Navajo sterling silver turquoise necklace by Steve Francisco, The artist's hallmark (SF) is stamped on the back of the pendant and "Sterling" is also stamped on the back of this piece. The stone measures 1.5" long by 0.6" wide and is integrated with the chain. The sterling chain necklace measures 18". A beautiful blue cabochon turquoise pendant with engraved setting. Gorgeous.