That black patch looks much darker than the bbw. A pool of manganese?
Yes, I think there could be manganese mixed up with BBW. The BBW looks almost black at the last photos, I think this is due to the lighting (halogen) and some dirt or dust on the stone. In daylight, the back of the stone looks more like a BBW than a Dragon´s Tongue , but is still very dark. The black patch is really black, but in sunlight, it has a bit metallic blue in there.That black patch looks much darker than the bbw. A pool of manganese?
Where did you get this info? I’ve heard very little about the Burton Rox era stones but one of the things was that the glue joints were usually very tight.The yellow glue and the BBW backing shows, that it is a stone from Burton Rox.
View attachment 1015224 The Burton series was a short run of “exceptional” stones around 2009 IIRC. They looked something like this
Nice looking Coticule, I need oneView attachment 1015224 The Burton series was a short run of “exceptional” stones around 2009 IIRC. They looked something like this