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Square Cushion Cut Shape Diamond 18k White Gold Engagement Solitaire Ring
By Galt & Bro. Jewelers
Located in Oakton, VA
5.5 mm x 5.25 mm Cushion-Cut Center Diamond G Color Grade VS2 Clarity Grade 1.00 Carats Size 5.85
Category

2010s American Modern Engagement Rings

Materials

Diamond, 18k Gold, White Gold

Cushion Cut Amethyst Cts 2 Diamond Engagement Ring
Located in Hong Kong, HK
stunning engagement ring radiates a deep, royal purple color. Additionally, eight round diamonds
Category

2010s Hong Kong Contemporary Engagement Rings

Materials

Amethyst, Diamond, 18k Gold, 24k Gold

Peter Suchy GIA 1.01 Carat Square Cushion Cut Diamond Platinum Engagement Ring
By Peter Suchy
Located in Stamford, CT
Square cushion cut diamond 1.01ct in a platinum diamond halo setting, from the Peter Suchy Workshop
Category

21st Century and Contemporary American Engagement Rings

Materials

Diamond, Platinum

3 Carat GIA Certificate G Color Cushion Diamond Platinum Bespoke Engagement Ring
By Hasbani Diamonds
Located in London, GB
A bespoke 3.00 carat cushion cut diamond engagement ring with the perfect combination of elegance
Category

2010s British Modern Engagement Rings

Materials

Diamond, Platinum

3 Carat GIA Certificate E Color Cushion Diamond Platinum Bespoke Engagement Ring
By Hasbani Diamonds
Located in London, GB
A bespoke ring with one of the best colors and clarity center diamond, 3.00 carat cushion cut
Category

2010s British Modern Engagement Rings

Materials

Diamond, Platinum

1.30ct Antique Cushion Cut Diamond Engagement Ring, Emerald Halo, Platinum
Located in New York, NY
An emerald halo diamond engagement ring showcases a central 1.30-carat antique cushion cut diamond
Category

21st Century and Contemporary Unknown Art Deco Engagement Rings

Materials

Diamond, Emerald, Platinum

Fancy Square Yellow Cushion Diamond Ring
Located in New York, NY
Presenting our Yellow Square-Shaped Cushion Diamond Ring, the epitome of opulence and refinement
Category

2010s Indian Modern Engagement Rings

Materials

Diamond, Yellow Diamond, 18k Gold, White Gold

Platinum Diamond 9.70 Carat Cushion Cut Indicolite Tourmaline Engagement Ring
Located in Los Angeles, CA
. Stones- 1 Genuine Cushion Cut Indicolite Tourmaline 9.70 Carats, 8 Round Diamonds 4 Square Baguette
Category

21st Century and Contemporary American Art Deco Engagement Rings

Materials

Diamond, Tourmaline, Indicolite, Platinum

White Gold Aquamarine & Diamond Engagement Ring 14k Cushion Cut 1.07ctw
Located in Greensboro, NC
Information Natural Aquamarine Treatment: Heating Carat: .74ct Cut: Cushion Color: Blue Size: 6.1mm (square
Category

21st Century and Contemporary Engagement Rings

Materials

Aquamarine, Diamond, 14k Gold, White Gold

1.15 Carat Old Mine Cushion Cut Diamond Ruby Platinum Engagement Ring
Located in New York, NY
bright red square cut rubies and sparkling diamond accents. The top of the ring measures 12.5mm by 13mm
Category

20th Century Art Deco Engagement Rings

Materials

Diamond, Ruby, Platinum

J. Birnbach 1.50 carat GIA Cushion Cut Diamond Engagement Ring with Diamond Band
By J. Birnbach
Located in New York, NY
This sparkling engagement ring by J. Birnbach features a gorgeous 1.50 carat cushion cut diamond
Category

2010s American Engagement Rings

Materials

Diamond, Platinum

GIA Certified 2 Carat Cushion Cut Solitaire Diamond Engagement Ring in Platinum
By Hannah Florman
Located in Boston, MA
2 carat GIA certified square cushion diamond engagement ring with G color and VS2 clarity (**this
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Diamond, Platinum

