Platinum Square 18 Carat
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4.47 Carat '1/4 Cts' Asscher Cut 'Square Emerald Platinum Diamond Eternity Ring
By Sebastian Bernard
Located in Los Angeles, CA
This beautiful Eternity Ring is made of Platinum showcasing 18 perfectly matched 1/4 Ct (VS/E-F
Category
2010s American Wedding Rings
Materials
Diamond, Platinum
Nally Square Shaped Diamond Platinum Eternity Band Ring
Located in New York, NY
Beautiful 18 square shape diamonds set in platinum with common prong style.
Each diamond is 0.29
Category
2010s American Contemporary Wedding Rings
Materials
Diamond, Platinum
Art Deco Diamond Square Sapphire Hinged Platinum Bracelet
Located in Stamford, CT
Original 1920s handmade diamond and sapphire solid hinged Platinum bracelet. Complete with hand
Category
Vintage 1920s Art Deco Retro Bracelets
Materials
Diamond, Sapphire, Platinum
10.75 Carat GIA Yellow Sapphire Platinum and 18 Karat Ring
Located in METAIRIE, LA
Certified 10.75 carat Cushion cut Vivid Yellow Sapphire, securely set in an 18KT Yellow Gold 4-Prong
Category
Vintage 1980s Engagement Rings
Materials
Yellow Sapphire, Diamond, 18k Gold, Platinum
Art Deco Diamond Platinum and 18 Carat Gold Panel Ring
Located in Chipping Campden, GB
This gorgeous square panel holds nine sparkling diamonds set in platinum. The stones total 45pts
Category
Vintage 1910s British Art Deco More Rings
Materials
Diamond, Gold, Platinum
2.43 Carats Diamond 18 Karat Yellow Gold Platinum Daisy Ring
Located in Poitiers, FR
Ring in 18 karat yellow gold, and platinum, eagle head and dog head hallmarks.
Magnificent daisy
Category
2010s French Modern Cluster Rings
Materials
Diamond, White Diamond, Platinum, Gold, 18k Gold, Yellow Gold
Art Deco Diamond Platinum and 18 Carat Gold Panel Ring
Located in Chipping Campden, GB
This gorgeous square panel holds sparkling diamonds set in platinum and the rest of the ring is
Category
Vintage 1910s British Art Deco More Rings
Materials
Diamond, Gold, Platinum
Art Deco Large Platinum 18 Carats of Diamonds and Emeralds Bracelet
Located in Chicago, IL
3/4 carat each, a center row of Square, Step cuts and Round European cuts totaling 18 Carats and all
Category
Vintage 1930s American Art Deco Tennis Bracelets
Materials
Diamond, Emerald, Platinum
15.62 Carat Multi-Sapphire Diamond 18 Karat Gold Platinum Cluster Earrings
Located in Philadelphia, PA
carat; G/H color with VS to SI clarity
Completed by posts and friction backs
Tested as 18 karat gold
Category
1990s Contemporary Drop Earrings
Materials
Blue Sapphire, Green Sapphire, Yellow Sapphire, Pink Sapphire, Sapphire,...
Art Deco Diamond, 18 Carat Gold and Platinum Three-Stone Panel Ring
Located in Chipping Campden, GB
In classic Art Deco style this three stone diamond ring is made up of squares and panels of
Category
Vintage 1920s British Art Deco Band Rings
Materials
Diamond, Platinum, Gold
Edwardian Pearl 2.25 Carat Diamond Ruby Platinum-Topped 18 Karat Gold Necklace
Located in Philadelphia, PA
worn as a brooch via pin stem and closure
Tested as platinum-topped 18 karat gold
Circa: 1910
Length
Category
Vintage 1910s Edwardian Drop Necklaces
Materials
Diamond, White Diamond, Pearl, Ruby, Gold, 18k Gold, Yellow Gold, Platinum
Free Shipping
L 17.25 in
NALLY Square Shape Diamond Eternity Band Ring
Located in New York, NY
Elegant 18 square shape diamonds set platinum, with total weight of 4.75 carats
Each diamond is
Category
2010s American Contemporary Band Rings
Materials
Diamond, Platinum
2.04 Carat Diamond Gold Platinum Solitaire Engagement Ring
Located in Jesmond, Newcastle Upon Tyne
A stunning, fine and impressive 2.04 carat asscher cut diamond and 18 karat yellow gold, platinum
Category
2010s Scottish Contemporary Solitaire Rings
Materials
Diamond, Gold, 18k Gold, Platinum, Yellow Gold
Vintage Platinum 0.92ct Round Diamond Solitaire Squared Pendant w/Cable Chain
Located in Montclair, NJ
- 6.5x6.42x3.38mm (approx.)
