Engagement ring - 18 kt. White gold, Platinum Diamond (Natural) - Diamond
06
days
17
hours
39
minutes
01
second
Current bid
€ 50
Reserve price not met
Expert
Selected by Laura Trevino
She has 15 years' auction experience, specialising in vintage jewellery from 1920 to 2000.
Estimate € 800 - € 900
 | €50 | |
|---|---|---|
| €10 |
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Vintage Art Deco ring in platinum with an 18 karat gold construction, featuring three natural round main diamonds (0.25 ct total) and three surrounding round diamonds (0.20 ct total), ~0.45–0.55 ct total diamond weight, 2.97 g, in good used condition, without a laboratory report.
AI-assisted summary
Description from the seller
The inscription on the ring is '18CT PLAT', which means the ring is made from a combination of 18-karat gold and platinum. This type of hallmark is a so-called quality hallmark (or guarantee mark) that is very characteristic of vintage or antique jewelry, especially from the early 20th century (such as the Art Deco period from the 1920s–1940s). What does this specifically mean for the ring?
Metal distribution: In this type of vintage rings, the band (the shank) is usually made of 18-karat gold, while the setting (the head in which the diamonds are mounted) is made of platinum. Platinum was used for the setting at the time because it is stronger than gold and, with its silvery-white color, better enhances the sparkle of diamonds. "CT" versus "K": The designation "CT" (short for carat) has traditionally been used in Europe and the United Kingdom to indicate the gold content.
Age: Since it only says "PLAT" and there is no modern millesimal assurance mark (such as 950 for platinum or 750 for 18-karat gold), the ring is very likely to be pre-1975. From that period onward, official, standardized marks with numbers became legally required.
The ring is set with three genuine diamonds: two of 3 mm and one of 4 mm. Both the gold and the diamonds have been tested for authenticity, which guarantees quality and value. The ring weighs almost 3 grams and comes with a charming old box, perfect for presentation or storage.
From the photo it is clear that these are antique, hand-cut diamonds (likely an Old Mine Cut or Old European Cut). These early cuts feature a high crown and an open, flat pavilion (culet). Side stones (2 × 3 mm): This corresponds to about 2 × 0.10 to 0.12 carat. Center stone (1 × 4 mm): This corresponds (given the depth of antique cuts) to about 0.25 to 0.30 carat.
Total weight: Estimated at approximately 0.45 to 0.55 carat of diamonds. Although antique diamonds do not have the perfect brilliance of a modern brilliant cut, they are very cherished on the vintage market due to their rarity and historical charm.
The inscription on the ring is '18CT PLAT', which means the ring is made from a combination of 18-karat gold and platinum. This type of hallmark is a so-called quality hallmark (or guarantee mark) that is very characteristic of vintage or antique jewelry, especially from the early 20th century (such as the Art Deco period from the 1920s–1940s). What does this specifically mean for the ring?
Metal distribution: In this type of vintage rings, the band (the shank) is usually made of 18-karat gold, while the setting (the head in which the diamonds are mounted) is made of platinum. Platinum was used for the setting at the time because it is stronger than gold and, with its silvery-white color, better enhances the sparkle of diamonds. "CT" versus "K": The designation "CT" (short for carat) has traditionally been used in Europe and the United Kingdom to indicate the gold content.
Age: Since it only says "PLAT" and there is no modern millesimal assurance mark (such as 950 for platinum or 750 for 18-karat gold), the ring is very likely to be pre-1975. From that period onward, official, standardized marks with numbers became legally required.
The ring is set with three genuine diamonds: two of 3 mm and one of 4 mm. Both the gold and the diamonds have been tested for authenticity, which guarantees quality and value. The ring weighs almost 3 grams and comes with a charming old box, perfect for presentation or storage.
From the photo it is clear that these are antique, hand-cut diamonds (likely an Old Mine Cut or Old European Cut). These early cuts feature a high crown and an open, flat pavilion (culet). Side stones (2 × 3 mm): This corresponds to about 2 × 0.10 to 0.12 carat. Center stone (1 × 4 mm): This corresponds (given the depth of antique cuts) to about 0.25 to 0.30 carat.
Total weight: Estimated at approximately 0.45 to 0.55 carat of diamonds. Although antique diamonds do not have the perfect brilliance of a modern brilliant cut, they are very cherished on the vintage market due to their rarity and historical charm.
Details
Shape of surrounding stones
Round
Free resizing offered
No
Style
Art Deco
Diamond type of surrounding stones
Natural
Diamond type of main stone
Natural
Laboratory report
No laboratory report
Era
1900-2000
Number of diamonds main stone
3
Number of diamonds surrounding stones
3
Metal
Platinum, White gold
Brand jewellery
No
Fineness
18 kt.
Cutting style of surrounding stones
Old mine cut
Main stone
Diamond
Total carat weight of surrounding stones
0.20
Total carat weight of main stone(s)
0.25
Surrounding stones
Diamond
Total weight
2.97 g
Condition
Good condition - used with some signs of wear
Gender
Women
Shape of main stone
Round
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Catawiki always aims to offer you the best possible buying experience. Our experts virtually review and select every object in line with our submission guidelines. While we strive to provide a detailed description and photographs of each jewellery object, discrepancies or inaccuracies may occur. It is your responsibility to review all of the information provided about an object, including the condition and description, before placing an order. Sellers are responsible for the information, pictures and description provided, including the quality, quantity and nature of the jewelry supplied. A small imperfection that cannot be seen in the photo but is included in the description is not a non-conformity. A Lab Report is not a guarantee, valuation or appraisal regarding the articles described therein. A Lab Report contains only the characteristics of an article described after it has been graded, tested, examined, and analyzed using the techniques and equipment used at the time of the examination from that specific Lab. The results of any other examination performed on the article may differ depending when, how, by whom and with which grading standard the article is examined. In addition, any changes and improvements in techniques and equipment that may have occurred which may enable the examiner to detect, among other things, the use of processes for altering the characteristics of an article which use was previously undetectable, does not automatically mean the object does not conform to its description.
Catawiki always aims to offer you the best possible buying experience. Our experts virtually review and select every object in line with our submission guidelines. While we strive to provide a detailed description and photographs of each jewellery object, discrepancies or inaccuracies may occur. It is your responsibility to review all of the information provided about an object, including the condition and description, before placing an order. Sellers are responsible for the information, pictures and description provided, including the quality, quantity and nature of the jewelry supplied. A small imperfection that cannot be seen in the photo but is included in the description is not a non-conformity. A Lab Report is not a guarantee, valuation or appraisal regarding the articles described therein. A Lab Report contains only the characteristics of an article described after it has been graded, tested, examined, and analyzed using the techniques and equipment used at the time of the examination from that specific Lab. The results of any other examination performed on the article may differ depending when, how, by whom and with which grading standard the article is examined. In addition, any changes and improvements in techniques and equipment that may have occurred which may enable the examiner to detect, among other things, the use of processes for altering the characteristics of an article which use was previously undetectable, does not automatically mean the object does not conform to its description.
