1.17 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose gemstone & matching your gem with our ready selection of beautiful ring styles in th...
Ruby
2.14 Ct Ruby Oval Loose Gemstone
Located in Fort Lee, NJ
Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose gemstone & matching your gem with our ready selection of beautiful ring styles in th...
Ruby
3.55 Ct Ruby Oval Loose Gemstone
Located in Fort Lee, NJ
Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose gemstone & matching your gem with our ready selection of beautiful ring styles in th...
Ruby
3.00 Ct Ruby Oval Loose Gemstone
Located in Fort Lee, NJ
Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose gemstone & matching your gem with our ready selection of beautiful ring styles in th...
Ruby
1.04 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose gemstone & matching your gem with our ready selection of beautiful ring styles in th...
Ruby
1.04 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose gemstone & matching your gem with our ready selection of beautiful ring styles in th...
Ruby
1.03 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose gemstone & matching your gem with our ready selection of beautiful ring styles in th...
Ruby
0.99 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose gemstone & matching your gem with our ready selection of beautiful ring styles in th...
Ruby
1.00 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose gemstone & matching your gem with our ready selection of beautiful ring styles in th...
Ruby
1.02 Ct Ruby Round Loose Gemstone
Located in Fort Lee, NJ
Explore vibrant collection of Emerald, Ruby & Sapphires in our store available as a loose gemstone & matching your gem with our ready selection of beautiful ring styles in th...
Ruby
Bypass Ruby & Diamond Ring in 900 Platinum
Located in Bloomington, MN
Bypass Ruby & Diamond Ring in 900 Platinum This ring is crafted in 900 platinum and features red rubies in a sculptural bypass design. The rubies total approximately 1.5 carats and ...
Diamond, Ruby, Platinum
Burmese Ruby & Diamond Cocktail Ring
Located in New York, NY
Burmese Ruby & Diamond Cocktail Ring Description: This extraordinary ring is a true celebration of color and brilliance, featuring a captivating 5.19-carat Burmese ruby at its c...
Diamond, Ruby, White Diamond, Gold, 18k Gold, Yellow Gold
Emerald, Ruby, Sapphire and Diamond Floral Bouquet Brooch, 18k
Located in New York, NY
An Emerald, Ruby, Sapphire and Diamond Floral Bouquet Brooch made in 18k yellow gold. The dimensions are 1.50 x 1.25 inch. The total weight of the brooch is 11.20 grams.
Diamond, Emerald, Ruby, Sapphire
14K Gold Retro Synthetic Ruby Ring
Located in Venice, CA
What we love about this 14k gold retro ring is its streamline form: the oval synthetic ruby has a curved surface that allows it to flow perfectly into the silhouette of the band. The...
Ruby, Gold, 14k Gold
Antique Ruby and Diamond Cluster Ring
Located in London, GB
Here we have a gorgeous little antique cluster ring. At its heart lies a chunky old mine-cut diamond. This bright white principal stone sits slightly risen whilst being encircled by ...
Diamond, Ruby, 18k Gold, Yellow Gold
Ruby Ring Ruby 6.8 Carat in 18 Carat White Gold Triangle Diamonds
Located in Paris, FR
18K White Gold Ruby Ring and Diamonds 18K white gold ring set with a large composite ruby of 6.80 Carats set with 4 double claws supported on either side by a Triangle-shaped diamo...
Diamond, Ruby, 18k Gold, White Gold
Natural Diamond Rubellite Ring 14K Gold Vintage Estate
By Estate Jewelry
Located in East Brunswick, NJ
Diamond Rubellite Ring 14K Gold Vintage Estate This lovely estate ring is finely crafted in solid 14K Yellow Gold and set with natural Earth mined Rubellite and diamonds. The cente...
Diamond, Ruby, 14k Gold, Yellow Gold
Fancy Colored Diamond Ruby Gold Rooster Brooch
Located in Beverly Hills, CA
A proud and beautiful rooster! It features 3.23 carats of fancy-colored diamonds, which include yellows and cognac colors. Its mesmerizing eye is made of a single cabochon ruby. The ...
Diamond, Ruby, Gold, 18k Gold, Rhodium
Italian 18 Karat Gold Diamond and Ruby Honeycomb Ring Approx 2ct dia. 1ct rubies
Located in Plantation, FL
A bold and architecturally striking ring, crafted in 18 karat gold and designed in an elegant honeycomb motif, pavé-set throughout with fine white diamonds and vivid natural rubies. ...
Diamond, Ruby, Gold
Ruby Flower Ring with Marquise Cut Ruby Set in 14k Solid White Gold
By VR Jewels
Located in New York, NY
Ruby Flower Ring with Marquise Cut Ruby Set in 14K Gold featuring natural ruby of 0.77 carats.
