I have bought two mined diamonds and settings from Adiamor and was happy with them. I don’t recall all the details but I do recall seeing both diamonds listed elsewhere at a higher price.
ETA just in case it helps anyone, I want to add an aside, which is that I would not take the offer from any vendor to pay by wire for a discount. It takes away the protections you get when you pay via PayPal or a credit card.