Even in the Caribbean Tanzanite prices had rised so much in the last years.
I bought a wonderful ring, AAA-quality,trillion cut, purple-blue, about 4 carats, in 2002.
This year I tried to find matching earrings.
We found them only in smaller sizes, quality absolutly not to compare and if you find a pair with more carats and excellent dark color, it is so expensive, that we decided not to buy and because the ring has also some diamonds, we bought wonderful diamond hoops in St. Thomas for a really good price.
St. Thomas and Aruba are good places to buy jewels, but make yourself a limit and inform yourself at home about the prices.
If you donīt mind, you can buy heated Tanzanites, but you have to ask, if they are heated. The colorquality became better through the heating, but its not the genuine color.
But I cannot recommend you a special store.
Only one thing, aboid Tanzanite and Diamond International. Look at some other threads here on Caribbean Port Chat and you will see why.