Ring metal cost calculator

This spreadsheet will allow you to do a somewhat more apples-to-apples comparison of the value of metal used in a ring before you of to get it made. It doesn't take into account extra manufacturing costs but should give you a ballpark estimate of the raw material cost so you can make sure you aren't getting ripped off etc.

Potentially very useful when combined with the following:
Ring Creation Script http://www.thingiverse.com/thing:12448
Diamond size shape weight conversion Spreadsheet htt