This is an authentic necklace by John Hardy from his Jaisalmer collection. It is crafted from sterling silver with 18k yellow gold accent featuring a large open design curved slide pendant with yellow gold tear drops and the center of the pendant has a bezel set large pear shape blue topaz gemstone. The pendant comes with a 6.5mm wide weave chain with push in barrel clasp. It is signed by the designer with the metal content.Hallmark: JH 925 Material: sterling silver and 18k yellow goldMeasurement: chain is: 16" long x 6.5mm wide x 4.3mm thickPendant: 1.80" long x 0.76" wide x 0.60" highBlue topaz: 10.6mm long x 8.2mm wideWeight: 71.8 grams