Cutting mosaic effect tiles

What is the best tool for cutting mosaic effect tiles its the ones with the dummy grout lines, I cant see a standard cutting scribe holding a straight line.
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I did this with 12" mosaic effect with false grout lines just used a normal 'Plasplugs' type cutter. No problem at all apart from, like always, if you need to cut a thin section off of one edge.
HTH
John
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