Alexandrite is a variety of chrysoberyl is perhaps rarest and Sri Lanka is famous for producing larger stones with fair colour change. The primary beauty of this gem is due to its colour change. At best Sri Lankan stones can be grass green in daylight and violet red to raspberry red in incandescent or artificial light. The gem is priced according the percentage of colour change found in the stone. Although most alexandrite can be faceted, occasionally there is unusual colour changing alexandrite cat’s eye too.