The web-site is terrible to navigate and purchase, but the products are good and I would highly recommend him for natural stones. His descriptions of how the stones perform are spot on. His prices are lower than any other on-line retailer for very specific geographical locations.
I do believe that his stones are probably the best you can find on-line unless you consult with Ken Schwartz. Just thought I'd throw that out there. Just be sure to splurge a few extra bucks for shipping otherwise you won't see what you bought for many, many weeks. I had a paypal problem and it delayed shipping. Metal Master upgraded my shipping free of charge and I had my stone in about two weeks.