US guides
If you want one added stone, buy that certified diamond and have a US jeweler set it into the band or a pendant.
If you need a row of matched melee, tell the jeweler. Carat Mate is built for a specific certified diamond, not an anonymous parcel of tiny stones.
Match color to the existing center so the US ring still looks like one piece.
Shop one identifiable stone when that is the anniversary gift. Carat Mate ships the certified loose diamond and its lab report to United States addresses. Prices on the site are in USD. Wrong-item returns may be considered within 3 days of delivery, subject to review.