I am a Diamond Dealer who buys Polished as well as Unpolished Diamonds.
I pay via EFT on the day of purchase. Clients are welcome to give me a call and bring the stones to my office where I will evaluate them and then I will give the client a free quotation on the stones. Preferably all Polished stones must be accompanied by a GIA certificate.
If they are not, then I will get the certificate issued.