Precious Metal Clay Jewelry by Shahasp Valentine. Each Piece in the Organic Series is one of a kind and signed and numbered in a series. This collection is of hand-formed fine silver and/or 24-karat gold Precious Metal Clay (PMC) with precious stones and pearls. Choose from the available pieces shown here or enquire for a custom order. Stone choices include ruby, blue or fancy color sapphire, diamond, tanzanite, iolite, rhodolite or tsavorite garnet, tourmaline, cultured or fresh water pearls. Please enquire for other stone choices. Solid 22k or 24k gold available by special order.