Swarovski 5817 Crystal Pearls are made with a crystal core. The mother of pearl-like layers are then applied evenly to the core which ensures harmonious tones and color matching. The surface finish is consistent and gently reflects light to create an irresistible appeal. They are resistant to wear, the sun's rays, perspiration and perfume to retain their shimmer for a very long time. Swarovski 5817 1/2 Drilled Cabochon Pearl shown here in Iridescent Dark Turquoise 8mm.