These are extra-large fantasy cut laser gems with concave facets. These are huge stones in multiple colors, grown in a lab for lasers but repurposed for gems.
The laser garnets were grown varying chemistries, creating different colors ranging from pink to orange to gold to green, And the fluorescence has multiple colors too, with some stones showing both pink AND yellow at the same time. Some of these have bubbles, a natural consequence of the growth method that produces them and one of the reasons they didn't make it into lasers.
With a hardness 8.5, the YAG laser garnets are ideal for use in all kinds of jewelry.
