Sapphire Eternity Band Ring in 14k Solid White Gold
Located in Houston, TX
Stackable Ruby and Blue Sapphire Eternity Band Ring in 14K Gold featuring natural blue sapphire and ruby of 5.55 carats. The gorgeous handcrafted ring goes with every style. Sapphire...
Category

21st Century and Contemporary American Art Deco Ruby Jewelry

Materials

Ruby, Sapphire, Blue Sapphire, Gold, 14k Gold, White Gold

Natural Pink Ruby and Diamond Platinum Wedding Band 5 Stone Ring
Located in Miami, FL
Pink Ruby and Diamond Platinum 5 Stone Wedding Band Ring. This band ring features 5 oval-cut rubies. The rubies radiate a pinkish-red hue. Paired with the ruby stones are 16 additi...
Category

21st Century and Contemporary North American Modern Ruby Jewelry

Materials

Diamond, Ruby, Platinum

38.62 cts of Pink Opal Drop Earrings
Located in New York, NY
Introducing our exquisite Pink Opal Drop Earrings, a stunning blend of elegance and vibrant color. Each earring features a magnificent pink opal weighing 38.62 carats, exuding a soft...
Category

2010s Indian Modern Ruby Jewelry

Materials

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

Mid-Century 27.62 CTW Ruby Diamond Platinum Cluster Vintage Line Bracelet
Located in Philadelphia, PA
Designed as navette-shaped ruby clusters alternating with open circle and bar links Rubies are round and cushion cut and weigh approximately 23.36 carats total Well-matched transpa...
Category

1950s Vintage Ruby Jewelry

Materials

Diamond, Ruby, Platinum

Vintage Love Bird Sapphire Ruby Gold Pendant
Located in Beverly Hills, CA
Center Stone: 1 blue sapphire Cut: Round Weight: 0.10 carat approximately Accent Stone: 2 Rubies Cut: Round Weight: 0.08 carat approximately Metal: 14k yellow gold Era: Mid-Century...
Category

1960s Vintage Ruby Jewelry

Materials

Ruby, Sapphire, Gold, 14k Gold, Yellow Gold

Yellow Gold Ruby Halo Earring Enhancers - 14k Round .96ctw Round Stud Jackets
Located in Greensboro, NC
Metal Content: 14k Yellow Gold Stone Information Natural Rubies Treatment: Heating Carat(s): .96ctw Cut: Round Color: Pinkish Red Total Carats: .96ctw Style: Halo Earring Enhance...
Category

21st Century and Contemporary Ruby Jewelry

Materials

Ruby, 14k Gold, Yellow Gold

Ruby and White Diamond Stud Tension Back Earrings in Platinum
Located in Los Angeles, CA
Beautiful 1.12 ct. ruby ovals with 0.48 ct. good quality white diamond rounds. Handmade in platinum. These earrings have tension backs that allow them to be worn by both people who...
Category

21st Century and Contemporary Ruby Jewelry

Materials

White Diamond, Ruby, Platinum

Ruby Diamond Yellow Gold Ring
Located in Beverly Hills, CA
Center Stone: Ruby Cut: Round Weight: 0.85 carats approximately Accent Stone: 4 diamonds Cut: Round Brilliant Weight: 0.10 carats approximately Color: I-J Clarity: SI Metal: 18k y...
Category

1980s Vintage Ruby Jewelry

Materials

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

Exquisite 14k Yellow Gold Multi Gemstone Diamond Necklace
Located in New York, NY
Elevate your jewelry collection with this exquisite 14k yellow gold multi gemstone diamond necklace. The necklace showcases two captivating oval-shaped emeralds, two radiant rubies, ...
Category

21st Century and Contemporary Modern Ruby Jewelry

Materials

Diamond, Emerald, Ruby, Sapphire, 14k Gold, Yellow Gold

Antique Art Deco Platinum Tutti Frutti Moonstone Diamond Flower Pot Brooch
Located in Winter Springs, FL
One of the most desirable styles from one of the most desirable eras in jewelry manufacturing. This “tutti frutti” flower pot brooch is hand crafted in platinum and set with marquise...
Category

