Swarovski 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. 3 mm pearls have 200 pearls per strand 4-6 mm size has 100 pearls per strand and 7mm and up have 50 pearls per strand. The Swarovski 5810 has a hole size of .90 mm, for a larger hole size, please try Swarovski 5811 with a hole size of 1.4 mm.