Durability. Moissanite gemstones are a 9.25 on the Mohs Scale of Hardness, so they are suitable for everyday wear. Have you ever heard of the three-month rule? It's an old-time traditional "rule" that says that your engagement ring should cost as much as three months of your significant other's salary. In our opinion, that rule is outdated and just short of completely ludacris. Diamonds are forever, right? They're supposed to symbolize the permanence of your upcoming marriage. But did you know that diamonds also have a grisly history? There's something much prettier, shinier, less expensive, and less guilt-inducing than diamonds right there for you to grab: moissanite. If you haven't decided on the ring, you intend to give to your beloved, take a minute and give thought to the possibility of a beautiful, moissanite ring. Ring Size: 18.5MM OR US SIZE 8.5 Stone weight: 1 CT Color: Blue with rainbow color mix