About 10 years ago I got myself a diamond eternity ring, I used to work in a jewellery shop (since closed down) and I fancied one at the time. But Iāve barely worn it. Iād like to sell it, and buy a laptop, but what would be the best way to go about it? Itās 18ct white gold, Iāve forgotten the carat rating/colour etc.....do I get it valued first?