GIA Certified 2 Carat Cushion Cut Solitaire Diamond Engagement Ring 14k Gold
By Hannah Florman
Located in Boston, MA
2 carat GIA certified square brilliant cushion diamond engagement ring with G color and VS2 clarity
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Diamond, 14k Gold

GIA 4.01 Carat H/VS2 Cushion Cut Diamond Platinum 3-Stone Engagement Ring
By Sebastian Bernard
Located in Los Angeles, CA
A beautiful square Cushion Cut H/VS2 GIA certified center Diamond set in a fine Platinum 3 stone
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Diamond, Platinum

GIA 1.52-Cts. F/If Cushion Diamond & Platinum Engagement Ring
Located in San Francisco, CA
Own the best. This platinum ring centers a 1.52-carats square cushion diamond, graded F color and
Category

2010s North American Engagement Rings

Materials

Diamond, Platinum

18K Yellow Gold Three Stone 4.84 Carat GIA Cushion Cut Diamond Engagement Ring
Located in Los Angeles, CA
Stone Cushion Cut Diamond Engagement Ring That is Out of This World! The center stone is a perfectly
Category

2010s American Art Deco Engagement Rings

Materials

Diamond, Emerald, 18k Gold, Yellow Gold

Square Cushion 14K Solid Gold Pink Tourmaline and Diamond Ring
Located in MADRID, ES
Description Square Cushion 14K Solid Gold Pink Tourmaline and Diamond Ring a uniquely handcrafted
Category

21st Century and Contemporary Spanish Contemporary Engagement Rings

Materials

Diamond, Tourmaline, 14k Gold, Yellow Gold, Gold

Tiffany & Co. Platinum True Cut Diamond Engagement Ring .59ct TW FVS1
By Tiffany & Co.
Located in New York, NY
grams Current Retail: $6,850 Diamond Specifications Center Diamond Shape: Cut-Cornered Square Mixed-Cut
Category

21st Century and Contemporary American Modern Engagement Rings

Materials

Diamond, Platinum

Tacori 1.13 Carat GIA Cushion Diamond Platinum Three-Stone Engagement Ring
By Tacori
Located in Miami, FL
carats, graded I color, and SI2 clarity. Besides two square-cut, prong-set diamonds and accented by 12
Category

21st Century and Contemporary American Modern Engagement Rings

Materials

Diamond, Platinum

GIA 1.41 Carat Brown Yellow Cushion Diamond Gold Platinum Engagement Ring
Located in Stamford, CT
Brown and yellow diamond engagement ring. Antique cushion cut natural fancy brownish yellow bezel
Category

Mid-20th Century Engagement Rings

Materials

Brown Diamond, Diamond, Yellow Diamond, Gold, 18k Gold, Yellow Gold, Pla...

Cushion Shaped Pink Diamond Halo Ring
Located in New York, NY
a 0.26 carat square cut pink diamond at its center, this ring is a true showstopper. A halo of
Category

2010s Indian Modern Engagement Rings

Materials

White Diamond, Pink Diamond, 18k Gold, Rose Gold, White Gold

Platinum Square Cushion 2.99 Carat Red Ruby & Tapered Baugette Diamond Ring GIA
Located in San Francisco, CA
This timeless three-stone platinum ring features a one-of-a-kind square cushion 2.99 carat Red Ruby
Category

21st Century and Contemporary American Engagement Rings

Materials

Diamond, Ruby, Platinum

GIA Certified 4 Carat Square Emerald Cut Diamond Platinum Ring
By Antinori Fine Jewels
Located in Rome, IT
GIA certified Asscher cut diamond, the epitome of refinement and investment value. Meticulously
Category

2010s Italian Modern Engagement Rings

Materials

Diamond, White Diamond, Emerald, Platinum

GIA 17.63 Ct Yellow SI2 Cushion Diamond Pave 18K Engagement Ring with Halo
By Sebastian Bernard
Located in Los Angeles, CA
A Beautiful Square Cushion cut Y-Z SI2 GIA certified center Diamond set in a gorgeous hand crafted
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Diamond, Yellow Diamond, 18k Gold

