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Antique Platinum Hallmarks

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Stunning Diamond Natural Ruby Brooch Pendant Necklace
Located in Napoli, IT
: 18 Kt yellow gold and platinum, tested Hallmarks: assay from the period Gems: 1 old European cut
Category

Early 1900s Edwardian Antique Platinum Hallmarks

Materials

Diamond, Ruby, 18k Gold, Platinum

Edwardian 11.05 Carat Natural Blue Zircon 1.30 Carat Diamond Rare Ring
Located in Napoli, IT
Platinum and 18 KT rose gold So exquiste and rare hard to resist! Metal: 18 Kt rose gold and platinum
Category

Early 1900s Edwardian Antique Platinum Hallmarks

Materials

Diamond, Zircon, 18k Gold, Platinum

Belle Epoque Natural Pearl and Diamond Rare Panel Ring
Located in Napoli, IT
piece. Pure Beauty! Metal: Platinum, tested Hallmarks: none/worn Gems: 1 natural Basra pearl of 5 mm
Category

Early 20th Century Italian Belle Époque Antique Platinum Hallmarks

Materials

Diamond, Natural Pearl, Platinum

Edwardian 18ct Gold Old Cut Diamond Two Stone and Sapphire Ring, circa 1915
Located in Lancashire, Oldham
WEIGHT – 2.2g HALLMARK – Stamped ‘18ct PLAT’ and tested throughout as 18ct gold and platinum using a
Category

1910s Edwardian Antique Platinum Hallmarks

Materials

Diamond, 18k Gold, Yellow Gold, Platinum

Belle Epoque 1.15 Cart Natural No Heat Ruby
Located in Napoli, IT
) – platinum (head) Hallmarks: assay for both Gems: 1 emerald cut natural untreated ruby of approx 1.15 Ct
Category

Early 1900s Belle Époque Antique Platinum Hallmarks

Materials

Diamond, Ruby, 18k Gold, Platinum

Belle Epoque Diamond Ruby Rare Target Ring, circa 1910
Located in Napoli, IT
beauty Further Details Below Metal: 18 Kt yellow gold and platinum, tested Hallmarks: none/worn Gems: 1
Category

1910s Belle Époque Antique Platinum Hallmarks

Materials

Diamond, Ruby, 18k Gold, Platinum

Victorian Holbeinesque Diamond Ruby Natural Pearl Enameled Necklace
Located in Napoli, IT
KT gold an Platinum Enriched with approx 2.0 Ct of mine cut Diamonds G VS,very tiny natural Ruby for
Category

Early 1900s Holbeinesque Antique Platinum Hallmarks

Materials

Diamond, Natural Pearl, Ruby, 18k Gold, Platinum

Edwardian Cert. 5.29 Ct No Heat Ceylon Sapphire Diamond Pearl Rare Drop Earring
Located in Napoli, IT
generations to come Further Details Below Metal: 18 Kt yellow gold and platinum, tested Hallmarks: none/worn
Category

Early 1900s Edwardian Antique Platinum Hallmarks

Materials

Diamond, Pearl, Sapphire, 18k Gold, Platinum

Edwardian French 32.50 Ct Aquamarine Briolette 1.20 Ct Old Mine Diamond Earrings
Located in Napoli, IT
Details Below Metal: platinum and 18 Kt gold Hallmarks: French import duty hallmarks Gems: 2 pear
Category

Early 1900s French Edwardian Antique Platinum Hallmarks

Materials

Aquamarine, Diamond, 18k Gold, Platinum

Art Deco 1.51 Carat Old Cut Diamond Engagement Ring
Located in Essex, GB
embellishments in the gallery, leading to a slim platinum shank. A truly special ring. Accompanied by a diamond
Category

Early 20th Century French Antique Platinum Hallmarks

Materials

Diamond, White Diamond, Platinum

Art Deco 2.01 Carat Old Cut Diamond Engagement Ring
Located in Essex, GB
the finger. Metal – Platinum. French hallmarks.
Category

Early 20th Century French Antique Platinum Hallmarks

Materials

Diamond, White Diamond, Platinum

Pre-Revolutionary Russian Untreated Ceylon Sapphire and Diamond Bracelet
Located in Middleton, WI
carats. Hand crafted in 14 karat rose gold with platinum top. Marked with Russian hallmarks, this
Category

1910s Russian Russian Empire Antique Platinum Hallmarks

Materials

Diamond, Blue Sapphire, 14k Gold, Platinum

Antique Edwardian Diamond Solitaire Engagement Ring, circa 1915
Located in Lancaster, Lancashire
total of 1.03ct across the entire ring! All set in 18ct Yellow Gold and Platinum with hallmarks present
Category

