Moss Aquamarine and Moss Amethyst are natural occurrences. Rare, but
natural as far as I know. I have some of both.
Be careful “stocking up”. You can end up with a lot of something you
like, but necessarily what your customer base likes. Been there,
done that. It is tempting though, because you are right. They come
and go never to be seen again.
I stopped by your site to see what quality gems you use. I know you
didn’t ask about this, but pop-ups are a no-no on a fine jewelry
site. Lovely designs, beautiful colors though.
Lastly, my best advice is invest in an electronic gem tester. It
will tell you exactly what it is, good enough for beads. I have a
Presidium one, worth every penny.
Best of luck,
Couture Artisan Jewelry ™