Has anyone purchased a Costco (or Sams Club) Diamond ring and re-set the diamond in a custom engagement ring/band? I''ve been told that Costco diamonds are great quality for the price so I had considered purchasing an engagement ring from there only to use the diamond in my custom setting. Is this a silly thought? Am I wasting a ring/setting from Costco.... (I''m assuming it''s only worth $400-500 dollars). Any suggestion or information on whether Costco Diamonds are GIA certified or who certifys their diamonds? Thanks.