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The body tone(N) values have been measured by Anthony Smallwood – the author of the official grading system used worldwide
The brightness is simplified into 5 levels to support the measure of an opals brightness(B)
Bodytone is N3 and Brightness overall is B2
This stone looks especially fetching at night – a perfect companion for diamonds
Nice red colors in this black opal
213 ct Beginners Rough Opal with Video Tutorials rough-opal The body tone(N) values haveStart here if you are new to opal cutting! Along with your rough opal, we will send you a series of video tutorials covering how to set up your equipment, how to get the more our of your parcel and most importantly a series of 4 lessons on how to cut. These videos are exclusive to our customers and are not available anywhere else. Each parcel is individual and you will get the exact opals in the images.
