Without a doubt, I would highly recommend Jewelry Boutique on front street. They are owned by the same people who own Ballerina.
You have received some good advice here. Working with a store that has a US office is important. If you need a repair, you don't want to have to wait until you return to the island next time.
If you go to the Jewelry Boutique, ask for Ronnie. He will not be pushy and will answer all of your questions.
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