Metal: Alchemia Lead Free, Nickel Free, Hypoallergenic Baked lacquer finish to protect metal from turning or tarnishing Stone: Fossil Shark Tooth Due to the one-of-a-kind nature of the teeth, the color and shape pattern may vary slightly from the image shown. Shark Tooth: Approx. 12mm x 16mm Adjustable 2mm Double Ring Shank Fits Ring Sizes: 5-10 Handcrafted and artisan made All pieces are stamped or hallmarked for authenticity Metaphysical Properties: Promotes strong bone growth