Reply To: First Sapphire problems › Forums › Beginner Questions › First Sapphire problems › Reply To: First Sapphire problems September 1, 2019 at 1:49 pm #5584 DavidRillingParticipant @DavidRilling 600-3k or8k- polish works great. Just transferred a small Montana sapphire last night. When you are roughing the stone just stay away from anything in the 1200 range and you’ll be fine