This lovely blue topaz necklace features a large heart-shaped stone (10mm x 10mm x 4mm) set in a platform that allows light to shine through it. The stone is fixed with three prongs. The bale is a criss-cross X. Markings on the back of the pendant include 925 CHINA and an unidentified hallmark. The 18" snake chain is 1mm thick and is marked 925 ITALY. The ensemble weighs 7.9g.