Clyde, I purchased some rough from Tanzania about a year ago that
sounds just like the stones that you have. The main difference was
the size, all cut under 1.5 carats.
I have also seen several Mali garnets that exhibited a nice though
not dramatic color change. Many garnets do have a color change,
though it is not overly strong and I prefer to call it a color shift.
There is a lot of color change garnet out there that people just
don't recognize. I have cut a couple of stones from Colorado that
were spessartites. They had a change from orange to gold. There are
even some coming from Tanzania now that have a true red to blue color
To my knowledge all color change garnets have at least one other
significant garnet component to them, usually spessartite or
andradite. (Mali garnets are a mix of grossular and andradite).
Hope this helped.
Custom cut/designer gemstones