 According to the "Madras Tamil Lexicon" the name comes from the word "thoramalli" (තෝරමල්ලි) or "tōra- molli", which is applied to a group of gemstones found in the southern parts of the Indian Subcontinent.According to the same source, the Tamil "tuvara-malli" (துவரைமல்லி) and "toramalli" are also derived from the Sinhalese root word.This etymology is also given in other standard dictionaries including the Oxford English Dictionary.