Based on our own experience this diamond-coated lapidary needle is a game-changer when it comes to precise hole cutting. The needle is durable, works efficiently, and provides a clean finish. It's ideal for working with delicate and hard materials and large stones .However, it's not suitable for larger holes, and it requires a LITTLE patience to get the desired outcome. Nevertheless, it's a must-have in every jeweler's tool kit, and we highly recommend it..