Lifetime Diamond Trade-Up Allowance (Diamonds over $300.00) At any time upon presentation of the Guarantee Card and Original Bill of Sale, Lugaro Jewellers will happily accept your Lugaro Jewellers loose diamond, diamond solitaire ring, solitaire diamond earrings, solitaire diamond pendant or diamond 3-stone ring towards your next purchase of a REGULAR priced diamond. Your next diamond purchase must be at least twice the price paid for the original diamond. Trade-up must be done through the Lugaro.com Please follow the same procedure as the refund/exchange.