Diamond Cylindrical Jewelry Gemstones Lapidary Review

I've drilled through the glass long enough to know I need to use a large pot of cold water, the colder the better. I even add ice cubes. I would like to rate these better as they seem to be of decent quality. But out of the thirty tips included in a presentable case, nine tips have such little coverage that there is almost nothing on the tip, I won't even try to use them. The remaining twenty-one are able to get the job done. I can't fault the seller as I believe there was no plating or…