1910s British Edwardian Antique Platinum Hallmarks

Materials

Diamond, 18k Gold, Yellow Gold, Platinum

Art Deco 1.69 Carat Old Cut Diamond Cluster Ring
Located in Essex, GB
simple double gallery, leading to split-shouldered D-shaped platinum shank. Accompanied by an
Category

Early 20th Century French Antique Platinum Hallmarks

Materials

Diamond, White Diamond, Platinum

Art Deco 2.11 Carat Old Cut Diamond Ring
Located in Essex, GB
surround, leading to a slim D-shaped platinum mount. Utterly exceptional. Accompanied by a diamond grading
Category

Early 20th Century French Antique Platinum Hallmarks

Materials

Diamond, White Diamond, Platinum

Art Nouveau .90 Carat Natural No Heat Sapphire 1.20 Carat Old Mine Diamond Ring
Located in Napoli, IT
engagement Lovely condition Further Details Below Metal: 18 Kt gold and platinum, tested Hallmarks: none
Category

Early 1900s Art Nouveau Antique Platinum Hallmarks

Materials

Diamond, Sapphire, 18k Gold, Platinum

Edwardian 0.79 Carat Old Cut Diamond Engagement Ring
Located in Essex, GB
(French hallmarks) and platinum (tested).
Category

Early 20th Century French Antique Platinum Hallmarks

Materials

Diamond, 18k Gold, Rose Gold, Platinum

Cartier Intaglio Gem Emerald Bird Ring from time of English Royalty
By Cartier
Located in New York, NY
center stone intaglio carved to depict a unique bird and set in hand-crafted French platinum are two
Category

1920s American Art Deco Antique Platinum Hallmarks

Materials

Emerald, Platinum

Art Deco 1.20 Carat Old Cut Diamond Five-Stone Ring
Located in Essex, GB
gold. The diamonds are in platinum. French hallmarks.
Category

Early 20th Century French Antique Platinum Hallmarks

Materials

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

Art Deco 0.98 Carat Old Mine Cut Diamond Ring, French, circa 1925
Located in Essex, GB
widest point and sits 7.5mm from the finger. Metal – 18k rose gold and platinum. French hallmarks.
Category

Early 20th Century French Art Deco Antique Platinum Hallmarks

Materials

Diamond, White Diamond, 18k Gold, Rose Gold, Platinum

Gold and 1 Carats Diamond French Antique Ring
Located in Saint-Ouen, FR
A lovely French antique ring, made circa 1900. Made in yellow gold 18k and platinum, French
Category

Early 1900s French Belle Époque Antique Platinum Hallmarks

Materials

Diamond, Gold

2 Carats Diamonds Antique French Crescent Brooch
Located in Saint-Ouen, FR
hallmarks for platinum (the old man) and gold (the shell). The diamonds are good quality old European cut, 2
Category

Early 1900s French Belle Époque Antique Platinum Hallmarks

Materials

Diamond

Gold Ring with Shell Cameo and Diamonds, Late 19th Century
Located in Berlin, DE
century Finely cut mussel cameo Platinum clasps with 6 diamonds hallmark and manufacturer's mark inside
Category

Late 19th Century German Belle Époque Antique Platinum Hallmarks

Materials

Diamond, 14k Gold

2 Carats Diamonds Antique French Crescent Brooch
Located in Saint-Ouen, FR
hallmarks for platinum (the old man) and gold (the shell). The diamonds are good quality old European cut, 2
Category

1910s French Belle Époque Antique Platinum Hallmarks

Materials

Diamond

2.40 Carats Diamonds French Antique Ring
Located in Saint-Ouen, FR
A very lovely antique ring, made in France circa 1915. Made in white gold 18k and Platinum (French
Category

1910s French Belle Époque Antique Platinum Hallmarks

Materials

Diamond

3 Carats Diamonds French Art Deco Earrings
Located in Saint-Ouen, FR
and platinum. Multiple hallmarks: eagle head and dog head. The two principal diamond are round
Category

1920s French Art Deco Antique Platinum Hallmarks

Materials

Diamond

2.20 Carats Diamonds and 2 Carats Emerald French Antique Ring
Located in Saint-Ouen, FR
A very beautiful ring, made in France circa 1920. Made in platinum: Dog head Hallmark. Set with
Category

1920s French Art Deco Antique Platinum Hallmarks

Materials

Diamond, Emerald

Certified Colombian Emerald Diamond Rare French Art Deco Ring
Located in Napoli, IT
Brethtaking Art Deco ring of impressive design French hallmarks, 1920 ca Solid Platinum made
Category

