Diamond carat weight reference tool with cubic zirconia reference stones.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...l_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...eight_tool.jpg
Previously:
https://www.homemadetools.net/forum/...573#post132451
https://www.homemadetools.net/forum/...630#post166986
