Chrysoberyl is a wonderful, bright durable gem with an excellent hardness of 8.5 on Mohs scale. Its colour ranges from lemon and greenish yellow, honey colours and shades from light green to brownish green. Sri Lanka, India and Brazil are the major producing countries of Chrysoberyl,.The chatoyant variety of Chrysoberyl is called Cats Eye and is highly prized. The very rare colour change variety of Chrysoberyl is Alexandrite, it is found in small deposits in Sri Lanka, Brazil, India and Madagascar. Chrysoberyl is doubly refractive with an RI of 1.744-1.770 and a specific gravity of 3.71-3.75.