I went to the shopping seminar on the Princess and took their advice and went to a shop they recommended in Cozumel. I bought 2 loose tanzanites at $4,000, being told they would appraise for much more by the staff there and by the woman who did the talk who also saw my purchase. To me they were an exact match to a large one I already had. After getting home and having them appraised they were only worth maybe $1,000. Since the store was referred by the ship I got all my money back after months of hassle and the store was taken of the "approved" stores the ship recommended.