Opal body tone and brightness scale dark-opal Bodytone is N1 and Brightness

Bodytone is N1 and Brightness is B4

Larger green black opal

crystal opals have such nice color the brightness is shown in the scale of attribute below near the video

This high domed gem light opal is perfect for a ring setting

Opal body tone and brightness scale dark-opal Bodytone is N1 and BrightnessSick 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 created 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 worldwide. The brightness is