Opal and diamond marquise ring

Opal and diamond marquise ring in pink gold 18 karats and platinum. Beautiful navette ring with a cabochon of opal surrounded by twelve rose-cut diamonds. The opal has an oval shape, it is translucent and has beautiful luminous plays of colour going of the green, blue to purple. It is also slightly opalescent. Antique ring from the Belle Epoque period, late Victorian, perfect for an engagement ring.

Mascaron and owl hallmarks

Finger size : 52 UE or 5,75 US (possible to size)

Dimensions of the ring head : 14 mm x 10 mm

Estimated weight of the opal : 0.41 carat
Estimated weight of the diamonds : 0.36 carat

Condition : tiny chip on one diamond

Weight : 3.27 gr

Gemological point : there are several types of opals : the precious opals and the common opals. The precious opals, like this one, have a play of colour due to the light. It is composed of tiny siliceous spheres aligned and of the same diameter. As the light hits the stone, and depending on the angle from which it is viewed, the opal's surface plays with light. The common opal does not have luminous games, these spherules are disordered, and of different diameters, the light will only give it a "milky" aspect. It was a very fashionable stone during the Art Nouveau period, at the late 19th Century.