Mineral: Bi-color or watermelon tourmaline
Locality: California, USA
Dimensions: 17.7cm x 5.08cm (2.2lbs)

Description: While this gem has the green sheath covering of a watermelon tourmaline, its inner core is banded like a bi-color. The image is back-lit, but the color continues further up the spear, then goes dark, reoccurring as green in the top 1". I would appreciate any information the group may have on this type of tourmaline.

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