Total Carat Weight: 0.92 (approx.)
Material: Solid Platinum Pendant w/ 14k White Gold
Category
21st Century and Contemporary Pendant Necklaces
Materials
Diamond, Platinum
Free Shipping
H 0.26 in W 0.26 in
5.02 Carat Diamond Emerald Art Deco Platinum Pendant Necklace
Located in Stamford, CT
diamonds with square cut natural green emeralds set in a handmade platinum setting. 18 inches long with a
Category
Early 20th Century Pendant Necklaces
Materials
Diamond, Emerald, Platinum
Peter Suchy GIA Certified 1.11 Carat Diamond Platinum Pendant Necklace
By Peter Suchy
Located in Stamford, CT
Old mine oval and square cushion cut diamonds made into a classic dangle pendant, set in platinum
Category
21st Century and Contemporary Pendant Necklaces
Materials
Diamond, Platinum
4.45 Carat Ruby 1.90 Carat Zambian Emerald 3.85 Carat Diamond Platinum Brooch
Located in Jesmond, Newcastle Upon Tyne
3.85 carat diamond, platinum, 9 and 18 karat white gold brooch; part of our diverse jewelry collections
Category
Vintage 1930s Unknown Brooches
Materials
Diamond, Emerald, Ruby, 18k Gold, 9k Gold, Platinum
Free Shipping
H 0.37 in W 2.01 in L 2.95 in
20.00 Carat Aqua Diamond Sapphire Platinum Art Deco Pendant Necklace
Located in Stamford, CT
cut diamonds, G VS approx. .25cts
3 French cut square blue sapphires, approx. .6cts
Platinum
Stamped
Category
Early 20th Century Pendant Necklaces
Materials
Diamond, Sapphire, Platinum
Ring 18 Carat Yellow and White Gold Tourmaline Atelier Zobel
By Zobel
Located in Berlin, DE
Magnificent ring by Zobel is a masterpiece of craftmanship. The unusual design is typically for Atelier Zobel.
With a rose colored tourmaline of 30 x 11 mm / 1.18 x 0.43 inches, set ...
Category
1990s European Modern Solitaire Rings
Materials
Tourmaline, Yellow Gold, Platinum
AGL Certified 13.49 Carat Minor Oil Colombian Emerald in Platinum 950
By Gad & Co.
Located in Miami, FL
a 13.49 carat minor oil Colombian Emerald. Square emerald cut with vivid green color, excellent
Category
2010s Colombian Art Deco Pendant Necklaces
Materials
Diamond, Emerald, Platinum
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H 1.19 in W 0.91 in
Art Deco Sapphire and Diamond and 18 Carat Gold Ring
Located in Chipping Campden, GB
all set in platinum. The sapphires measure 45pts in total.
Ring Size: I or 4 1/2
Height Off Finger
Category
Vintage 1920s British Art Deco Three-Stone Rings
Materials
Diamond, Sapphire, Gold, Platinum
Contemporary 0.31 Carat Natural Emerald & Diamond Band 18 Carat Yellow Gold
Located in Hamilton, AU
Crafted in 18 carat yellow gold, this delightful contemporary ring holds an alluring natural green
Category
20th Century Australian Contemporary Wedding Rings
Materials
Emerald, White Diamond, Diamond, 18k Gold, Yellow Gold, Gold
Peter Suchy GIA Certified 1.51 Carat Diamond Sapphire Engagement Platinum Ring
By Peter Suchy
Located in Stamford, CT
, mounted in a platinum 8 prong setting. This ring is highly detailed, accented with 18 full cut round
Category
21st Century and Contemporary Unknown Engagement Rings
Materials
Diamond, Sapphire, Platinum
Antique 1900s Ruby 3.48 Carat Diamonds Gold Platinum Pendant Brooch
Located in Jesmond, Newcastle Upon Tyne
A magnificent and exceptional antique 3.48 carat diamond and 0.53 carat ruby, platinum and 18 karat
Category
Antique Early 1900s American Brooches
Materials
Diamond, Ruby, 18k Gold, White Gold, Yellow Gold, Platinum, Gold
Multi-Row Concave Wide Diamond Band Ring in 18 Karat Yellow Gold and Platinum
Located in Scottsdale, AZ
, verifying its authenticity and current appraisal value.
