I don't have any experience with Brilliant Earth but thought I'd chime in so you don't think people are ignoring you! I don't get the feeling that many people on this forum purchase gemstones from Brilliant Earth but I could be wrong!
There are a couple of threads at the top of the forum which may be of interest to you. One is a guide to coloured gemstone buying for anyone new to it, and the other is a list of vendors, recommended by some members who have and positive experiences.
If you wanted help finding a stone, feel free to start a new thread and I'm sure there will be people here willing to help.
I cannot address your specific question about Brilliant Earth. My only experience with buying aquamarines (except a really cheap pair on eBay) is with Dana at Mastercut Gems. He's a great guy with a good return policy if you don't like the stone. I bought a big pear aqua from him a couple of years ago and was pleased with the quality. He cut it from rough that came from Russia.
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