Raw unheated ruby from Andilamena, Madagascar. Comes with certificate of authenticity. Stone type: Ruby. Dominant color: red. Origin: Madagascar. Average weight (Carats): 1.56 carats. Dimensions (mm): 6.3 x 5.3 x 3.6 mm. Ref. SKU008305. Red variety of corundum (Al2O3), colored by chromium. Very popular in jewelry for its color and hardness.