The TierraCast® Sparkles Collection consists of specially engineered components precisely crafted to hold Swarovski® 14mm Rivoli Crystals. Rivolis are not drilled - they're beautiful stones from Swarovski designed to be set or glued into other components. TierraCast suggests (and I concur!) that E6000 adhesive is the best to use to set your rivolis in the frames. E6000 is available from my adhesives page.
The most important thing is to use a non-brittle adhesive. SuperGlueŽ, for example, is a very brittle adhesive and is included to crack and break if struck. Pieces that get used in jewelry need to be able to withstand a few knocks.