Corundum of a red colour are identified as Rubies. Most Sri Lankan varieties are of a pinkish red and display a tint of purple which factor perhaps is sufficient to betray to the experienced person that the stones are of Sri Lankan origin. These purplish tints are attributed to the presence of iron in addition to chromium oxide in the composition. Such stones when subject to instance heat would either lose or diminish the purplish tint thereby highlighting the principle colour, red. This colour is referred to as “Pigeon Blood Red” in gem circles.
As a rule, Ruby deposits as such have not been specifically localized in Sri Lanka and are found in association with other members of Corundum family. However, as indicated earlier the stones of better quality have been more often than not found within the Embilipitiya – Udawalawe environs