Skip to main content

French Cut Ruby

to
71
715
408
656
594
249
171
155
90
79
65
61
56
52
50
48
45
35
34
31
18
13
12
7
5
4
4
4
4
3
2
1
1
1
1
1
1
1
136
90
40
21
8
Sort By
1.29ct Diamond 1.00ct Ruby Engagement Ring
Located in New York, NY
center diamond is accentuated by lovely tapered baguette French cut rubies that weigh approximately
Category

20th Century Engagement Rings

Materials

Diamond, 18k Gold

GIA Certified 3.34 Carat Diamond Ruby Onyx White Gold Cocktail Ring
Located in Stamford, CT
Diamond with French cut ruby and black onyx cocktail ring. Art deco inspired custom made mounting
Category

21st Century and Contemporary Cocktail Rings

Materials

Diamond, Onyx, Ruby, Platinum

Vintage Diamond and Ruby Cluster Ring, circa 1950s
Located in London, GB
around the 1950s. It is 1.25 carats and is then wonderfully surrounded by french cut rubies. Both the
Category

Vintage 1950s Unknown Engagement Rings

Materials

Diamond, Ruby, 18k Gold

Art Deco 1940s 18K Gold Platinum 5.38tgw Ruby Diamond Link Bracelet
Located in Staines-Upon-Thames, GB
, and one-hundred-and-sixty calibre French cut rubies, in platinum and 18 karat yellow gold. This
Category

Vintage 1940s Art Deco Link Bracelets

Materials

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

Art Deco Style 3/4 Carat TCW Modern Diamond Ruby Target Halo Engagement Ring
Located in Los Angeles, CA
Cape color and sparkly clean French Cut Rubies, no damage inspected not tested Finger size 7 18 Karat
Category

Vintage 1980s American Art Deco Cluster Rings

Materials

Diamond, Ruby, 18k Gold

Round Shape Brilliant Cut Diamond Ruby Art Deco Style 18K White Gold Ring
By Unbranded
Located in Oakton, VA
in bezel and surrounded by a halo of French cut ruby with milgrain detailing, modelled in white gold
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 18k Gold, White Gold

Diamond Ruby Fancy Cut Vintage Inspired Art Deco Style Bombay White Gold Ring
By Unbranded
Located in Oakton, VA
by bright white diamonds accented by slender stripes of French cut rubies in this finger hugger
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Pink Tourmaline Ruby Diamond Halo Cut Art Deco Style Statement White Gold Ring
By Unbranded
Located in Oakton, VA
intense pink color tourmaline set into the center of the ring head. French cut rubies surround the center
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

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

Art Deco Style 15.04 Ct. Ruby Diamond Baguette Tennis 18K White Gold Bracelet
By Unbranded
Located in Oakton, VA
brilliant cut diamonds. 66 rectangular French cut rubies break up the two sections of diamonds, adding a
Category

21st Century and Contemporary Art Deco Link Bracelets

Materials

Diamond, Ruby, 18k Gold, White Gold

Art Deco Style Pink Red Ruby Diamond Baguette Tennis 18K White Gold Bracelet
By Unbranded
Located in Oakton, VA
brilliant diamonds. 72 rectangular French cut rubies break up the two sections of diamonds, adding a
Category

21st Century and Contemporary Art Deco Link Bracelets

Materials

Diamond, Ruby, 18k Gold, White Gold

Art Deco Style Pink Red Ruby Diamond Baguette Tennis 18K White Gold Bracelet
By Unbranded
Located in Oakton, VA
estimated 9.76 carats French cut rubies and 1.50 H-J/SI round brilliant cut diamonds. This wonderful piece
Category

21st Century and Contemporary Art Deco Link Bracelets

Materials

Diamond, Ruby, 18k Gold, White Gold

Old Cut Diamond Ruby Art Deco Style Pave Ring Sunburst 18K White Gold Ring
By Unbranded
Located in Oakton, VA
carats. French cut rubies total an estimated 0.75 carats. Art Deo in style, the ring highlight a candy
Category

