and if you have an ebay account you can get the disc’s cheaper from china including shipping may take up to 4 weeks but worth it on cost savings. i get my diamond polishing poweder through ebay (glass-polisher) seller for 1000 carats for $80 = 10 shipping and fairly fast shipping. thats 9 cents a carat. and we apply it with finger tip–small amount so it goes a long ways.