This is a one-of-a-kind necklace that only the Boulder Opal Rocks with their stately charm could have pulled off. 19 boulder opal rocks and doublets (272.660 Ct) of varying shapes and sizes have been arranged in a marvelous symmetry resembling the distinct silhouette of a boomerang. Opal doublets with their crystal blue façade lend a lovely contrast to the bezel-set boulder opals. The Size-18 necklace can be adjusted for a perfect fit with 1-inch extender. The necklace has been forged from sterling silver.