Intense green tourmaline, coloured by chromium and vanadium. The only source of gem quality chrome tourmaline known to us is Tanzania. Rumour has it that Burma (Myanmar) also supplies gemmy material, but all we ever saw from there was of mineralogical interest at best.
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Found and cut in the 1980ies
cut: emerald cut
origin: Tanzania
treatment: untreated
clarity: very small inclusions
Somewhat sloppy cut
cut: emerald cut
origin: Tanzania
treatment: untreated
clarity: very small inclusions
cut: emerald cut
origin: Tanzania
treatment: untreated
clarity: eyeclean
cut: marquise (navette)
origin: Tanzania
treatment: untreated
clarity: eyeclean
cut: oval
origin: Tanzania
treatment: untreated
clarity: very very small inclusions
cut: oval
origin: Tanzania
treatment: untreated
clarity: distinct inclusions
Best colour, polish could be better but this still is a very good stone
cut: oval
origin: Tanzania
treatment: untreated
clarity: distinct inclusions
cut: oval
origin: Tanzania
treatment: untreated
clarity: distinct inclusions
cut: pear
origin: Tanzania
treatment: untreated
clarity: eyeclean
cut: round
origin: Tanzania
treatment: untreated
clarity: distinct inclusions