These are lab-created LuAG (Lutetium Aluminum Garnet) facet rough. Each is labelled with its gram weight and letter in the photo and they can be purchased individually.
LuAG facets similarly to YAG (Yttrium Aluminum Garnet) - ie: pretty much perfectly and easily without much complaint. It has a hardness of 8.5 and no durability issues. It has very good optical properties with an RI of 1.83, just slightly better than yag. It fluoresces even more powerfully than Ce:YAG, with an intense yellow-green color. Even normal room lights will make it fluoresce, and outdoors with indirect sunlight can make it look like it is photoshopped into real life. It is just a great material overall. The faceted gems cut from this material are guaranteed to catch the eye!
