This white opal necklace is an Australian opal doublet in handcrafted sterling silver. This opal pendant is perfect for everyday wear or that special occasion. A beautiful gift for anybody born in October. A doublet uses thin layer of opal and is covered by a quartz cab. This is a vintage necklace made in the 80s. Why a Doublet? Because solid natural opal stones are expensive. With a doublet you are getting a piece of REAL opal not lab made at a fraction of the price of a solid stone.