A Diamond Core Bit, comes in various sizes, recommend the Sutton Brand, top shelf almost impossible to get any better, although relatively expensive as 76mm m14 bit at bunnings is priced at about $150, but you did ask for best drill bit
We have just cut holes in our ceramic tiles for taps etc using the diamond coated hole saw as suggested by JPM, however we certainly didn't spend that sort of money. My husband ordered some online from China for about $3 and they did the job perfectly. Unless you do it for a profession, I wouldn't spend that much on something you will use like 10 times.
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JPM Creations
RussForfatter
Fort Interiors - Renovation Specialists
John Henson
Country House Gal