Diamond Coated Core Drill Bits

Great for drilling shells and beach glass!


We use diamond core drills bits to cut holes in gemstones, shells, and glass without chipping or cracking. We always use water as a lubricant. They have a 3mm or 1/8″ stainless steel shank.  They fit the motorized bead reamer AND the flex shaft.

We have 4 sizes: 1.5mm, 2mm, 3mm and 4mm

1.5mm is Michelle’s fave, and fits a 18 gauge jump ring.  Great for delicate shells, and sunrise shells.

2mm sells well,  and is Jamie’s fave, cause it fits a 16 gauge jump ring quite nicely and I love chunky jewelry.

3mm is Jason’s fave cause the shank and the drill bit are the same diameter – so it’s easy to drill with!  Perfect for large gauge bangles that need big hole pearls!

4mm is great for cutting through thick beach glass and ceramics.  Handy to have and may last you a while cause it’s super coated and big! 🙂  We carry this at the request of our ceramicist friend, Erin!

Sold in PAIRS or try all 4 sizes (one of each) at a discounted price!