Working out metal casting cost from Silver Master

[Gold grace]

Hello Can anyone please help tell me the formula or any more info about working out a cost from a silver master to cast in different metals
For example how can I roughly work out how much a silver ring which weighs 7.9 would cost in platinum? or in palladium for example

Thank you for your help :)

[josef1]

You need to find the metals specific gravity and use that plat would be about 15.2g ruthenium and 15.7g in Cobolt depending on the alloy for 7.9g in silver. work out the cm3 weight then multiply by specific gravity of the metal