Can anyone help me figure out what drill bit to use to drill a 3/4" hole in a glass block?

I am making some glass block decorations and need to drill a 3/4" hole in the bottom to string lights up into. Please help! Thanks.

Use a diamond plated core drill bit with diamond coolant .Run drill around 1400 - 1600RPM.
Be sure the drill is running concentric and the machine's chuck has no wobble.
Use a medium pressure, feed the drill into the glass for five seconds, then back up the bit to allow coolant to flow into the cut. Lower the drill with medium pressure again for five seconds. Keep repeating until you are almost through the glass, then lighten up on the pressure and ease the bit through the last piece of the glass to reduce breakout. Note: a hard surface under the glass (hard board or wood) reduces breakout.
If you can't find it locally - look on line and you'll find what you need.

The equipment required would probably cost more than taking the block to a glazier and having them do it. If possible that is. Drilling holes in glass is tricky at best.

you will need a diamond tipped bit. be careful and wear safety glasses when doing it.

Glass is cut with diamond bits as said before. A 3/4" bit would cost in the range of $100, (forget the home centers, they don't carry them) so having a glass company do it for you is by far the best idea. Just mark the spot and take it in to most any glass shop. I would expect to pay much less than $20 for a hole.

You will need a special drill bit and a very steady setup to do this properly. The technique also depends on the type of glass.

Truly, its best to save yourself time (and possibly a little heartache) by finding a harware store that can do it for you.

Good luck

i tried a heated redhot pointed steel with about 1/4 dia in a glass block before and it went thru, but a 3/4 dia, maybe you try from smaller dia until you reach youre goal, but be very careful,

i setup the glassblock so that it wont wobble,

I am with "diver" get the professionals to do it. If they screw up they have to do it again.
If you try and fail you have to buy anther one.

You will need a diamond bit and they are not cheap.

go to home depot and they should have specal drill bits to drill through glass. i forgot what there called but , if you talk to some one there they should be able to help you

What you need is an abrasive hole drill, you might be able to find one at your local home center but if you can't I would advise you to start calling some glass companies in your area.