A natural paua shell shimmers just below the surface of this 18mm round ruby cabochon, displaying a beautiful marbled black and red pattern that has an almost mysterious air. Try this cabochon on anything from hair accessories to handmade pendants. Paua shell comes from New Zealand, where its coloring and iridescent properties have made it popular with tourists. Because the shells are natural, each cabochon will have a different pattern. Feel free to browse for other cabochons.