Ruby, Gold, 14k Gold, White Gold
$5,867 / set
Moi Mila Ruby Stackable-Ring
Located in Lawrenceville, GA
Gold(14K) : 11.60g Emerald (Princess-cut) : 4.10ct Yellow Sapphire (Brilliant-cut) : 2.50ct Color being the heart of the design here, these beautifully handcrafted rings are worked ...
Ruby, 14k Gold
Ruby & Pave Diamond Bavna Drop Earrings
Located in New York, NY
Product Details: Ruby and pave diamond drop pierced earrings by Bavna. 0.75" width, 1.6" length.
Diamond, Ruby
1.50 Carat Ruby Engagement Ring. Oval Ruby Old Mine Diamond Halo Ring Platinum
Located in New York, NY
Other Details: Primary Stone: Ruby Center Ruby Weight: 1.50 Carats Center Ruby Cut: Oval Cut Secondary Stones: Diamonds Diamond Weight: Approximately 0.50 Carats Diamond Cut: Old M...
Diamond, Ruby, Gold, Yellow Gold, Platinum, 18k Gold
Ornate Ruby & Diamond Milgrain Ring in Platinum
Located in Bloomington, MN
Ornate Ruby & Diamond Milgrain Ring in Platinum This ring is crafted in 900 platinum and features a 0.55ct red ruby set at the center of a wide, detailed band. The ruby brings a viv...
Diamond, Ruby, Platinum
Ruby Diamond Gold Pendant
Located in Beverly Hills, CA
A fine pendant featuring a 1.18 carat pear-shape ruby! It has a rich vivid red color and is shaped beautifully in terms of the stones proportions and cut. It is accented by 0.29 cara...
Diamond, Ruby, Gold, 18k Gold, White Gold
Ruby Diamond cocktail earrings 18KT gold
Located in Boca Raton, FL
32 grams 18KT chandelier earrings with large rubies and diamonds, stunning on ears! Rubies are 100% natural and untreated.
Diamond, Ruby, Gold, 18k Gold
GIA Burma Ruby & Diamond Ring
Located in San Francisco, CA
A beautiful update on a classic Art Deco design, this 18k gold ring centers an oval-shaped Burmese ruby weighing 1.04 carats, with well saturated, deep red color, surrounded by spark...
Diamond, Ruby, 18k Gold
Ruby Ring Ruby 6.4 Carat in 18 Carat White Gold and Diamonds
Located in Paris, FR
Ring 6.4 carat ruby in 18 carat white gold with diamonds 18-carat white gold ring set in its center with a large claw-set ruby weighing 6.4 carats, flanked on either side by two ba...
Diamond, Ruby, 18k Gold, White Gold
Ruby Diamond Platinum Heart Ring
Located in Beverly Hills, CA
A stylish ring resembling a heart featuring fine quality gems. The cushion shaped ruby weighs 1.66 carats and has a pure vivid red color. A true gem of a ruby. It is accented by 1.73...
Diamond, Ruby, Platinum
18K Diamond and Ruby Bracelet
Located in New York, NY
Indulge in the ultimate luxury with our 18k Diamond and Ruby Bracelet. Crafted from 18k white gold and adorned with 3.85 carats of dazzling diamonds and 4.54 carats of radiant rubies...
Diamond, Ruby, Gold, 18k Gold, White Gold
Tiffany & Co. Ruby Diamond 18K Yellow Gold Bee Brooch
By Tiffany & Co.
Located in 台東区, JP
A whimsical yet elegant example of Tiffany & Co. animal-inspired jewelry, this brooch combines fine craftsmanship with a playful naturalistic motif.
Diamond, Ruby, 18k Gold, Yellow Gold
6.68 Carat Round Diamond Ruby Gold Earrings
By EstatebyJR
Located in New York, NY
This striking pair of earrings pairs the fire of white diamonds with the depth of natural red rubies for a bold, high-contrast look. Each earring is centered on a round white diamond...
Diamond, Ruby, Gold
Elephant-Shaped 18k Gold Emerald Ruby Diamond Brooch, India, New
Located in jaipur, IN
GW=20.51gm NW=18.36gm Diamond Round =0.70cts Diamond Rosecut =0.30cts Ruby oval=3.00cts Ruby pears=1.23cts Emerald round =4.92cts Diamond polki=0.62cts An exquisite elephant-shaped ...
