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10.64 ctw Cabochon Mixed Tanzanite Parcel

Currency:USD Category:Jewelry / Loose Diamonds & Gemstones Start Price:1.00 USD Estimated At:800.00 - 1,025.00 USD
10.64 ctw Cabochon Mixed Tanzanite Parcel
Two oval cabochon cut natural tanzanites, measuring 11.50 x 8.50 x 5.53mm, exact total weight 10.64ct., clarity is heavily included, type I, dark, moderately strong, violetish blue color, (GIA vB 7/4), cut is good. Transmitting light somewhat diffusely, transparent to translucent. Naturally occurring internal & external characteristics are present. Measurements & the color grade are an average for the pair. Tanzanite is a very rare gemstone that is only found in the country of Tanzania. Originally discovered in 1967. Tiffany & Company, named the stone Tanzanite. It is found in the Usumburu Mountains that border the Umba Valley of northern Tanzania. Tanzanite occurs in gray, brown, violet, blue, reddish-purple, & green. The gem is interesting because of its exceptional pleochroism. Rotated in different directions a tanzanite will exhibit multiple changes of color. Tanzanite has a low tolerance to ultrasonic cleaning, and should not be cleaned using this method. Westfield Appraised.