The .Tell A Friend Program. rewards customers when someone they refer places an order and enters their email address in a special box on their order form. Diamonds On Web then sends an email with a coupon of up to $450 good toward the next jewelry purchase. If you were referred to Diamonds On Web by someone or just want to treat a friend with a great reward put in his/her e-mail address and once your order goes through we will e-mail him with a coupon of up to $450.