Helm pendant is crafted of solid sterling silver 925 and weighs 3.80 grams. The center of the helm is set with a genuine diamond. Measures 1.31" x 1.29" (33.4mm x 32.8mm). The hidden bail will fit up to a 6mm flat-style chain or necklace. Please note, I can set any stone and can also make this pendant in 10K or 14K white or yellow gold. please inquire for pricing.