A: Hi there, thank you for your order & giving us the opportunity to serve you! I received your question about the diamond coating and the inability to see it. The very tip of the bit is where the diamond coating is located. You won't be able to see it easily due to the fineness of the coating and the yellow color. However, you can feel the gritty texture by lightly running your finger over the top of the bit.

I hope this information has been helpful! Please let us know if you have any further questions, we would be happy to assist you!

Jo