I used a diamond mold I had purchase. The epoxy I am using is Art Resin www.ArtResin.com . This epoxy works very well when I am living in Florida. It doesn't heat up very fast and the work time is 45 mins. It gives me the opportunity to work all my diamonds including mixing the colors. These colors are made from mica powder, alcohol inks and prisme. Of course I have to add glitters to make it sparkle.  After 16 hours, I was able to add the eye hole to drill all my diamonds before it is rock hard. This is the result of using it as a keychains and necklaces.