Is this bracelet prototype too heavy?

[Plasmeo]

Hello,

I just finished modelizing my latest bracelet and i'm about to prototype it.

Volume of the model is 61ml and if my calculation is right that would mean the silver made bracelet weight would be 640,5 grams. That s so much.

How could i modify the project in order to make it lighter without changing shape or style?

Thanks a lot.