Yes I Did sell. I never heard of upgrade they never told me! So you just need to double the price? Yes shrinkage is real!!!Did you sell it? If not you could use it to upgrade to a larger stone. They will accept any stone that comes with their diamond certificate for upgrades at the original purchase price to go towards the new, larger stone. The new stone has to be min of 2x of your old one.
I also have a DBTY and experienced shrinkage lol. I was thinking of selling it, but then I learned about the upgrades, so I think I'll just get a larger stone (It doesn't even have to be the same style) at Tiffany.