Laying marble tiles on floor

I have some marble tiles I wish to put on a floor. I have been informed these should be laid with "NO" grout joint at all.
QUESTION - do you really lay them with ZERO gap between the tiles, literally, or lay them with MINIMAL gap (and space with something like a toothpick)?
I then understand one grouts with non-sanded grout.
Any hints for this would be much appreciated.
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I have always laid Marble tiles with minimal gap. You want your floor to look natural as if it is one piece of Marble. I now do it by eye but did use finishing nails when I started. A little secret of mine with the grout is to use non-sanded and to use two different colors. Use the color you prefer (Grout A) and fill in all the seams, then take another color (Grout B), one that matches the feather detail in the Marble and go over the grout lines in places where you see that the grout line has caused a break in the flow of the grain from one tile to another. I usually just remove some of grout A from the seam and fill in with some of grout B. I think it makes a big difference. Try it, you have nothing to loose, you will see the effects before the grout dries - if you like it keep it - if not put grout A back in.
I have also sprinkled some of another color of grout over grout that was in a seam and not yet dry. It gives the grout line a faux paint look - it turns out nice also.
Good Luck
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Thanks! I was getting ready to lay them and thought that laying them with *NO* gap might be terribly unforgiving of mistakes. I will try the finish nails idea (I was thinking toothpicks but the nails will be easier to get out if they get stuck and won't compress). What do you suggest? 4dd? I'm not to the level of using my eye just yet :)
Thanks for the grout ideas. I like them and will try it.

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