Source for unusal BIG stones

Hello all–

I am very new to this list, and now look forward to my e-mail every
morning. What a wealth of talent and knowlege out there! I’m a
flegling jewelry designer–I have a line of gemstone and sterling
jewelry designed in support of environmental and conservation
programs through the Rare Species Conservatory Foundation
(www.rarespecies.org). Anyway, I use large, freeform stones like
matrix opal, agate and jasper for pendants and would like to know if
any of you have a favorite source for unusal BIG stones (50mm and
up). Thanks!

Karen McGovern
RSCF