Diamond, Emerald, Ruby, 18k Gold
18K White Gold Ruby & Diamond Cocktail Ring – 0.35 ct Ruby, 26 Pavé Diamonds
Located in MONTMORENCY, FR
Crafted in the classic cocktail style, this fine jewelry ring boasts a modern yet timeless aesthetic, marrying vibrant red ruby sparkle with the icy brilliance of G-H color, VS clari...
Diamond, Ruby, 18k Gold, White Gold
Ruby with Cabochon Ruby and Diamond Necklace Set in 18 Karat Gold Settings
Located in Bangkok, TH
Ruby 38.22 carats with Cabochon Ruby 46.05 carats and Diamond 3.04 carats Necklace set in 18 Karat Gold Settings Width: 1.8 cm Length: 43.0cm Total Weight: 140.3 grams "We first ...
Diamond, Ruby, Gold, 18k Gold
Platinum Brooch with 3.95 Carat Diamonds and 1.10 Carat Rubies
Located in Warszawa, PL
Platinum brooch with diamonds and rubies, 3.95 carats diamonds, 1.10 carats rubies.
Diamond, Ruby, Platinum
Ruby Flower Pendant 3.66 Carats Sterling Silver
Located in Bonita Springs, FL
Comes with Gemological Appraisal by GIA GG/AJP All Gemstones are Natural in Origin Ruby: 3.66 Carats (Treatment: Filling) Metal: Sterling Silver Dimensions: 37 x 23 mm
Ruby, Silver, Sterling Silver
Certified Natural Unheated Burmese Ruby Necklace
Located in New York, NY
Certified Natural Unheated Burmese Ruby Necklace A five-strand ruby bead necklace with an Indian made enameled clasp adorned with rose cut diamonds. Accompanied by a GIA certificat...
Ruby, 18k Gold
Ruby with Ruby and Diamond Ring Set in 18 Karat Rose Gold Settings
Located in Bangkok, TH
Ruby 2.0 carats with Ruby 4.63 carats and Diamond 1.29 carats Ring set in 18 Karat Rose Gold Settings Width: 1.8 cm Length: 3.0 cm Ring Size: 55 "Since we first opened doors in 1...
Diamond, Ruby, 18k Gold, Rose Gold
Bristol 14k Gold Ruby Eternity Ring
Located in Great Neck Plaza, NY
The refined Ruby Eternity Band is a stunning piece of jewelry featuring a captivating 1.0 ct baguette-cut ruby in vivid red.
Ruby, 14k Gold, White Gold, Yellow Gold
19th Century French Tri Color Gold Ruby Brooch
Located in New York, NY
French Tri Color Gold Ruby Brooch set in 18k gold from the 19th Century, Originally a cover for a fancy pocket watch, this was converted in the period into a brooch with bale for pen...
Ruby, 18k Gold
$6,320Sale Price|20% Off
Fancy Cut Diamond, Sapphire and Ruby Vintage Brooch
Located in Aspen, CO
The 26 natural vivid red rubies (probably from Burma), weigh an estimated 1.45 cts.
Diamond, Ruby, Blue Sapphire
Vintage Ruby and Diamond Drop Earrings
Located in London, GB
Here we have a delightful pair of drop earrings featuring vibrant red rubies and bright white brilliant cut diamonds. Each earring has been crafted from 18ct yellow gold with the rub...
Diamond, Ruby, 18k Gold, Yellow Gold
Art Deco Platinum Diamond Ruby Bracelet
Located in New York, NY
A most wearable piece of period jewelry. Length 7 inches
Diamond, Ruby, Platinum
Vintage Ruby Enamel Ladies Face Brooch in 18k Yellow Gold
Located in Jesmond, Newcastle Upon Tyne
An impressive vintage 0.02 carat ruby and blue enamel, 18 karat yellow gold brooch; part of our diverse vintage estate jewelry collections.
Ruby, 18k Gold, Yellow Gold, Enamel
Bloom Ruby and Diamond Stud Earrings in 18K Gold, 3.71ct Ruby
By Meghna Jewels
Located in Hoffman Estate, IL
These earrings are meticulously crafted in 18-karat gold. It is hand set in 3.71 carats ruby and .41 carats of diamonds. Also available Bloom ring to compliment with these earrings....
Diamond, Ruby, Gold, 18k Gold, Yellow Gold
12ct Natural Ruby Diamonds Bracelet 14kt*
Located in New York, NY
Ruby & Classic Alternating Tennis. 10ct. Natural ruby bracelet. Rounds, full cuts Clean clarity Transparent & Vivid Reds. Average 4.6mm each Ranging Purple-Pink-Red R...
Diamond, Ruby, 14k Gold, White Gold
18K White Gold Ruby & Diamond Double Heart Arrow Brooch
Located in Great Neck Plaza, NY
A beautifully designed vintage brooch crafted in 18K white gold, featuring two interlocking hearts pierced by a stylized arrow—an enduring symbol of love and unity. The hearts are se...
