I've been doing business with the Bell group for over 30 years They are the ones that own Rio Grande Albuquerque, They are a bit higher on most of their tools and materials But they are above reproach. It was started back in the 40s today it is probably the largest Jewelers supply company in the world, seconded by Stuller in Louisiana, that is a hard group to deal with!
The reason I initially recommended Indian Jewelers supply they are still a fairly small company they probably don't do over 3 to 4 million a month, Rio does that in a day.
I've known the Bell brothers, and their late uncle Saul, for a long time, although I haven't seen them since we moved from Santa Fe back in 91.
I doubt if Rio carries any rough gem material any more, they pretty much quit after they lost several million dollars in diamonds and other gems to some thieves in the mid 80s, after that they built their new secured gem and metals department on the third floor of their new building and placed their tool sales about three blocks away.
Their current Gems and findings catalog doesn't list any rough material other than Gilson Lab created Opal and some Paua shell.
The reason for wanting the information is simple, They sell to Jewelers world wide, Students of the arts and Retailers.
They really don't want some guy trying to buy a trinket for his lady at wholesale which will hurt one of it's serious customers, it's like some one comes to you and says I'd like a price on 20 pens, you give them a decent wholesale price, then they try their best to get you to sell them ONE PEN at that price.
better yet go direct to Colbaugh turquoise co.
http://www.colbaugh.net/ Last I heard the could supply you with sizes up to several hundred pounds.