This Spiny Oyster Shell Dangle Necklace has incredible shades and striations of color that create a stunning chromatic effect. Not surprisingly, it is the captivating colors of the Spiny Oyster Shell that make it so sought after. Its beauty and relative rarity in the market contribute to its valuation as a precious material. It is not a stone, it's a shell that has color striations throughout, which usually keep it from being misidentified as coral. The shells range imn color from orange, red, to purple-even pink and yellow. Beautifully crafted and exquisite in its beauty! Federico Jimenez