Cushion Cut Blue Corundum 14.5mm x 19mm
This stone is just gorgeous and huge. IT's a statement piece, big and bold. If you are looking for something SUBTLE this is NOT it!
The mineral is widely known for its extreme hardness and for the fact that it is sometimes found as beautiful transparent crystals in many different colors. The extreme hardness makes corundum an excellent abrasive, and when that hardness is found in beautiful crystals, you have the perfect material for cutting gemstones. (geogology.com)