Classic Collection Cuff Links Ident. No. 112998 Cufflinks round with a platinum-plated and pasting of dinosaur bone material Metal: Brass Plating: Platinum-plated Finish: polished Other Material: Bone dinosaur Stones Cut: Cut: cabochon. Specifications Dimensions: Diameter 16 mm Movement: folding clasp Special features: dinosaur bones. Petrified 65 million years ago dinosaur bone - one of the rarest minerals on the planet. It is the only mineral, wherein the pigmentation is very unusual red color, high hardness and a unique microstructure.