Roberto Coin's skull and crossbones pendant necklace has a hidden treasure

A delicate 18-karat gold chain holds a tiny diamond skull and crossbones pendant, detailed with a signature Roberto Coin ruby hidden in back. It has a lobster closure and measures either 16 1/2" or 18 1/2". The total diamond weight is .20 ct. (the diamonds are G-H in color and SI1 in clarity). This necklace is available in either white gold or rose gold ($840.00 at Nordstrom)