I've actually bought quite a lot of amber while in the DR, but then again, I knew a bit about amber before I ever went there. My favourite piece (and also the most expensive) I bought on my first trip to Samana. It is about 2 inches in height and about 1 1/2 wide, fairly flat, and has lots of "stuff" in it. It looks like a forest scene. It is lovely. I brought the piece back and had it sent in gold because I do not wear silver.
I have gotten some nice pieces from beach vendors, but you really do have to pick through a lot of "junk". I have found that they usually do not display amber in the boxes, but if you ask, they will bring out what they have. Again, you have to pick through. My friend and I both got nice tear drop pieces with the holes already bored through to string on a nice silk or leather cord. Don't be afraid to say, no you don't see anything that you like.
What I look for is a nice clear piece, but with some interesting "stuff" in it. Hold it up to the light to see. Also place it against you skin, to see how it will look that way, as that is how you would be wearing it.
The most important thing is to find something that is pleasing to your own eye.
I love amber, and loved it before I ever came to the DR. The fact that they have the best amber in the world, is just a bonus to me. I treasure all of the pieces that I have collected over the years.
Rose