Opal Body Tone and Brightness Scale The brightness is simplified into

The brightness is simplified into 5 levels to support the measure of an opals brightness(B)

This green dopping wax stands out as the best on the market—and the best of all wax colors

It also has a millimeter measurement down the side to measure your opal when grading them

Sick of trying to guess what the body tone and brightness of your opal is

giving you a reliable grip no matter the season

Opal Body Tone and Brightness Scale The brightness is simplified intoSick of trying to guess what the body tone and brightness of your opal is? Now you can accurately measure from a calibrated scale. This scale has been designed by Black Opal Direct with a durable plastic material and is compact to ensure you can take it anywhere. It will help you grade your opal with ease only to be used as a guide. The body tone(N) values have been measured by Anthony Smallwood the author of the official grading system used