This is a brilliant cut, synthetic gemstone called "cubic zirconia", which is zirconium dioxide, ZrO2. This chemical exists naturally as the mineral baddeleyite. Cubic zirconia is a produced as a diamond simulant - it is usually clear ("colorless"). Compared with diamond, cubic zirconia is softer and heavier.
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