Is there a formula to calculate the approximate weight of a ring

blank with a known ID, OD, width, height, metal/karat, etc.?

I am trying to make a database from a few known weights (usually

sizes 6 and 10). When I try to use excel, for example, to make a

formula, I notice that it is not a set percentage increase or

decrease. (what I did was take a size 10 and the percentage

difference of that from a size 6…then divided it by 4 to get the

average % between sizes…however when I try to go from a 6 to a 7 or

7 to an 8 for example using those #s, it doesn’t work) Also, I have

noticed, that the rounded outside rings are different than the flat

outsides, and the comfort fit are different from the flat insides,

and so on.

I know that it is very unlikely there is a definitive formula, and

since Im not a mathemitician Im not even sure how I would go about

starting this. But there has to be some sort of geometry formula with

area, cicrumference, taking volume of metal, etc into account where I

could get a close approximation.

Any help would be greatly appreciated.