This is a synthetic gemstone called "YAG" - yttrium aluminum garnet, Y3Al5O12. The name is inaccurate, as garnet is a silicate mineral and this material has no silicon - it's actually yttrium aluminum oxide. This chemical does not exist naturally as a mineral, but is essentially corundum (Al2O3) with some of the aluminum replaced by yttrium. YAG is produced as a diamond simulant, but is softer, with a hardness between 8 and 9 on the Mohs Scale.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
https://creativecommons.org/licenses/by/2.0CC BY 2.0 Creative Commons Attribution 2.0 truetrue