Grey gold ring 750 / 1000 with non heated natural sapphire of 13.50 carats - certificate

Description
Information

18 karat white gold ring (750/1000) set in the center with an unheated sapphire of 13.50 carats in an entourage of FG / VS quality diamonds for approximately 1 carat in total

GIA gemology laboratory certificate (New York).
Weight of the Sapphire: 13.50 carats / Dimension of the Sapphire: 16.11 x 13.26 x 6.83 mm natural unheated. The origin was not sought

Finger size: 53
weight of the ring: 10 grams
Front ring dimension: 19.5 mm x 20 mm

In a case
Excellent condition
The certificate will be issued with the jewel.

Gold : Because of the softness of pure gold, it is alloyed with silver, copper or palladium. The proportion of these other metals give yellow, white gold. Without precision, the gold used in jewelry is 18 K, corresponding to 75% pure gold.
Grey gold : Grey gold is obtained by adding silver, manganese and copper in specific ratios to the gold alloy.
Treated : Treated refers to a heating of a gemstone in order to homogenize and reinforce its color, but also to reduce inclusions. A non treated stone means a stone which has not been heated.
Size : Ring size. It is often possible to reduce or enlarge the size of the ring.
Sapphire : Sapphire is a gemstone of the family of the mineral corundum. The most famous color for Sapphire is blue, but trace amounts of other elements can give yellow, purple, orange, or greenish sapphires. In the case of chromium impurities in corundum it would be called a called a Ruby. Sapphires are found in Sri Lanka, Myanmar or Australia.