21st Century and Contemporary Art Deco Cocktail Rings

Materials

Diamond, Ruby, 18k Gold, White Gold

Sophia D. Pear Shape Toi et Moi Ring with Diamond and Ruby
By Sophia D
Located in New York, NY
carats and a pear shaped ruby with an approximate weight of 3.00 carats surrounded with french cut rubies
Category

2010s Fashion Rings

Materials

Diamond, Ruby

Alternate Triple Red Pink Ruby Diamond Tennis Line 14K White Gold Bracelet
By Unbranded
Located in Oakton, VA
Luxuriant and colorful, this Aimée bracelet features alternating triple French cut ruby and round
Category

21st Century and Contemporary Art Deco Link Bracelets

Materials

Diamond, Ruby, 14k Gold, White Gold

Asscher Cut Diamond Ruby Art Deco Style Statement White Gold Ring
By Unbranded
Located in Oakton, VA
French cut rubies that create a stunning contrast. The ring is embellished with six additional shimmering
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Pink Red Ruby Diamond Antique Style Bow 18K White Gold Pin Brooch
By Unbranded
Located in Oakton, VA
A truly beautiful white gold bow brooch set with diamonds and French cut rubies. The milgraining of
Category

21st Century and Contemporary Brooches

Materials

Diamond, Ruby, 14k Gold, White Gold

Art Deco Style Diamond Red Pink Ruby Halo Vintage Inspired White Gold Ring
By Unbranded
Located in Oakton, VA
surrounded by French cut rubies. A gorgeous diamond and ruby target ring, made in the style of Art Deco ring
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Oval Red Pink Ruby Diamond Art Deco Style Halo Set 18K White Gold Ring
By Unbranded
Located in Oakton, VA
six French cut rubies. This eye catching ring is stunning with brilliant sparkle white diamonds on 18k
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 18k Gold, White Gold

Diamond Red Pink Ruby Antique Style Floral Flower 14K White Gold Stud Earrings
By Unbranded
Located in Oakton, VA
diamonds and 96 French cut rubies. These earrings are fresh, classical and a feminine piece of wearable art
Category

21st Century and Contemporary Stud Earrings

Materials

Diamond, Ruby, 14k Gold, White Gold

Diamond Ruby Halo Invisible Set Marquise Shape Drop 14K White Gold Earrings
By Unbranded
Located in Oakton, VA
composite of round diamonds and French-cut rubies. Information Style: Art Deco Width: 14 mm. Length: 32 mm
Category

21st Century and Contemporary Art Deco Drop Earrings

Materials

Diamond, Ruby, 14k Gold, White Gold

Pink Perfection Lily Cut Pink Amethyst Ruby Pendant Necklace in 14K Rose Gold
Located in Bangkok, TH
, surrounded by French cut rubies, as the flower protector. Necklace Information Style: Art Deco Metal: 14K
Category

21st Century and Contemporary Thai Art Deco Pendant Necklaces

Materials

Amethyst, Ruby, 9k Gold, Rose Gold

Diamond Red Ruby Art Deco Inspired Style Solitaire Engagement White Gold Ring
By Unbranded
Located in Oakton, VA
color and SI clarity grade. Interspersed with 16 round cut diamonds and displaying 12 French cut rubies
Category

21st Century and Contemporary Art Deco Solitaire Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Nova Art Deco Style Emerald Cut Diamond and Ruby Target Ring in 14K White Gold
Located in Bangkok, TH
by a fine geometric frame of French cut rubies and with diamond set shoulders, all in a finely hand
Category

21st Century and Contemporary Unknown Art Deco Engagement Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Ruby Diamond Art Deco Style Square 14K Rose Gold Stud Earrings
By Unbranded
Located in Oakton, VA
round and 40 French cut rubies with total of 0.06 carats diamonds. These simple and classic earrings are
Category

21st Century and Contemporary Art Deco Stud Earrings

Materials

Diamond, Ruby, 14k Gold, Rose Gold

Octagon Shape Blue Aquamarine Ruby Halo Set Art Deco Style 14K White Gold Ring
By Unbranded
Located in Oakton, VA
approximately 1.4 carat surrounded by a French cut ruby border and shoulders. The ring would make a lovely Art
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Aquamarine, Ruby, 14k Gold, White Gold

