Answer | Crossword Clue |
---|---|
ALUMINA | Oxide found in rubies and sapphires |
ALUMINA | Oxide in rubies and sapphires |
boehmites | A crystalline mineral compound composed of aluminum oxide and hydroxide and found in bauxite |
CORUNDUM | Sapphires and rubies. |
GEMS | Emeralds, rubies, and sapphires |
SRILANKA | Noted source of rubies and sapphires |