Certified Radiant Cut Diamond and Round Diamond Engagement Ring 18 Carat Gold
Located in Hamilton, AU
engagement ring, and will last the ages to become the most treasured heirloom. The Magdalena Ring Diamond
Category

21st Century and Contemporary Australian Contemporary Engagement Rings

Materials

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

Captivating 1.86ct. Square Radiant Halo Diamond Ring
Located in רמת גן, IL
Product Details: ~Metal: 18K White Gold ~Main stone: .1.86ct square radiant natural diamonds, light
Category

2010s Israeli Engagement Rings

Materials

Diamond, 18k Gold, White Gold

GIA Certified 1.02 Carat Diamond Platinum Engagement Ring
Located in Beverly Hills, CA
One GIA certified 1.02 ct. diamond platinum engagement ring centering one prong set, cushion
Category

21st Century and Contemporary Contemporary Engagement Rings

Materials

Diamond, Platinum

New 14k White Gold 1.55ctw No Heat Pink Cushion Sapphire Diamond Engagement Ring
Located in Montclair, NJ
Here we have a magnificent sapphire and diamond engagement ring that is newly crafted from solid
Category

2010s Engagement Rings

Materials

Pink Sapphire, Diamond, Sapphire, Rose Gold, 14k Gold, White Gold

Neil Lane Cushion and Round Diamond Halo Engagement Ring in 14 Karat White Gold
By Neil Lane
Located in Scottsdale, AZ
Diamond Cut: Cushion and Round Diamond Total Carat Weight: 1.78 carats Diamond Color: H - I Diamond
Category

21st Century and Contemporary Unknown Contemporary Engagement Rings

Materials

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

Hancocks 2.56ct Fancy Intense Yellow Old Cushion Cut Diamond and French Cut Ring
By Hancocks
Located in London, GB
A beautiful fancy intense yellow diamond and diamond ring by Hancocks, centred with an old cushion
Category

21st Century and Contemporary British Engagement Rings

Materials

White Diamond, Yellow Diamond, 18k Gold, Platinum

GIA Certified 6.54 Carat Fancy Light Yellow Cushion Cut 18K Gold Diamond Ring
Located in Aventura, FL
(sizable), this Fancy Light Yellow Cushion Cut diamond ring is dainty yet striking, perfectly suitable for
Category

21st Century and Contemporary American Modernist Engagement Rings

Materials

Diamond, 18k Gold

GIA Certified 1.17 Carat Yellow Square Diamond White Gold Engagement Ring
Located in Stamford, CT
Yellow diamond engagement ring. This GIA certified natural color cushion square cut yellow center
Category

21st Century and Contemporary Engagement Rings

Materials

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

GIA 4.75 Carat I/VS1 Cushion Diamond Platinum 3-Stone Engagement Ring W. 2 Pears
By Sebastian Bernard
Located in Los Angeles, CA
A beautiful GIA Certified 4.75 Ct Square Cushion Cut I/VS1 center Diamond set in a fine Pave Set
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Diamond, Platinum

Roman Malakov 20.18 Carat Total Mixed Cut Diamond Five-Stone Engagement Ring
By Roman Malakov
Located in New York, NY
Elegant and well crafted engagement ring showcasing a square emerald cut weighing 18.75 carats
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Diamond, Platinum

Hancocks 2.01ct Old Mine Cushion Cut Diamond Ring Tapered Baguette Shoulders
By Hancocks
Located in London, GB
A beautiful old cut diamond ring by Hancocks, centred with a bright and lively cushion shaped old
Category

21st Century and Contemporary English Engagement Rings

Materials

Diamond, 18k Gold

Tiffany & Co. 1.04 Carat Diamond Engagement Ring
By Tiffany & Co.
Located in London, GB
designers, Tiffany & Co. The centre stone is a 1.04 carat square cushion cut diamond which sits proud in a
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Platinum

Neil Lane Cushion Cut Fancy Intense Yellow Diamond and Halo Ring 14 Karat Gold
By Neil Lane
Located in Scottsdale, AZ
1.00 carat Fancy Intense Yellow cushion cut natural diamond prong set in yellow gold at the center of
Category

21st Century and Contemporary American Engagement Rings

Materials

Diamond, White Diamond, Yellow Diamond, White Gold, Yellow Gold, Gold, 1...

