My vintage bangle just arrived and it's lovely but I am still stumped as to what it is. I've ruled out jadeite after doing the SD test, so it's likely nephrite or serpentine. I'm leaning towards nephrite because I've seen some nephrite pieces with similar dendritic patterns. The bangle is also nicely polished. It has more lustre than my jadeite bangle which has a bit of orange peel.
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I think it's gorgeous!