In your utopia, If you have small diamonds for money what would you call the money? It can't be diamonds

I'd probably refer to them as something to do with their shape or color but not a known word to make it original - maybe a mixture of two?

Such as, alphires, gemphyx, or just a combination of anything.

I feel creating your own word rather than using a word that has a meaning would make it seem like an actual new item rather than diamonds.

I would probably call them crystals