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Green-Yellow, Orange, Brown Tourmaline

a fine patette of natural colors
 
colors available   green, green-yellow, olive, brownish-green
yellow, yellow-orange, brownish-yellow
orange, brownish-orange
brown, orangey-brown
family/species:   tourmaline, dravite and tourmaline, elbaite
properties:   RI=1.624 (+/-0.005) and 1.644 (+/-0.006) DR
SG=3.06 (+/- 0.05)
dispersion=0.017
hardness=7-7.5

suitable for use in jewelry

pyroelectric - becomes electrically charged when heated
piezoelectric - becomes electrically charged when squeezed
many modern higher-end hair dryer use tourmalines in them to prevent static!
treatments:   usually none
important information  

dravite gems are colored by chromium and vanadium;

elbaite gems are usually colored by manganese, but also by color centers within the crystal structure
chrome/vanadium bearing dravite gems in green-yellow-orange and brown colors are 100% natural with no known treatments or enhancements;

elbaite gems can be 100% natural with no treatments or enhancements, or heated, or irradiated and heated 

(see policy on Treatment Disclosure)

birthstone:  

october

anniversary:  

8th

cuts:   calibrated up to 5mm
all standard cuts and free sizes
rough:   generally available in clean material to cut sizes 4mm and under; bigger pieces occasionally available - please Contact Us for current stock
mining:   chrome/vanadium bearing dravite is found only in in tanzania (landanai, morogoro, umba valley) and kenya (taita-taveta)

elbaite is found in brazil, nigeria, mozambique, zambia, afghanistan, usa, and other localities worldwide

Photo Gallery: Selected Green-Yellow, Orange & Brown Tourmalines

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