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<p>[QUOTE=&quot;MaJa, post: 3628793, member: 14649&quot;]Could you maybe link the source? </p><p>To my knowledge the use of Platinum in the European jewellery started around 1890; though I don&#039;t want to exclude some earlier examples. Platinum has a high melting point (1770°C) and until the 1830s/1840s you had to use chemicals to lower the melting point in order to work with Platinum. As Platinum was very expensive and is also very difficult to work on, I am 99,99% certain that the diamond is set in silver. You simply would not have wasted so much expensive material in such a setting. The setting also seams to be a bit tarnished, another indicator for silver. The silver setting of the diamond is also set in a bit clumsy way on the gold backing.</p><p>The radial indentions on the back of the ring try to imitate a 18th century setting. So given the pictures and the information we have, I would say the ring is a later copy of an 18th century ring (or inspired by 18th century rings), produced anytime between 1860 and today. Maybe the hallmarks can help us date the piece.</p><p><br /></p><p>Regarding the foil backing: you can often see it with a loupe[/QUOTE]</p><p><br /></p>

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