1920s French Art Deco Antique Platinum Hallmarks

Victorian .55 Carat Old Mine Cut Diamond Rare Solitaire Ring
Located in Napoli, IT
mounting Further Details Below Metal: 18 Kt gold and platinum, tested Hallmarks: assay quite worn Gems: 1
Category

Early 1900s Late Victorian Antique Platinum Hallmarks

Materials

Diamond, 18k Gold

Exquisite Edwardian .55 Carat Diamond Line Plus Chain Necklace
Located in Napoli, IT
, crafted of solid 18 Kt gold and Platinum Gorgeous spiral links 18 KT gold antique chain completing the
Category

Early 1900s Antique Platinum Hallmarks

Materials

Diamond, 18k Gold

Edwardian 18ct Gold 1ct Sapphire and 1ct Diamond Cluster Ring, Circa 1910
Located in Lancashire, Oldham
– Transitional DIMENSIONS - 18mm diameter MATERIALS - Platinum/ sapphire/ diamond WEIGHT – 3.77g
Category

1910s Edwardian Antique Platinum Hallmarks

Materials

Diamond, Blue Sapphire, Gold, 18k Gold, Yellow Gold

Edwardian Natural Pearl and Diamond Toi et Moi Engagement Ring
Located in Napoli, IT
, distinctive, cross over design Further Details Below Metal: 18 Kt yellow gold and platinum, tested Hallmarks
Category

1890s Victorian Antique Platinum Hallmarks

Materials

Diamond, Natural Pearl, 18k Gold

Art Deco 0.85 Carat Diamond Platinum Engagement Ring
Located in Boston, MA
hallmarked as being platinum. Dating to the height of the art deco period, this ring is a fantastic example
Category

Early 20th Century Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

Early 20th Century Chinese Rose Cut Diamond Solitaire in Platinum
Located in Boston, MA
An early 20th century diamond solitaire ring in platinum. Featuring full Chinese hallmarks for both
Category

Early 20th Century Chinese Antique Platinum Hallmarks

Materials

Diamond, Platinum

Art Deco 1.10 Carat Diamond Platinum Floral Engagement Ring
Located in Boston, MA
ring. Mounting is hallmarked as platinum.
Category

Early 20th Century American Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

1.50 Carat Total Weight Edwardian Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.6 grams Diamond Details
Category

1910s Unknown Edwardian Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA .94 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.7 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

.40 Carat Total Weight Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.8 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA .92 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5.75 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.8.0 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

2.20 Carat Diamond Platinum Engagement Ring
Located in Hicksville, NY
Item Details: Ring Size: 5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 4.2 grams Center
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

White Diamond, Platinum

.50 Carat Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.5 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

White Diamond, Sapphire, Blue Sapphire, Platinum

GIA Certified 2.33 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 4.2. grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

.80 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 8.7 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

Circa 1920s Platinum .94ct Old European Brilliant Engagement Ring
Located in Hicksville, NY
Year: 1920S Item Details: Ring Size: 9 (Sizable) Metal Type: Platinum [Hallmarked, and Tested
Category

1920s Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified 1.84 Carat Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.5 grams Center Diamond
Category

Early 1900s Unknown Edwardian Antique Platinum Hallmarks

Materials

White Diamond, Platinum

.75 Carat Total Weight Edwardian Diamond 14 Karat Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5.5 Metal Type: 14k Yellow Gold & Platinum [Hallmarked, and Tested] Weight: 5.6 grams
Category

1910s Unknown Edwardian Antique Platinum Hallmarks

Materials

Diamond, Platinum

Tiffany Co 1.00 Carat Art Deco Platinum Engagement Ring
Located in Hicksville, NY
Maker: Tiffany & Co (Hallmark engraved on inner shank) Ring Size: 5 Metal Type: Platinum
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Platinum

GIA Certified 2.60 Carat Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.45 grams Center Diamond
Category

1910s Unknown Edwardian Antique Platinum Hallmarks

Materials

White Diamond, Platinum

.80 Carat Total Weight Diamond and .20 Carat Emerald Platinum Cocktail Ring
Located in Hicksville, NY
Ring Size: 6.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 4.0grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Platinum

Art Deco Platinum Sapphire Diamond Bracelet
Located in Hicksville, NY
Year: 1930s Item Details: Metal Type: Platinum [Hallmarked, and Tested] Weight: 28.3 grams (All
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Sapphire, Platinum

Platinum Antique Pear Cut Diamond and Emerald Necklace with Diamond
Located in Hicksville, NY
Metal Type: Platinum [Hallmarked, and Tested] Weight: 6.2 grams Center Diamond Details: Weight
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Emerald, Platinum