Metal: 18 Karat White Gold and Platinum
Gemstones
Category
21st Century and Contemporary Unknown Contemporary Band Rings
Materials
White Diamond, Diamond, Platinum, Yellow Gold, 18k Gold, Gold
14.22 Carat Colombian Emerald Diamond Platinum Pendant, GIA Certified
Located in Beverly Hills, CA
fabricated in platinum and ready to be worn.
Pendant Length: 1.4 inches
Chain Length: 18 inches
Weight
Category
21st Century and Contemporary North American Pendant Necklaces
Materials
Diamond, Emerald, Platinum
5.04 Carat Diamond Line Tennis Bracelet Set in Platinum
Located in London, GB
A beautiful contemporary diamond line bracelet set in platinum.
The bracelet is composed of a
Category
2010s British Modern Tennis Bracelets
Materials
Diamond, Platinum
6.03 Carat Diamond Line Tennis Bracelet Set in Platinum
Located in London, GB
A lovely contemporary diamond line bracelet set in platinum.
The bracelet is composed of a grand
Category
2010s British Modern Tennis Bracelets
Materials
Diamond, Platinum
Vintage 3.58 CTW Emerald Diamond Platinum 18 Karat Gold Ballerina Halo Ring
Located in Philadelphia, PA
Centering a square emerald cut emerald weighing 1.50 carats - transparent medium green in color
Category
Vintage 1980s Modern Engagement Rings
Materials
Emerald, Diamond, Gold, Yellow Gold, Platinum
Peter Suchy EGL 2.06 Carat Fancy Yellow Diamond Halo Platinum Engagement Ring
By Peter Suchy
Located in Stamford, CT
Handmade yellow diamond with diamond halo platinum engagement ring. The EGL certified 2.06ct center
Category
21st Century and Contemporary Engagement Rings
Materials
Diamond, Yellow Diamond, Platinum
Antique 9.60ct Aquamarine, 0.28ct Diamond and Platinum Pendant
Located in Jesmond, Newcastle Upon Tyne
A stunning, fine and impressive antique 6.50 carat aquamarine and 0.28 carat diamond, platinum
Category
Vintage 1930s Pendant Necklaces
Materials
Aquamarine, Diamond, Platinum
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H 0.41 in W 0.6 in L 1.54 in
3.04 Carat Old Cut Diamond Line Tennis Bracelet in Platinum
Located in London, GB
A beautiful contemporary diamond line bracelet set in platinum.
The bracelet is composed of a
Category
2010s British Modern Tennis Bracelets
Materials
Diamond, Platinum
Art Deco 0.36 CTW Platinum 18 Karat Yellow Gold Volute Vintage Engagement Ring
Located in Philadelphia, PA
Bead set in a platinum square form head with gold lattice motif gallery
With pierced platinum scrolling
Category
Vintage 1930s Art Deco Engagement Rings
Materials
Diamond, Gold, 18k Gold, Yellow Gold, Platinum
Art Deco Diamond and Sapphire 18 Carat Gold Ring
Located in Chipping Campden, GB
is modelled in 18ct gold and the stones are set in platinum.
Ring Size: N or 6 3/4
Weight: 2.4g
Category
Vintage 1920s British Art Deco Band Rings
Materials
Diamond, Sapphire, Gold
GIA 2.21 Carat Fancy Yellow Radiant Cut Diamond Platinum 18k Gold Ring
Located in Beverly Hills, CA
One GIA 2.21 Carat Fancy Yellow Radiant Cut Diamond Platinum 18k Gold Ring. Featuring one GIA cut
Category
21st Century and Contemporary Engagement Rings
Materials
Brown Diamond, Yellow Diamond, White Diamond, Diamond, Platinum, Yellow ...
GIA 1.51 Carat Fancy Light Yellow Princess Cut Diamond Platinum 18k Yellow Gold
Located in Beverly Hills, CA
weight of 0.17 carat, graded G-H color, VS-SI1 clarity. Crafted in platinum and 18 karat yellow gold with
Category
21st Century and Contemporary Engagement Rings
Materials
Diamond, White Diamond, Yellow Diamond, Gold, 18k Gold, Yellow Gold, Pla...
1.75 Carat Vivid Pink Purple Rhodolite Garnet 950 Platinum Pendant Necklace
By Gems and Jewels UK
Located in Birmingham, GB
Fine Square Cut Rhodolite Garnet Platinum Pendant Necklace.
