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Resin Silicone Casting Molds for DIY Necklace Pendant Keychain Jewelry Crafts Diamond Silicone resin molds flexible and smooth they are easy to use and clean. Resin Silicone Casting Molds for DIY Necklace Pendant Keychain Jewelry Crafts Specifications: Material: Silicone Optional Type: Round Square Diamond Shape Size of Square Shape: 4.