Which country is the best supplier of gemstones?

I am looking to purchase gemstones in bulk? Which country is the best to look into? It can be lab created gemstones as well.

Dear Sir,
I invite you to discuss your question to me, many gemstone there is just in to Russia.
Please write me on bk222bk@inbox.ru or bk444bk@inbox.ru
Thank you, Best regards, Alexandr Rumiantsev