New Light Yellow Mossanit stone 9mm 3.50 carts. Excellent cut grade AAAA. Mossanites have more Brilliance, fire and luster than any other gemstone. Dimonds are at a 10 in hardness & Mossanites rate at a 9.25 in hardness. Mossanites will register as Diamonds from a reader & your Jeweler can’t tell the difference. Photos have been enlarged to show details.