Early 20th Century Unknown Art Deco Ruby Jewelry

Materials

Diamond, Yellow Diamond, Emerald, Moonstone, Ruby, Blue Sapphire, Platinum

Gold Brooch Gold Byzantine Empire Histamenon Nomisma 1059-1067 A.D. Rubies
Located in New York, NY
This exquisite brooch/pin is a remarkable piece of jewelry crafted from luxurious 18k yellow gold. The top bar, designed in a tube-like shape adorned with elegant ridges, features tw...
Category

2010s American Ruby Jewelry

Materials

Ruby, Gold, 18k Gold

Oval Cut Ruby and Round Cut Diamond Band Ring 14K White Gold Size 6
Located in New York, NY
Magnificent Red Ruby and sparkling diamond band ring. Showcasing high brilliance, this ring is featured with oval cut red rubies weighing approximately 1.25 carats and accentuated by...
Category

2010s Modern Ruby Jewelry

Materials

Diamond, Ruby, 14k Gold, White Gold

Estate 18K Ruby Diamond Baguette Bypass Flower Cocktail Cluster Ring 5.22cttw
Located in Winter Springs, FL
This bold statement of a piece is crafted in 18K yellow gold and channel as well as prong set with approximately 2.50cttw in natural bright red rubies as well as 2.72cttw in G-I colo...
Category

Late 20th Century Contemporary Ruby Jewelry

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

1.43 Carat Pinkish Red Ruby and Diamond Cluster Platinum Dome Ring
Located in Miami, FL
Pinkish Red Ruby and Diamond Platinum Dome Ring. This dome shank ring is set in a platinum-crafted ring setting. The ring features five oval-cut rubies. The rubies radiate a pinkis...
Category

21st Century and Contemporary North American Baroque Ruby Jewelry

Materials

Diamond, Ruby, Platinum

GRS Certified 4.21 Carat BURMA NO HEAT Oval Ruby Diamond Ring
Located in Rome, IT
In this remarkable piece of jewelry, a truly breathtaking 4.21-carat oval-shaped ruby, exuding a vivid blood-red purple hue, certified by the esteemed GRS Switzerland, takes center s...
Category

2010s Unknown Contemporary Ruby Jewelry

Materials

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

Lion Cub Gemstone Gold brooch
Located in Beverly Hills, CA
Center Stone: 1 ruby Cut: Round Weight: 0.10 carat approximately Accent Stone: 2 Emeralds Cut: Round Weight: 0.20 carat approximately Accent Stone: 10 single cut diamonds Cut: S...
Category

1960s Vintage Ruby Jewelry

Materials

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

Austria 1925 Art Deco Curvex Wristwatch in Platinum With 7.75 Ctw in Gemstones
Located in Miami, FL
An art deco curvex wristwatch in platinum with gemstones. This is an absolutely gorgeous wristwatch, created in Austria during the art deco period, back in the late 1920's. The case...
Category

1920s Austrian Art Deco Vintage Ruby Jewelry

Materials

Blue Sapphire, Sapphire, Ruby, Emerald, White Diamond, Diamond, Platinum

Meghna Jewels Ruby Diamond 18 Karat Rose Gold Ring
Located in Hoffman Estate, IL
This exquisite ring is handcrafted in 18-karat gold. It is set in 1.33 carats ruby and .77 carats of sparkling diamonds. FOLLOW MEGHNA JEWELS storefront to view the latest collectio...
Category

21st Century and Contemporary Modern Ruby Jewelry

Materials

Diamond, Ruby, Gold, 18k Gold, Rose Gold

4.04 Ct Ruby Octagon Cut Loose Gemstone
Located in Fort Lee, NJ
An exquisite red color birthstone for July, believed to convey a status of power & wealth. Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose ...
Category

2010s Malagasy Ruby Jewelry

Materials

Ruby

Art Deco Ruby Ring 1.86 Carat Set with Diamonds 0.31 Carats 18k White Gold
Located in Laguna Niguel, CA
It comes with an appraisal by GIA G.G. Round Ruby = 1.86 Carats Total Carat Weight of Diamonds = 0.31 Carats Diamonds Color is F-H Diamonds Clarity is VVS-VS Metal is 18K White Gold ...
Category

Late 20th Century Art Deco Ruby Jewelry

Materials

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

Vintage and Antique Ruby Jewelry for Sale on 1stDibs

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.

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