Art Deco Style Diamond and Ruby Target Stud Earrings in 18k White Gold
Located in London, England
bezel set amongst 14 French cut rubies and a further 18 round brilliant cut diamonds. Although a modern
Category

2010s British Art Deco Stud Earrings

Materials

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

Red Pink Ruby Diamond Art Deco Style Octagon 14K White Gold Ring
By Unbranded
Located in Oakton, VA
transitional round cut diamond on each corner, interspersed with French cut rubies. Delicate milgraining and
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Bespoke Bespoke 14ct White Gold Ruby Diamond Set "Art-Deco" Ring 4.62ct
Located in SYDNEY, NSW
Brilliant Cut Diamond, H-I Colour, P2 Clarity, weighing 2.02ct. Accompanied by 38 Square French Cut Rubies
Category

21st Century and Contemporary Art Deco Cocktail Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Heart Shape Diamond Ruby Fancy Halo Art Deco Style Heart White Gold Pendant
By Unbranded
Located in Oakton, VA
French cut ruby gemstones. The contrast between the sparkling diamond and rich rubies creates a stunning
Category

21st Century and Contemporary Art Deco Pendant Necklaces

Materials

Diamond, Ruby, 14k Gold, White Gold

Oval Red Pink Ruby Diamond Art Deco Style Omega Back 14K White Gold Earrings
By Unbranded
Located in Oakton, VA
round diamonds and French cut ruby surround the natural oval ruby. 14K White Gold. Information Width
Category

21st Century and Contemporary Art Deco Clip-on Earrings

Materials

Diamond, Ruby, 14k Gold, White Gold

Diamond Ruby Art Deco Inspired Fancy Halo Motif 14K White Gold Bangle Bracelet
By Unbranded
Located in Oakton, VA
French-cut ruby, punctuated on each side by three round diamonds. A truly superb and stunning Art Deco
Category

21st Century and Contemporary Art Deco Bangles

Materials

Diamond, Ruby, 14k Gold, White Gold

Art Deco Style White Ethiopian Opal Ruby Halo Set Cocktail 18K Gold Ring
By Unbranded
Located in Oakton, VA
. The ring is and accented with French cut rubies and punctuated its shoulders with diamonds. Ring
Category

21st Century and Contemporary Art Deco Cocktail Rings

Materials

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

Estate 14k Ruby and Diamond Ring
Located in Narberth, PA
centerpiece, which is encrusted with French cut rubies, which are tension-set. Each side of the ruby-encrusted
Category

20th Century Modern Engagement Rings

Materials

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

Ruby Diamond Art Deco Style 14K White Gold Statement Ring
By Unbranded
Located in Oakton, VA
with 16 round cut diamonds and displaying 12 French cut rubies accents weighing a total of 1.10 carats
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Art Deco Style Pink Red Ruby Diamond 18K White Gold Shield Ring
By Unbranded
Located in Oakton, VA
18k white gold ring centering 0.76 carat oval ruby framed by a halo of diamonds, with French cut
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 18k Gold, White Gold

Ruby Pave Diamond Art Deco Inspired Style Statement 14K White Gold Ring
By Unbranded
Located in Oakton, VA
French cut rubies, leading to a slightly flared diamond on the shoulders. 14K White Gold. Ring
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Art Deco Style Diamond Ruby Engagement Halo Set 18K White Gold Ring
By Unbranded
Located in Oakton, VA
diamond is M/VVS with the size of 6.5 mm. The shoulders feature French cut rubies. The ring is unique and
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 18k Gold, White Gold

Sugarloaf Cabochon Emerald Ruby Diamond Halo Side Stone 18K White Gold Ring
By Unbranded
Located in Oakton, VA
weight) Accent Gemstones Type: Ruby Shape: French Cut Size: 2 mm. Number: 20 Weight: 1.30 Carat (approx
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

