Sources for bigger gemstones

Hi, I did a search for this question, but I can’t seem to find the
answer. I just got started making jewelry (a few pairs of earrings, a
necklace), an d I’ve been buying most of my stones and gemstone beads
from ebay. I notice a lot of other jewelry makers on ebay have access
to bigger and cleaner st ones that I have been able to find, even
after doing searches for wholesale stones, etc. Is there a wholesale
source I’m missing, or would they be cut ting their own stones to get
10mm and above? Any help would be greatly appr eciated, thanks.

Xanadu