These are unusual color changing dichroic green to blue-grey moissanite facet rough. Each is labelled with its gram weight and letter in the photo and they can be purchased individually.
This one is an odd variant on our normal dichroic moissanite--as the saturation increases the color actually changes with it, the gold and blue colors blending more to make a striking yellow-green down the C axis and a blue to grey color across the A. Even weirder these stones have a pronounced color shift, appearing much more golden under warmer lighting and more blue-green under cooler illumination. When polished you get a weird mix of flashes of blue, grey, green and gold.
Note that this is the newer '4H' polytype of moissanite. The crystal structure has been improved over the older versions, which means you don't have the same worries about a yellow discoloration during polishing.
