Originally Posted by
MIKRON
I think your options for this would be casting, or using a powerful hydraulic press (I'd say 100ton+ - this would depend on the heart size) with some fancy tooling (more mass production). If you were casting I don't think it would be hard to machine a two sided mould similar to that in your link, I think a good grade graphite (zero risk of contaminating your silver/gold - and it would release from the mould easily) would work very well for that (not the same type of graphite used widely in crucibles for jewellery, that graphite is low quality and easily damaged). I'd need to look into it but this is something I could manufacture if there was sufficient interest.
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