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My suggestion would be to consider diamond cutting tools as an option. Water works well as a cutting agent and adding a drop of dish soap also helps. I've drilled scales submerged as well so no dust which makes clean up nice since I just pour that into the yard. This works well for stone which is why I use it for MOP.
Typical bits can fracture or cause the MOP to chip-flake out due to the flute design where diamond abrades rather than "cuts" through, leaving a clean hole. Just have to have a more gentle feed rate as the diamond can do the work.
Turquoise is pretty soft and easy to work, similar to marble where no specialty tools are necessary. Diamond makes it easier if available. AO abrasives are sufficient though I would suggest silicon carbide to grind them wet and reduce dust. Same with MOP.
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Mike 
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