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Well I was wrong once before ....... make a slurry on the BBW side, or whatever it is ..... and if it is purple, chances are it is a natural stone. I have seen a synthetic that looked like that years...

In my experience it is not unusual to find a coticule with a "jagged" line of transition. In fact there is another thread current on SRP with one that is very like that. I would bet it is a coticule....