Diamond-shaped ice-mold

I generally like the idea of this diamond-shaped ice-cube mold as a fun freezer-toy: I wonder if the ice-diamonds will keep if you make one, pop it out and leave it in the freezer, then make another. It'd be cool (so to speak) to have a bathtub full of these, is all I'm saying.

Diamond Ice Mold

(Thanks, Rina!)