1920s Gubelin Platinum Diamond Lapel Watch
By Gubelin Lucerne
Located in New York, NY
Approximate Measurement: 63.5mm x 27.4mm Hallmarks: Gubelin Hallmark, 0.950 PT, Platinum Hallmark at the back
Category

1920s Swiss Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

Circa 1900s Platinum GRANAT Co. Old European Diamond Engagement Ring
Located in Hicksville, NY
Year: 1900s Item Details: Ring Size: 8.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 5.6
Category

Early 1900s Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA 2.31 Carat Total Weight Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Year: 1920s Item Details: Ring Size: 7 Metal Type: Platinum [Hallmarked, and Tested] Weight: 4.2
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

Old Mine Diamond Platinum Filigree Dome Ring
Located in Stamford, CT
: Platinum Platinum Hallmark: Initials we cannot read Date 13, 1927. Width at top: 16.4mm Height at top
Category

1920s Unknown Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified .50 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.0 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified .64 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.8 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

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Antique Platinum Hallmarks For Sale on 1stDibs

Find an expansive variety of antique platinum hallmarks available on 1stDibs. These distinct designs — crafted with great care and often made from platinum, gold and 18k gold — can elevate any look. Our collection is diverse and broad-ranging, and pieces in stock date back to the 18th Century while others were produced as recently as the 20th Century. Our collection of antique platinum hallmarks includes designs that are universally popular, but Edwardian and Art Deco styles, specifically, are sought with frequency. Versions of these items have been a part of the life’s work for many jewelers, but those produced by Cartier, Tiffany Co. and Hamilton are consistently popular. Today, if you’re looking for old european cut antique platinum hallmarks and are unable to find the perfect match, our selection also includes round cut and old mine cut alternatives. There aren’t many items for men in our collection of antique platinum hallmarks, as most of the options available are for women.

How Much are Antique Platinum Hallmarks?

Prices for antique platinum hallmarks can differ depending upon size, time period and other attributes — at 1stDibs, these accessories begin at $556 and can go as high as $206,353, while antique platinum hallmarks, on average, fetch $5,500.

The Legacy of Diamond in Jewelry Design

Antique diamond rings, diamond tiaras and dazzling vintage diamond earrings are on the wish lists of every lover of fine jewelry. And diamonds and diamond jewelry are primarily associated with storybook engagements and red-carpet grand entrances — indeed, this ultra-cherished gemstone has a dramatic history on its hands.

From “A Diamond Is Forever” to “Diamonds Are a Girl’s Best Friend,” pop culture has ingrained in our minds that diamonds are the most desired, the most lasting and the most valuable gemstone. But what makes the diamond so special? Each stone — whether it’s rubies, sapphires or another stone — is unique and important in its own right. April babies might claim diamonds for themselves, but just about everyone wants this kind of sparkle in their lives!

There are several factors that set diamonds apart from other stones, and these points are important to our gem education.

Diamonds are minerals. They are made up of almost entirely of carbon (carbon comprises 99.95 percent; the remainder consists of various trace elements). Diamonds are the hardest gemstones, ranking number 10 on the Mohs Hardness Scale. Even its name, diamond, is rooted in the Greek adamas, or unconquerable. The only object that can scratch a diamond is another diamond. Diamonds are formed deep within the earth at very high temperatures (1,652–2,372 degrees Fahrenheit at depths between 90 and 120 miles beneath the earth’s surface) and are carried up by volcanic activity. Diamonds are quite rare, according to the Gemological Institute of America, and only 30 percent of all the diamonds mined in the world are gem quality.

In the 1950s, the Gemological Institute of America developed the 4Cs grading system to classify diamonds: clarity, color, cut and carat weight. Not all diamonds are created equal (there are diamonds, and then there are diamonds). The value of the diamond depends on the clarity (flawless diamonds are very rare but a diamond's value decreases if there are many blemishes or inclusions), color (the less color the higher the grade), cut (how the diamond’s facets catch the light, certain cuts of diamonds show off the stone better than others) and carat weight (the bigger, the better).

When you start shopping for a diamond engagement ring, always prioritize the cut, which plays the largest role in the diamond's beauty (taking the time to clean your diamond ring at least every six months or so plays a role in maintaining said beauty). And 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

Shop antique and vintage diamond rings, diamond necklaces and other extraordinary diamond jewelry on 1stDibs.  

Questions About Antique Platinum Hallmarks
  • 1stDibs ExpertNovember 2, 2023
    Yes, some antique rings have hallmarks. However, some do not. Before 1950, jewelry makers didn't add hallmarks to their pieces, but some did to indicate who produced the jewelry and/or tell the buyer what type of metals they contained. Shop a large collection of antique rings on 1stDibs.