Marked on Side of Hinge 750 = 18 kt Gold 13mm Diameter Round I cannot tell whether the 6mm Round Faceted Stone is a CZ or Quality Crystal 750 gold is made of 75% gold. The remaining 25% of the piece is made up of additional alloy, metals and materials. 750 gold and 18-karat gold are the same. Both are 75% gold content. Will ship Gift Boxed Total weight is 3.3 grams, which includes the stone. I am pricing at well below market rate for gold. One Owner Always in a Non Smoking, Climate Controlled Home Fast Shipping Daily from Florida USA