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

Diamond Red Pink Ruby Art Deco Style Clover Cluster 18K White Gold Earrings
By Unbranded
Located in Oakton, VA
diamond and French cut ruby set on 18k gold. Total fourteen diamonds form a flower with a ruby trim design
Category

21st Century and Contemporary Art Deco Drop Earrings

Materials

Diamond, Ruby, 18k Gold, White Gold

Burmese Oval Shape Ruby Diamond Accent Art Deco Style 18K White Gold Ring
By Unbranded
Located in Oakton, VA
eight French cut rubies. This eye catching ring is stunning with brilliant sparkle white diamonds on 18k
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 18k Gold, White Gold

Diamond Red Pink Ruby Art Deco Inspired Style Octagon 14K White Gold Ring
By Unbranded
Located in Oakton, VA
round diamonds an inner one of French cut rubies and finished with millgrain edging, finished with
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Diamond Red Pink Ruby Art Deco Inspired Style Octagon 14K White Gold Pendant
By Unbranded
Located in Oakton, VA
outer pendant of round diamonds an inner one of French cut rubies and finished with millgrain edging
Category

21st Century and Contemporary Art Deco Pendant Necklaces

Materials

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

Oval Shape Blue Topaz Ruby Diamond Halo Art Deco Style 14K White Gold Ring
By Unbranded
Located in Oakton, VA
of one central oval shaped blue topaz surrounded by French cut rubies and round cut diamonds. A
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, Blue Topaz, 14k Gold, White Gold

Natural Oval Ruby Diamond Ring (Approx. 1.00-Carat) Diamond Halo, Platinum
Located in New York, NY
single French-cut ruby, flanked by additional old European-cut diamonds for a refined, symmetrical
Category

21st Century and Contemporary Unknown Art Deco Cocktail Rings

Materials

Diamond, Ruby, Platinum

Peridot Ruby Diamond Art Deco Style Celebrate Target 14K White Gold Ring
By Unbranded
Located in Oakton, VA
gorgeous gleaming round cut peridot framed in eye-catching contrast by French cut rubies. Each side and
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

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

Round Diamond Ruby Art Deco Style Floral Halo Set Stud Earrings
By Unbranded
Located in Oakton, VA
in the center. The diamond weighs approx. 0.1 carat and its haloed by French cut rubies and further
Category

21st Century and Contemporary Art Deco Stud Earrings

Materials

Diamond, Ruby, 14k Gold, White Gold

Oval Ruby Diamond Vintage Inspired Style Statement 14K White Gold Ring
By Unbranded
Located in Oakton, VA
An absolutely breathtaking ruby and diamond Art Deco inspired ring, featuring French cut rubies
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Octagon Amethyst Ruby Diamond Art Deco Style Halo Set 14K White Gold Ring
By Unbranded
Located in Oakton, VA
gorgeous gleaming emerald cut amethyst framed in eye-catching contrast by French cut rubies. Each side and
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

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

Art Deco Style Octagon Dark Pink Rhodolite Ruby Diamond 18K White Gold Ring
By Unbranded
Located in Oakton, VA
. Bright diamonds and French cut rubies transition the shoulders, with millgrain detailing bringing texture
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

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

Art Deco Style Diamond Red Ruby Blue Sapphire Halo Set 14K White Gold Ring
By Unbranded
Located in Oakton, VA
diamond surrounded by French cut rubies and sapphires, all set in 18k gold. A gorgeous diamond with ruby
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

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

Diamond Ruby Halo Set Vintage Inspired Art Deco Style White Gold Ring
By Unbranded
Located in Oakton, VA
designed ring is encrusted with total of twenty-five round diamonds and twenty French cut rubies, producing
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 18k Gold, White Gold

Diamond Illusion Set Red Ruby Art Deco Style Statement 14K White Gold Ring
By Unbranded
Located in Oakton, VA
. Surrounding the central diamond is a lavish halo of rich French cut rubies and round brilliant cut. This
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Emerald Ruby Diamond Vintage Inspired Art Deco Style Dinner Yellow Gold Ring
By Unbranded
Located in Oakton, VA
setting, with an oval shaped emerald of approx. 1.05 carats, surrounded by French Cut rubies and diamonds
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

