FLIBUSTIER jewelery is hallmarked in our workshops in accordance with French and European regulations. The manufacturer's or master's mark is used to certify the fineness of an alloy. In fact, pure silver or gold are too soft to be used alone in jewelry and common metals are added to them to make them more solid and durable. The fineness of a metal (also called fineness of the alloy)n is given in parts (by mass) for 1000 parts of alloy. For example, 750 thousandths of gold means that there are 750 parts of pure gold in 1000 parts of gold alloy. The alloy is guaranteed by the affixing of the hallmark and in the case of solid gold objects weighing more than 3g by the addition of the customs hallmark. Our standard maker's mark features a skull and the initials "FP" in a diamond. All of our pieces of jewelry, with the exception of the tiniest, bear this hallmark.