Beautiful and delicate spiny oyster and 925 sterling silver ring. Size 5.75. Spiny Oyster is indeed made from real turquoise and real spiny oyster shell. However, it is important to note that it is a man-made composite rather than a naturally occurring stone. This means that while the materials are genuine, the stone itself is a product of human craftsmanship. The spiny oyster can range from a beautiful orange to deep and attractive purple shades. Hard to harvest, the spiny oysters are extremely unique. It is also reported that its shells are rare to find.