ATTENTION, Dear customers from the USA! Please excuse me, I’m really sorry. Size: US 5.5. The diameter is 16 millimeters. Weight: 4.85 grams. Stone diameter: 9 millimeters. It is made of 875 silver (the “Star” stamp). A durable and reliable silver ring with a FIANIT stone (an artificial imitation of a diamond developed by scientists of the USSR in the 1970s). In good condition, no damage. The FIANIT stone has microscopic scuffs. FIANIT stone has a high refractive index of light, almost identical to diamond: 2.20 for FIANIT versus 2.40 for diamond. It has high hardness, strength and chemical resistance. It is used for manufacturing lasers, optical filters and jewelry. Production of the Soviet Socialist Union in the 1970s.