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

Diamond Red Pink Ruby Antique Style Floral Flower Two Tone Gold Ring
By Unbranded
Located in Oakton, VA
diamond and French cut ruby. Total of five center diamonds form a flower with diamond and ruby petals
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

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

Diamond Red Pink Ruby Art Deco Inspired Style Floral Cluster White Gold Ring
By Unbranded
Located in Oakton, VA
diamond and French cut ruby set on white gold. Total of five center diamonds form a flower with a ruby
Category

21st Century and Contemporary Art Deco Cluster Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

3.37 Ct. Ruby Antique Style Eternity Band Ring in Platinum 950
Located in Bangkok, TH
luscious French cut rubies, which rest in a continuous channel setting. Each delicate ruby displays a vivid
Category

21st Century and Contemporary Thai Art Deco Band Rings

Materials

Ruby, Platinum

Antique Art Deco 18ct Gold Ruby Diamond Ring, Circa 1920
Located in Brighton, GB
French-cut rubies and seven single-cut diamonds, mounted in platinum. The stones are channel-set within a
Category

Early 20th Century English Art Deco Engagement Rings

Materials

Diamond, Ruby, Gold, 18k Gold

  • 1
  • ...
Get Updated with New Arrivals
Save "French Cut Ruby", and we’ll notify you when there are new listings in this category.

French Cut Ruby For Sale on 1stDibs

Surely you’ll find the exact french cut ruby you’re seeking on 1stDibs — we’ve got a vast assortment for sale. Every item for sale was constructed with extraordinary care, often using Gold, Platinum and 18k Gold. Our collection of these items for sale includes 52 vintage editions and 8 modern creations to choose from as well. Making the right choice when shopping for a french cut ruby may mean carefully reviewing examples of this item dating from different eras — you can find an early iteration of this piece from the 19th Century and a newer version made as recently as the 21st Century, both of which have proven very popular over the years. A french cut ruby from Baume — each of whom created a beautiful version of this treasured accessory — is worth considering. A french cut ruby can be a stylish choice for most occasions, but Ruby rings, from our inventory of 41, can add a particularly distinctive touch to your look, day or night. Today, if you’re looking for a french cut version of this piece and are unable to find the perfect match, our selection also includes square cut and mixed cut alternatives. Most of our french cut ruby for sale are for women, but there are 18 pieces available to browse for men.

How Much is a French Cut Ruby?

On average, a french cut ruby at 1stDibs sells for $6,000, while they’re typically $295 on the low end and $38,000 for the highest priced versions of this item.

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.

Questions About French Cut Ruby
  • 1stDibs ExpertApril 5, 2022
    A cabochon cut ruby is a ruby featuring an unfaceted cut. Instead, the surface is curved and polished, for a look that especially highlights the beauty of more opaque rubies. Browse a collection of mesmerizing cabochon cut rubies from top sellers on 1stDibs.
  • 1stDibs ExpertApril 5, 2022
    An emerald cut ruby is held in a double-claw setting, surrounded by a border of diamonds. The diamonds provide a beautiful contrast with the red of the ruby. Shop a selection of dazzling emerald cut rubies from some of the world’s top sellers on 1stDibs.
  • 1stDibs ExpertOctober 19, 2021
    The best cut for rubies is a matter of personal choice. An oval cut is the most preferred cut for ruby; this is because an oval cut reduces waste. The cut should show off this stone’s color and clarity. According to the Gemological Institute of America, the color of the July birthstone should be a vibrant to slightly purplish red, and that the stone should be clear and inclusion free. Find a collection of ruby jewelry on 1stDibs.
  • 1stDibs ExpertOctober 12, 2021
    A French cut diamond is a diamond that is cut in a square or rectangular shape, and features a high crown, along with triangle-shaped facets in a crisscross pattern. A French cut diamond is made by grinding the top of the crystal gemstone. Find a collection of antique, vintage and new French cut diamond jewelry on 1stDibs today.