I have acquired a large quantity of otoliths, the hard ear bones of a fish, which I would like to drill for use as beads. But they are very hard, and very brittle, and they always shatter when I try to drill them will a conventional electric drill bit.
Generally drilling of extremely hard materials is done at (relatively) low speeds, often with fluids and abrasives, however, unless this stuff is fossilized a standard diamond or carbide bit ought to make short work of it.
See what drill bits and techniques gemologists use. It should suffice for your purposes.
I’ve found Moto-tools to be an excellent way to melt expensive, small drillbits, such as the diamond bit I linked to. Slow is the way to go with hard, brittle objects.
Diamond drill bits are the way to go. Add 2 or 3 small drops of diswashing liquid to a cup of water to use as a cooling agent. Slow to moderate speed gets the job done.