40x30mm Imitation Turquoise Robins egg blue - sky blue cabochon S4028
This is an imitation stone. Sort of feels like a stone but it is probably porcelain or some kind of bisque. It has been glazed or colored in a way to look like turquoise. You are not going to fool anyone with this, but in terms of presenting the color tone for a mere fraction of the price it probably works. The stones are very consistent in terms of color. The little crack lines will be unique to each stone but color and also size seem to almost exact between each of them. I tried quite a few in the 40x30mm setting and they all fit really well, unlike many cut stones.