Depth of Gem, closed back!
We know the diameter of a Gem is what folks see, but if you use these You must check the depth before setting. Your Gem can't help it if its cullet (bottom point) can not allow the girdle (widest) to be captured by the prongs, securing the Gem. If you try and it just splays out. Choose another mount with more room. Don't throw these out, just use pliers to bring them back into shape, measure your mounts diameter against what they were when new. They are still good, for a skinnier Gem. Brush up on how to measure a Gem. Shape matters in how you obtain the Industry Standard view. With new "Cuts" becoming popular, which mounting you choose to secure Gems becomes very important.
Reviewed by: (Verified Buyer) Sherrie-L Phillips from Southern California.