I bought a bunch of the flat back Swarvoski crystals. They still have the foil back and the largest size you can get is a size 34. They still work if you use a metallic mounting bezel, but they block the light. You would have to sand the foil backing off. The only ones I could find without the foil are the clear colorless ones. However, if you use the cheap-o no-name acrylic gems at Walmart the foil backing is thin enough that it still lets the light through, and you don't need a bezel. The size to go with is 9mm.
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