Peridot Diamond White Gold Engagement Ring
By Roshe Jewels
Located in Los Angeles, CA
Carat Square-Cushion Cut Peridot and has 56 Round Cut Diamonds that weigh 0.52 Carats. The total carat
Category

21st Century and Contemporary American Modern Engagement Rings

Materials

Diamond, Peridot, 14k Gold, White Gold

Art Deco 1920s Diamond Platinum Engagement Ring
Located in Chicago, IL
is designed as a stylized flowerhead. The ring features a vibrant old cushion cut diamond (7.6 x 6.8
Category

Early 20th Century Art Deco Engagement Rings

Materials

Diamond, Platinum

14 Karat White Gold Diamond Engagement Ring
Located in Scottsdale, AZ
Material: 14K white gold Center Diamond: 1 square cushion cut = 4.01ct Color: F Clarity: VS2 GIA
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, 14k Gold, White Gold

0.71ct Double Halo Cushion Frame Engagement Ring in 14 Karat White Gold
Located in Addison, TX
White Gold Diamond Center CTW: 0.71 Dia Shape: Cushion Square Radiant Cut Color/Clarity: H-I SI2
Category

21st Century and Contemporary American Art Deco Engagement Rings

Materials

Diamond, 14k Gold, White Gold

GIA 5.49ct Asscher Cut Diamond Platinum Halo Triple Stone Engagement Ring
Located in Miami, FL
spotlight, showcasing its exceptional quality, 5.49cts Genuine Natural diamond, Square Emerald cut, K color
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Platinum

Three stone engagement ring 18KT gold ring diamond ring fancy yellow ring
Located in Jupiter, FL
Stunning engagement ring with white diamond halo in 18KT gold, a bright ring with fancy yellow
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Gold, 18k Gold

Hancocks 1.65ct Old Mine Cushion Cut Diamond And 18ct Yellow Gold Ring
By Hancocks
Located in London, GB
An old cut diamond and platinum ring by Hancocks. The ring is set to the centre with an old mine
Category

21st Century and Contemporary English Engagement Rings

Materials

White Diamond, 18k Gold, Platinum

Radiant Cut Halo Pave White Gold Engagement Ring
By Antinori Fine Jewels
Located in Rome, IT
3/4 carats with a Cushion Cut Diamond and a Double Halo design. The central stone is a Natural Cut
Category

2010s Italian Modern Engagement Rings

Materials

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

TJD 0.50 Carat Round Diamond 14 Karat White Gold Square Shaped Engagement Ring
By TJD
Located in New York, NY
This ring dazzles with a round-cut center stone surrounded by a double cushion-cut halo. The total
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, White Gold

David Yurman 18K Morganite & Diamond Cushion on point Ring size 5.25
By David Yurman
Located in New York, NY
Brand David Yurman Metal Type 18K yellow Gold Ring Size 5.25 Gemstone Morganite Stone Color Pink
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Morganite, 18k Gold, Yellow Gold

GIA 1.01 Ct Fancy Light Pink Cushion Pave Set 18K Engagement Ring with Halo
By Sebastian Bernard
Located in Los Angeles, CA
A Square Cushion Cut Natural Fancy Light Pinkish Purple GIA certified center Diamond set in a
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Pink Diamond, Diamond, 18k Gold

Hancocks 1.12ct Old Mine Cushion Cut Diamond And 18ct Yellow Gold Solitaire Ring
By Hancocks
Located in London, GB
An old cut diamond and yellow gold solitaire ring by Hancocks. The ring is set with an old mine
Category

21st Century and Contemporary English Engagement Rings

Materials

White Diamond, 18k Gold, Platinum

Vintage Burmese Sapphire and Diamond Engagement Ring, circa 1950
Located in London, GB
Vintage Burmese sapphire and diamond engagement ring. Set to centre with one cushion shape old cut
Category

