Ruby from India. Comes with certificate of authenticity. Stone type: Ruby. Dominant color: multicolored. Origin: India. Average weight (Carats): 18.5 carats. Dimensions (mm): 21 x 15 x 11 mm. Ref. : SKU030861. Red variety of corundum (Al2O3), colored by chromium. Very popular in jewelry for its color and hardness.