The problem with BRW these days is indeed one of quality. Much of the stuff I see for sale is not what I'd consider good enough for a guitar, and should probably been turned into a coffee table. That includes most of the fancy 'stump' wood that was in such demeand a few years ago. It's very difficult to judge this from a picture on your computer screen.
The main quality markers, IMO, are that the wood is reasonable close to quartered, at least most of the way across, and straight grained, with little run out except for 'stripe' figure. Note that the 'spiderweb' figure you see in many tropical woods, including BRW, is 'color figure' that doesn't actuallly follow the grain. It's a response of the tree to some sort of attack, such as burrowing beetles or a fungus, and amounts to chemical warfare of some sort. The black spider web lines can contain a lot of silica, for example, which presumably made the wood harder to for the bugs to chew: it certainly can do a number on edge tools! Stump wood is usually neither stright grained or lacking run out, and often has high built-in stress that can cause problems.
I would not buy any wood on line unless I could send it back. You're unlikely to get that privilege.
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