Density of commonly used jewellery alloys and elements
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To convert the weight of a known alloy to the weight of another alloy it is a simple matter of comparing the densities of the alloys and can be expressed by the following formula:  For example, to find the equivalent weight of an article in 9ct Yellow when the known weight is say 50gms in 18ct Yellow:  For example, to find the equivalent weight of an article in 18ct Yellow when known weight is say 50gms in 9ct Yellow:  Gold Alloy Fineness 
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Area and volume calculations
Common elements
Ring blank length calculation
