Sell Your High-Quality Diamonds or Gemstones on Consignment and Receive More Money. If you have a diamond ring you no longer wear, let us sell it for you. Or maybe a necklace or an antique piece you no longer use. consignment of these items could give you more money for your high-quality jewels than any other method. Bring them in and let us grade and appraise them for you. We’ve had great results for others.