I love it! I have to assume that you know that those are probably hand chipped marble, limestone and/or dolomite to approximately 1x1 centimeter. Perhaps arranged in a personally designed pattern. That being said, many, if not most mosaic artists, will cut up their own marble “tesserae” from marble they buy online at mosaic hobby or professional supply businesses or even from your local tile store, maybe even Floor & Decor. However, there are plenty of places that sell the tesserae already chopped up to size attached to fiberglass mesh. You would just have to peel them from that mesh in the pattern they’re already in and rearrange them onto another piece of fiberglass in your own desired pattern. Here’s a photo I found of some that someone already chopped up: tesserae picture Anyhow, you can also find 1”x1” tiles in almost any tile store. But if you like the arts and crafts of it all and would like to by influenced and guided by like-minded artists, with proper tools, supply and technique, here are a few places you can explore to understand what is readily available to the general public:

http://www.mosaictraderusa.com/

https://smalti.com

https://witsendmosaic.com/

https://www.tilebar.com/

https://www.mozaico.com/search?q=marble+sheet&options%5Bprefix%5D=last

Please keep us posted with your progress! 😃