The amount of grout you needs depends on your tile size and the GROUT SPACING you plan to use. No one can estimate how much you will need without this information.

This is the grout you're asking about used in a 1/2" x 2" glass tile mosaic application with significant tile spacing (i.e. uses a lot of grout). With this type of application you might cover 20 sf with a 9 lb bucket with no waste.

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Keep in mind that A. most MOP mosaic tile has very little if any grout space, so you won't notice the grout, diamonds or not, and B. this grout was engineered for glass and metal tile not MOP, so you have to make sure the aggregate they use won't scratch the tile. If you can afford to use it and it will work with your tile, it looks fine to me. The best feature of the product is that it is self sealing so it'll save you a lot of effort down the road. Let us know how it works out for you.

The site says the MOP is shell glass. The samples seem like it could be real shell, but for the price, seems too cheap. Hmm. I'd guess the spacing is 1/8" on 1" square tiles.

Cost isn't really an issue- small kitchen, small wall space = getting more high end goodies within budget. Fingers crossed, I never plan to redo another kitchen in my life. I will say those photos do look interesting- I think I'm turing into a bt of a sparkle nut. For years I swore I'd get granite or quartz with the sparkle- and I picked out something without any- now, I've looked at every sample of backsplash tile with glitter, foil, shimmer & glitz. The MOP work well with my countertop and cabinets, just wondering about the extra ummph with that grout.

Here is a link that might be useful: What I plan to use