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The brightness is simplified into 5 levels to support the measure of an opals brightness(B)
What you get: 2 x approx
this one holds strong through both winter chills and summer heat
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
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