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Antique Platinum Hallmarks

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.55 Carat Total Weight Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.0 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

1920 Art Deco Platinum 1.00cttw Antique Cut Diamond Wedding Band
Located in Hicksville, NY
Year: 1920 Item Details: Ring Size: 8.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.9
Category

1920s Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

14 Karat Gold and Platinum Old Mine Diamond Cluster Ring
Located in Hicksville, NY
Year: 1900s Item Details: Ring Size: 6 Metal Type: 14K White Gold and Platinum [Hallmarked, and
Category

Early 1900s Unknown Edwardian Antique Platinum Hallmarks

Materials

Diamond, Gold, Platinum

.20 Carat Total Weight Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 4.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.20 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

.40 Carat Total Weight Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 3.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 5.5 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

1.00 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 8.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.2 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

.74 Carat Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.0 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

.45 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 4.75 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.0 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

Art Deco Platinum Old European Cut Diamond Ring, circa 1920s
Located in Hicksville, NY
Ring Size: 5 (with ring sizing ball, 6 without) Metal Type: Platinum [Hallmarked, and Tested
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

.50 Carat Total Weight Art Deco Diamond Platinum Wedding Band
Located in Hicksville, NY
Ring Size: 6 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.1grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified .51 Carat Edwardian Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.7 grams Center Diamond
Category

Early 1900s Unknown Edwardian Antique Platinum Hallmarks

Materials

Diamond, Platinum

Platinum Edwardian 1922 Engraved Art Deco .55ct Old European Diamond Engagement
Located in Hicksville, NY
Year: 1922 (Engraved inner shank) Item Details: Ring Size: 4.5 (Sizable) Metal Type: Platinum
Category

1920s Edwardian Antique Platinum Hallmarks

Materials

Diamond, Platinum

Art Deco 1920s Platinum Black Opal and Diamond Ring
Located in Hicksville, NY
Year: 1920s Item Details: Ring Size: 10 (Sizable) Metal Type: Platinum [Hallmarked, and Tested
Category

1920s Art Deco Antique Platinum Hallmarks

Materials

Diamond, Black Opal, Platinum

Platinum Art Deco 1920s Three Stone Ring with Sapphire Accents
Located in Hicksville, NY
Year: 1920s Item Details: Ring Size: 8.25 (Sizable) Metal Type: Platinum [Hallmarked, and Tested
Category

1920s Art Deco Antique Platinum Hallmarks

Materials

Diamond, Sapphire, Platinum

Circa 1920s Platinum .50ct Old European Diamond Engagement Ring
Located in Hicksville, NY
Year: 1920s Item Details: Ring Size: 6 (Sizable) Metal Type: Platinum [Hallmarked, and Tested
Category

1920s Antique Platinum Hallmarks

Materials

Diamond, Platinum

.90 Carat Total Weight Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 8 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.3 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

.90 Carat Total Weight Art Deco Platinum Engagement Ring
Located in Hicksville, NY
Year: 1920s Item Details: Ring Size: 7.25 Metal Type: Platinum [Hallmarked, and Tested] Weight
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Platinum

Circa 1920s Art Deco Platinum Ornate Old European Diamond Ring
Located in Hicksville, NY
Year: 1920s Item Details: Ring Size: 5.5 (Sizable) Metal Type: Platinum [Hallmarked, and Tested
Category

1920s Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified 2.25 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7 Metal Type: Platinum [Hallmarked, and Tested] Weight: 5.3 grams Diamond Details: GIA
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA 1.02 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 4.75 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.63grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA 1.22 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.75 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.5 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA 1.56 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.5 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA .52 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.3 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA 1.08 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.3 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

.75 Carat Total Weight Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6 Metal Type: Platinum [Hallmarked, and Tested] Weight: 4.5 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA .73 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.0 grams Diamond Details: GIA
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA 1.32 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.0 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 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.0 grams Diamond Details: GIA
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA .53 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 4 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.5 grams Diamond Details: GIA
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA .64 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.0 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA .77 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.0 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

Edwardian 14K Yellow Gold and Platinum Diamond Cluster Halo Ring
Located in Hicksville, NY
Year: 1900s Item Details: Ring Size: 4 (Sizable) Metal Type: 14K Yellow Gold and Platinum
Category

Early 1900s Edwardian Antique Platinum Hallmarks

Materials

Diamond, Gold, 14k Gold, Yellow Gold, Platinum

1.00 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.0 grams Center Stone Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

.50 Carat Platinum Diamond Engagement Ring
Located in Hicksville, NY
Ring Size: 7.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.2 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

.96 Carat Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 4.2 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified .79 Carat Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.75 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.5grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

1.01 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.75 Metal Type: Platinum [Hallmarked, and Tested] Weight: 4.31 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

Gia Certified .75 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7 Metal Type: Platinum [Hallmarked, and Tested] Weight: 4.2 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

Circa 1920s Platinum .70ct Old European Diamond Engagement Ring
Located in Hicksville, NY
Year: 1920s Item Details: Ring Size: 5.5 (Sizable) Metal Type: Platinum [Hallmarked, and Tested
Category

1920s Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified 1.01 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.3 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified 1.42 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 8.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 5.4 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

Gia Certified 1.18 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.1 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified .73 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.2 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

Gia Certified .92 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 8.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: .92 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified .54 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 9 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.13 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified .92 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.2 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified 1.42 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 4.8 grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA 1.05 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5.75 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.3 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified .65 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.25 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified 1.10 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 4.80 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified .73 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 7.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.25 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified .83 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 9.5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 4.0 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified 1.24 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.26 grams Diamond Details: GIA
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified .55 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.92grams Center Diamond
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified 1.06 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 4.75 Metal Type: Platinum [Hallmarked, and Tested] Weight: 2.55 grams Diamond Details
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified 1.06 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3.1 grams Diamond Details: GIA
Category

1920s Unknown Art Deco Antique Platinum Hallmarks

Materials

Diamond, Platinum

GIA Certified 1.31 Carat Art Deco Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 5.25 Metal Type: Platinum [Hallmarked, and Tested] Weight: 4.6 grams Diamond Details
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.