William Duffield
Yellowheart grows in Brazil, while Anigre is from Africa. I don't think I have samples of either one in my stash. Every so often, I kick myself for not buying a few boards of Anigre from Ellis when he was having his moving sale. I'm reminded again every time I visit Hearne Hardwoods and give his yellow lab, Annie, a rub behind the ears.

Here is the magnifier I use with my iPhone, $13.50 plus shipping from Amazon:

https://www.amazon.com/gp/product/B00CMDIOBK

It has a light and batteries and a zippered case. The reticle is 3/4" square and graduated in 1/16" and 0.5 mm. To focus it, you need to put a spacer about 3/32" thick between it and the sample. These samples are bossé, Guarea cedrata, or maybe G. thompsonii, from East Africa.

https://www.trada.co.uk/wood-species/guarea/

These pics have nothing to do with Yellowheart. They are just to show you what you can do with a cell phone and a cheap magnifier. They were laying out on my bench and are very photogenic, have interesting, curly figure, so you can get a view of both rift sawn face grain and end grain. They also have lots of shiny stuff in the large vessels. It's silica, which is why I think it is G. cedrata instead of G. thompsonii.

Bossé from iPhone, wetted with mineral spirits:

Bossé with iPhone and 10x magnifier:

Bossé with iPhone digital zoom and 10X magnifier. I lost a bit of resolution because it isn't quite in focus. I'm going to have to work on it.