These are vivid green laser garnets (V:YAG) cut in fantasy cuts. Each individual stone is labelled with its carat weight and they can be purchased individually. Some of these have a slight haze to them which give them an even richer color similar to the slight haze in kashmir sapphires. These are marked 'sleepy' and I think they're even more incredible than the perfectly clean ones.
This is one of the best laser gems, vanadium YAG. It is used as a Q switch--adding a V:YAG crystal to some lasers turns them from a weak continuous-firing laser to a powerful pulsed laser that concentrates all of its energy into brief bursts of power. The color of this stuff is the most vivid green-green color I've seen in any gemstone. It's easily one of my favorite gemstones. We got slices from one crystal which had a slight haze to it, likely from nano-sized bubbles or exsolved crystals, which gives them a sort of slight sleepiness. If you have too much haze it can make a stone dead, but just the right level actually evens out the color a bit and makes it even punchier--these happily fell into the latter category.
With a hardness of 8.5 it is ideal for use in all kinds of jewelry.