Vintage 1950s Unknown Engagement Rings

Materials

Diamond, Sapphire, Platinum

Tiffany & Co Novo Diamond Platinum Engagement Ring 1.26ct G-VVS2 XXX
By Tiffany & Co.
Located in Dearborn, MI
1.10ct G-VVS2 XXX Square Cushion Cut Natural Diamond Center Tiffany and Co. MSRP $22,500.00 in 2014
Category

2010s Engagement Rings

Materials

Diamond, Platinum

Salt & Pepper engagement ring 14KT white gold 1.01ct galaxy diamond ring
Located in Jupiter, FL
WEIGHT: 2.16gr METAL: 14KT white gold NATURAL DIAMOND -center Cut: Cushion (Square Brilliant) Color: H
Category

21st Century and Contemporary Unknown Modernist Engagement Rings

Materials

Diamond, 14k Gold, White Gold

1CT GH-I1 Natural Diamond Halo Engagement Ring 14K White Gold, Size 8.5
Located in Los Angeles, CA
Cushion Cut 1 CT GH-I1 Natural Diamond Halo Engagement Ring for Women 14K Gold Specification
Category

21st Century and Contemporary American Artist Engagement Rings

Materials

Diamond, 14k Gold, White Gold

1CT GH-I1 Natural Diamond Halo Engagement Ring 14K White Gold, Size 7.5
Located in Los Angeles, CA
Cushion Cut 1 CT GH-I1 Natural Diamond Halo Engagement Ring for Women 14K Gold Specification
Category

21st Century and Contemporary American Artist Engagement Rings

Materials

Diamond, 14k Gold, White Gold

1CT GH-I1 Natural Diamond Halo Engagement Ring 14K White Gold, Size 6.5
Located in Los Angeles, CA
Cushion Cut 1 CT GH-I1 Natural Diamond Halo Engagement Ring for Women 14K Gold Specification
Category

21st Century and Contemporary American Artist Engagement Rings

Materials

Diamond, 14k Gold, White Gold

1CT GH-I1 Natural Diamond Halo Engagement Ring 14K White Gold, Size 5.5
Located in Los Angeles, CA
Cushion Cut 1 CT GH-I1 Natural Diamond Halo Engagement Ring for Women 14K Gold Specification
Category

21st Century and Contemporary American Artist Engagement Rings

Materials

Diamond, 14k Gold, White Gold

1CT GH-I1 Natural Diamond Halo Engagement Ring 14K White Gold, Size 4.5
Located in Los Angeles, CA
Cushion Cut 1 CT GH-I1 Natural Diamond Halo Engagement Ring for Women 14K Gold Specification
Category

21st Century and Contemporary American Artist Engagement Rings

Materials

Diamond, 14k Gold, White Gold

1CT GH-I1 Natural Diamond Halo Engagement Ring 14K Rose Gold, Size 10.5
Located in Los Angeles, CA
Cushion Cut 1 CT GH-I1 Natural Diamond Halo Engagement Ring for Women 14K Gold Specification
Category

21st Century and Contemporary American Artist Engagement Rings

Materials

Diamond, 14k Gold, Rose Gold

1CT GH-I1 Natural Diamond Halo Engagement Ring 14K White Gold, Size 10.5
Located in Los Angeles, CA
Cushion Cut 1 CT GH-I1 Natural Diamond Halo Engagement Ring for Women 14K Gold Specification
Category

21st Century and Contemporary American Artist Engagement Rings

Materials

Diamond, 14k Gold, White Gold

1CT GH-I1 Natural Diamond Halo Engagement Ring 14K Yellow Gold, Size 4.5
Located in Los Angeles, CA
Cushion Cut 1 CT GH-I1 Natural Diamond Halo Engagement Ring for Women 14K Gold Specification
Category

21st Century and Contemporary American Artist Engagement Rings

Materials

Diamond, 14k Gold, Yellow Gold

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Square Cushion Cut Diamond Engagement Ring For Sale on 1stDibs