Diamond, Ruby, 18k Gold, White Gold
Meghna Jewels 14K Yellow Gold Ruby Diamond Drop Earrings, 0.62ct Ruby
By Meghna Jewels
Located in Hoffman Estate, IL
Cast from 14-karat yellow gold, these beautiful earrings are hand set with .62 carats ruby and .35 carats of sparkling diamonds. FOLLOW MEGHNA JEWELS storefront to view the latest ...
Diamond, Ruby, Gold, Yellow Gold, 14k Gold
Ruby Butterfly Pendant 0.08 Carats Sterling Silver
Located in Bonita Springs, FL
Comes with Gemological Appraisal by GIA GG/AJP All Gemstones are Natural in Origin Ruby: 0.08 Carats (Treatment: Filling) Metal: Sterling Silver Dimensions: 20 x 5 mm Chain Length: 1...
Ruby, Silver, Sterling Silver
$1,175Sale Price / item|21% Off
Ruby and Diamond Baguette Ring
By Gregory Mikaelian & Sons, Inc.
Located in Los Angeles, CA
14k yellow gold ruby and diamond ring, containing 1 round ruby of gem quality weighing .36pts. and 6 baguette cut diamonds weighing .22pts. and 6 round full cut diamonds weighing .20...
Diamond, Ruby, 14k Gold
Diamond and Ruby Ballerina Brooch by Pampillonia Jewelers
By Pampillonia
Located in Bethesda, MD
This elegant brooch was designed and made at Pampillonia Jewelers. The skirt is done in a matte finished rose gold with the bottom outlined in diamonds. • Metal: 18kt Rose Gold and ...
Diamond, Ruby, 18k Gold
Round and Baguette Diamond & Ruby White Gold Brooch
Located in New York, NY
Round and Baguette Diamond & Ruby White Gold Brooch This striking White Gold brooch is a true testament to vintage glamour and expert craftsmanship. Designed with an intricate sweep...
Diamond, Ruby, 18k Gold, White Gold
AGL Burma Ruby Halo Ring. 1.40ct Unheated Cushion Cut Ruby Diamond Platinum Ring
Located in New York, NY
Other Details: Primary Stone: Ruby Center Ruby Weight: 1.40 carats Center Ruby Cut: Cushion Cut Center Ruby Type: Natural, Non-Heated Center Ruby Origin: Burma Center Ruby Setting: ...
Diamond, Ruby, Platinum
Tiffany & Co. 18k Yellow Gold Ruby Floral Brooch, Italy, 15.8g
By Tiffany & Co.
Located in New York, NY
A captivating expression of nature-inspired elegance, this exquisite Tiffany & Co. brooch showcases the maison’s signature Italian craftsmanship and timeless design. Expertly fas...
Ruby, Gold, 18k Gold, Yellow Gold
Diamond and Ruby Eternity Band
Located in Great Neck, NY
With this exquisite diamond eternity band, style and glamour are in the spotlight. This 18-karat diamond and ruby eternity band is made from 2.7 grams of gold. The top is adorned wit...
Diamond, Ruby
Tiffany & Co. Ruby Diamond 18k Yellow Gold Floral Spring Brooch
By Tiffany & Co.
Located in Boca Raton, FL
Brand: Tiffany & Co. Style: Ruby & Diamond Floral Brooch Material: 18k yellow gold Gemstones: Natural rubies approximately 0.30 carat total weight Gemstones/Diamonds: Natural dia...
Diamond, Ruby, 18k Gold, Yellow Gold
$7,680Sale Price|20% Off
Buccellatti Ruby Diamond Brooch Witches Heart 18K Yellow Gold
By Buccellati
Located in Fairfield, CT
Buccellatti Ruby Diamond Brooch Witches Heart 18K Yellow Gold This brooch by Buccellati features an intertwined double heart design in 18k yellow gold. Each heart is set with round-...
Diamond, Ruby, Gold, 18k Gold, Yellow Gold
18K Yellow Gold and Ruby Frog Pin Italian
Located in Lambertville, NJ
A beautiful vintage frog pin crafted in 18k yellow gold from Italy. It features enamel detailing and natural rubies set into the eyes. This is a heavy piece weighing 20.79g. On the b...
Ruby, 18k Gold
$10,000
Ruby and Diamond Earrings
Located in New York, NY
Circular Ruby Earrings Yellow gold and white gold circular earrings with 144 rubies and 112 brilliant round diamonds. Approximate combined ruby weight: 12.80 carats Approximate c...
Diamond, Ruby, 18k Gold
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.
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.