Oleg Cassini Crystal Christmas Ornament Set of 4 &ndash; Tree, Moon, Icicle, Bell Oleg Cassini Crystal Christmas Ornament Set of 4  Tree, Moon, Icicle, Bell The set includes: Crystal Christmas Tree, Crystal Moon, Crystal Bell, and Crystal Icicle. Each has the Oleg Cassini signature hallmark. They measure about 2  - 3 inches tall and come with silver ribbons. Oleg Cassini crystal is "non lead" crystal made from K9 optical crystal