.20 carat loose diamond NWOT still sealed in box

.20 carat loose diamond NWOT still sealed in box. I bought this years ago., never even opened the box that holds it. This is all the information that I have on this diamond what you see written on the back of the box and that was written by the seller. I got this at an auction and I’m sure I overpaid but thought perhaps someone could do something with it if they wanted to make jewelry etc..