https://www.youtube.com/watch?v=WBHGwdLZMUQ
Liquid Silicone Rubber LSR-3 is specially used for the jewelry mold making application. Cures at room temperature. Great for creating molds from traditional wax carvings or when minimal shrinkage is required. Its clear nature also provide greater ease for inexperienced mold cutters, since the mold maker can see the model through the silicone rubber.