Making Molds

Using the yellow molding rubber, I'm molding a bottleneck ring and also a custom order signet ring. I'd like both rings to be a little bit smaller than the originals are. 

Inside the mold on the left is an earring in pink molding rubber that will become a pair of earrings set with clear topaz. I'm using the pink rubber for this mold because the earring being molded was made to fit the stones, and the pink shrinks less than the yellow.