Goggles Protective

How to pierce a hole in an obsidian disk?

I have this obsidian disc (1 inch diam for about 1/8 high) found somewhere in an indian market at Mexico. My wife would like the disc in a necklace but I am afraid I may broke it. I've tried with a tiny metal & wood drill at a very low speed and with the same drill on a high speed mototool without a single scratch on the disc.
What kind of tool should I use. I think a diamond drill may do the work but I could'nt find one at my local hardware store.

I love making natural stone jewelry! I have a big exhibition coming up only instead of at a store it's at an art gallery because the curator of the gallery bought a couple of things and loves them and thinks they are "art" and not "fashion" You might be better of with something a beadworker calls a "bail" it's easier than drilling and less likely to wreck your stone. But first let's look at lapidary drilling.

Obsidian is very hard and difficult to drill. Lapidarists will use a special bit on a high speed dremel type drill (30,000 rpm minimum) to drill stones such as obsidian and they will also use a lubricant (oil and water emulsion) to keep the stone cool and to prevent the grindings from flying everywhere. Some will drill with the stone immersed in water. Lapidarists also wear safety goggles, protective breathing mask, and protective gloves. If you have a high speed dremel you can get fine drilling bits made for drilling semi precious stones, one guy I know uses dentist's drill bits. Use a bit of 3 in one oil mixed with water, plain water, or bath oil (avon skin so soft is almost perfect) to keep the area clean and cool. Do wear proper safety equipment. You still risk breaking the stone if there are inclusions or faults inside the stone.

Alternately, and what I use, is a glue on bail glued to the top of the stone You can get bails in many sizes and if you use E6000 (gel type super glue) or jewellers 2-part epoxy the metal bail will be firmly stuck to the stone. This is easier, less expensive than a high priced dremel bit and less likely to wreck the stone. For really large and thick stones I always glue on bails rather than drill. Here's a couple glue on bail webpages: http://www.beadalon.com/BaseBails.asp and finer mountain has hundreds of bails for circles and donuts: http://www.firemountaingems.com/findings.asp#Bails
http://www.firemountaingems.com/shopping.asp?skw=KWCTFNBAILDONUT
This is my favourite bail for donuts and circles: http://www.firemountaingems.com/details.asp?PN=H204177FD
It also comes in a dolphin shape: http://www.firemountaingems.com/details.asp?PN=H204173FD

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