1.75 Carat Rhodolite with a stunning
Category
21st Century and Contemporary Art Deco Pendant Necklaces
Materials
Garnet, Rhodolite, Platinum
Contemporary Emerald & Diamond Art Deco-Inspired 18 Carat White Gold Ring
Located in Hamilton, AU
Crafted with perfect love, this wondrous 18 carat white gold ring has a gorgeous milgrain cluster
Category
21st Century and Contemporary Australian Contemporary Cluster Rings
Materials
Diamond, Emerald, 18k Gold, White Gold
1990's Diamond Platinum 18 Karat Yellow Gold Split Vintage Band Ring
Located in Philadelphia, PA
carat total
Eye clean and bright - flush set in cluster
Shank tapers with squared-off edges
Stamped for
Category
1990s Modern Band Rings
Materials
Gold, 18k Gold, Yellow Gold, Platinum
1950s 1.45 Carat Pink Sapphire and Diamond White Gold and Platinum Cocktail Ring
Located in Jesmond, Newcastle Upon Tyne
A fine Art Deco 1.45 carat pink sapphire and 0.96 carat diamond, 18 karat white gold and platinum
Category
Mid-20th Century Unknown Art Deco Engagement Rings
Materials
Pink Sapphire, Diamond, 18k Gold, Platinum, White Gold
Art Deco Sapphire and Diamond 18 Carat Gold Three-Stone Ring
Located in Chipping Campden, GB
bright sparkling diamond. The square cut sapphire measures 40pts and the old European cut diamonds
Category
Vintage 1920s British Art Deco Three-Stone Rings
Materials
Diamond, Sapphire, Gold
Art Deco Sapphire and Diamond 18 Carat Gold Three-Stone Ring
Located in Chipping Campden, GB
is a bright sparkling diamond. The square cut sapphire measures 50pts and the old European cut
Category
Vintage 1920s British Art Deco Three-Stone Rings
Materials
Diamond, Sapphire, Gold
Shreve, Crump & Low GIA Certified 7.03 Ct Fancy Yellow Square Cut Diamond Ring
By Shreve, Crump & Low
Located in Boston, MA
square emerald cut diamond is custom set in a handcrafted Shreve, Crump & Low platinum and 18 karat
Category
2010s American Engagement Rings
Materials
Diamond, Yellow Diamond, 18k Gold, Yellow Gold, Platinum
Art Deco Sapphire and Diamond 18 Carat Gold Three-Stone Ring
Located in Chipping Campden, GB
set in platinum.
Ring Size: M or 6 1/4
Widest Point: 5mm
Weight: 2.4g
Category
Vintage 1920s British Art Deco Three-Stone Rings
Materials
Diamond, Sapphire, Gold
French 1925s Diamonds 18 Karat White Gold Platinum Art Deco Ring
Located in Poitiers, FR
Ring in 18 karat white gold, eagle head hallmark and platinum, dog's head hallmark.
This authentic
Category
Vintage 1920s French Art Deco Bridal Rings
Materials
Diamond, White Diamond, Gold, 18k Gold, White Gold, Platinum
Art Deco French Ruby Diamond Platinum 18 Karat Yellow Gold Shield Stickpin
Located in Philadelphia, PA
set in platinum
Completed by pinstem
Stamped with French hallmark for 18 karat gold and tested as
Category
Vintage 1930s Art Deco Brooches
Materials
Diamond, Ruby, Gold, 18k Gold, Yellow Gold, Platinum
3 Carat GIA Certificate G Color Cushion Diamond Platinum Bespoke Engagement Ring
By Hasbani Diamonds
Located in London, GB
of 0.25 carat round brilliant cut. This is a stunning diamond engagement ring set in platinum with
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
completely bespoke and exquisite for the discerning lady. Expertly hand crafted in 18 karat gold or platinum
Category
2010s British Modern Engagement Rings
Materials
Diamond, Platinum
Retro Emerald and Diamond Earrings in 18 Karat and Platinum, circa 1940s
Located in Wailea, HI
Retro Emerald and Diamond Earrings in 18k and Platinum c. 1940's
Two Square Cut Diamonds weighing
Category
Mid-20th Century Unknown Retro Clip-on Earrings
Materials
White Diamond, Emerald, 18k Gold, Platinum
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W 1.05 in D 0.24 in L 1.58 in
Antique 0.24Ct Sapphire and 0.12Ct Diamond Platinum Pin Brooch Circa 1930
Located in Jesmond, Newcastle Upon Tyne
A fine and impressive antique 1930s 0.24 carat sapphire and 0.12 carat diamond, platinum pin brooch
Category
Vintage 1930s Brooches
Materials
Diamond, Sapphire, White Gold, Platinum
Free Shipping
H 0.1 in Dm 0.47 in L 2.5 in
Art Deco Three Stone Emerald, Diamond Ring in Platinum
Located in OVIEDO, AS
carats
Measurements: 3.87 x 3.68 x 3.40 mm; 4.47 X 4.07 X 3.90mm
Hand fabricated in gleaming 18 Karat
Category
Vintage 1930s Spanish Art Deco Three-Stone Rings
Materials
Diamond, Emerald, Platinum
Art Deco 3 Carat Diamond and Ruby Tablet or Plaque Ring in Platinum, Circa 1925
Located in Sherman Oaks, CA
initially sees a square, but then picks up circles, triangles, arcs, lines, banners and channels.