Surely you’ll find the exact square cushion cut diamond engagement ring you’re seeking on 1stDibs — we’ve got a vast assortment for sale. 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. Our collection of these items for sale includes 117 vintage editions and 139 modern creations to choose from as well. Making the right choice when shopping for a square cushion cut diamond engagement ring may mean carefully reviewing examples of this item dating from different eras — you can find an early iteration of this piece from the 18th Century and a newer version made as recently as the 21st Century, both of which have proven very popular over the years. Finding an appealing square cushion cut diamond engagement ring — no matter the origin — is easy, but Tiffany & Co., Roshe Jewels and Peter Suchy each produced a popular version that is worth a look. See these pages for a cushion cut iteration of this accessory, while there are also old european cut cut and old mine cut cut versions available here, too. If you’re browsing our inventory for a square cushion cut diamond engagement ring, you’ll find that many are available today for women, but there are still pieces to choose from for unisex and men.

How Much is a Square Cushion Cut Diamond Engagement Ring?

Prices for a square cushion cut diamond engagement ring can differ depending upon size, time period and other attributes — at 1stDibs, these accessories begin at $242 and can go as high as $260,365, while this accessory, on average, fetches $11,390.

Finding the Right rings for You

Antique and vintage rings have long held a special place in the hearts of fine jewelry lovers all over the world.

No matter their origin or specific characteristics, rings are timeless, versatile accessories. They’ve carried deep meaning since at least the Middle Ages, when diamond rings symbolized strength and other kinds of rings were worn to signify romantic feelings or to denote an affiliation with a religious order. Rings have also forever been emblematic of eternity.

Over time, rings have frequently taken the form of serpents, which have long been associated with eternal life, health and renewal. Italian luxury jewelry house Bulgari has become famous for its widely loved Serpenti motif, for example, and its Serpenti ring, like the other accessories in the collection, began as an homage to jewelry of the Roman and Hellenistic eras. The serpent is now a popular motif in fine jewelry. Jewelry devotees have long pined for rings adorned with reptiles, thanks to antique Victorian rings — well, specifically, Queen Victoria’s illustrious engagement ring, which took the form of a gold snake set with rubies, diamonds and an emerald (her birthstone). Designs for Victorian-era engagement rings often featured repoussé work and chasing, in which patterns are hammered into the metal.

Engagement rings, which are reliably intimidating to shop for, are still widely recognized as symbols of love and commitment. On 1stDibs, a range of buying guides can be found for those in the market for antique engagement ringsvintage engagement rings or Art Deco engagement rings

The most collectible antique engagement rings and vintage engagement rings are those from the Victorian, Edwardian and Art Deco eras. Named for the monarchies of the four King Georges, who in succession ruled England starting in 1714 (plus King William’s reign), antique Georgian rings, be they engagement rings or otherwise, are also coveted by collectors. Pearls, along with colored gemstones like garnets, rubies and sapphires, were widely used in Georgian jewelry. The late-1700s paste jewelry was a predecessor to what we now call fashion or costume jewelry

The Art Nouveau movement (1880–1910) brought with it rings inspired by the natural world. Antique Art Nouveau rings might feature depictions of winged insects and fauna as well as women, who were simultaneously eroticized and romanticized, frequently with long flowing hair. Art Deco jewelry, on the other hand, which originated during the 1920s and ’30s, is by and large “white jewelry.” White metals, primarily platinum, were favored over yellow gold in the design of antique Art Deco rings and other accessories as well as geometric motifs, with women drawn to the era’s dazzling cocktail rings in particular.

Whether you’re hunting down a chunky classic for a Prohibition-themed cocktail party or seeking a clean contemporary design to complement your casual ensemble, find an exquisite collection of antique, new and vintage rings on 1stDibs.

Questions About Square Cushion Cut Diamond Engagement Ring
  • 1stDibs ExpertNovember 2, 2021
    The cushion cut is often referred to as a pillow cut due to its square or rectangular shape with rounded edges. This stone cut comprises 58 facets, like brilliant stones. The cushion cut has been popular since the 18th century. Shop a collection of vintage and modern engagement rings set with cushion-cut diamonds from some of the world’s top jewelers on 1stDibs.