Beyond
Category
Early 20th Century Unknown Art Deco Cocktail Rings
Materials
Diamond, White Diamond, Ruby, Platinum
Art Deco Emerald and Diamond 18 Carat Gold Cluster Ring
Located in Chipping Campden, GB
A stunning bright green square cut emerald sits at the centre of a gorgeous sparkling diamond halo
Category
Vintage 1920s British Art Deco Cluster Rings
Materials
Diamond, Emerald, 18k Gold, Platinum, Gold
Platinum and Diamond Ring
Located in New York, US
Centering a square emerald cut diamond, accented by 18 single cut diamonds. - Emerald cut diamond
Category
Vintage 1940s Cocktail Rings
Materials
Diamond, Platinum
Edwardian Emerald and Diamond 18 Carat Gold Five-Stone Cluster Ring
Located in Chipping Campden, GB
An exquisite five-stone ring set with beautiful square cut emeralds which total 1.1ct. Surrounding
Category
Antique Early 1900s British Edwardian Three-Stone Rings
Materials
Diamond, Emerald, Gold, Yellow Gold, Platinum
Rare GIA Certified 50 Carat Greenish Blue Zircon Pendant In 18K and Platinum
Located in Miami, FL
, expertly crafted with platinum 900 and 18K yellow gold, weighs 26.25 grams and measures 1.50" x 0.7" inches
Category
21st Century and Contemporary North American Art Deco Pendant Necklaces
Materials
Diamond, Blue Zircon, Zircon, 18k Gold, Yellow Gold, Platinum
Free Shipping
W 0.7 in L 1.5 in
Hemmerle Bangle Bracelet In 18Kt Gold And Platinum With 22.65 Ctw Red Rubies
By Hemmerle
Located in Miami, FL
yellow gold of 18 karats with details in solid platinum for the setting of the gemstones. It is fitted
Category
Late 20th Century German Modernist Bangles
Materials
Ruby, Gold, 18k Gold, Yellow Gold, Platinum
Free Shipping
W 0.36 in L 7.5 in
Edwardian Diamond, Ruby, Platinum and Gold 'Navette' Ring
Located in New York, NY
An Edwardian platinum and 18 karat gold ring with rubies and diamonds. The ring has 52 square-cut
Category
Vintage 1910s Edwardian Cocktail Rings
Materials
Ruby, Diamond, White Diamond, 18k Gold, Gold, Platinum, White Gold
Huge 15 Carat Emerald and 1Carat Diamond 18 Carat Gold Cluster Cocktail Ring
Located in St Helens, GB
A stunning and large Emerald and Diamond cocktail ring.
Solid 18 carat yellow gold shank with
Category
20th Century Cocktail Rings
Materials
Diamond, Emerald, Gold
1990s Platinum Diamond Stud Earrings
Located in Dallas, TX
earrings are crafted with 18 square cut diamonds with a total combined weight of 1.62 carats. These
Category
1990s Stud Earrings
Materials
Diamond, Platinum
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Platinum Square 18 Carat For Sale on 1stDibs
Find the exact platinum square 18 carat you’re shopping for in the variety available on 1stDibs. Each design created in this style — which was crafted with great care and often made from Gold, Platinum and 18k Gold — can elevate any look. Our collection of these items for sale includes 21 vintage editions and 9 modern creations to choose from as well. Finding the perfect platinum square 18 carat may mean sifting through those created during different time periods — you can find an early version that dates to the 20th Century and a newer variation that were made as recently as the 21st Century. As it relates to this specific piece, our collection includes designs that are universally popular, but 2 Carat and 2.5 Carat carat weights, specifically, are sought with frequency. There have been many well-made iterations of the classic platinum square 18 carat over the years, but those made by Shreve, Crump & Low, Brunello Cucinelli and David Gross Group are often thought to be among the most beautiful. A square cut version of this piece has appeal, but there are also asscher cut and cushion cut versions for sale. If you’re browsing our inventory for a platinum square 18 carat, 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 Platinum Square 18 Carat?
The price for a platinum square 18 carat starts at $396 and tops out at $230,000 with these rings, on average, selling for $11,441.
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