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          Brazilianite Value, Price, and Jewelry Information

          Faceted brazilianite, 12.2 cts, 1.9 x 1.0 x 0.7 cm, Corrego Frio mine (type locality), Linopolis, Divino das Laranjeiras, Doce valley, Minas Gerais, Brazil. ? Rob Lavinsky, www.iRocks.com. Used with permission.

          Brazilianite

          Brazilianite’s lovely green to yellow colors make it a must for gem collectors. Large faceted stones are often flawed, but smaller cut gems can make beautiful jewelry pieces.

          Brazilianite Value

          The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

          Brazilianite Value via Gem Price Guide

          Accompanying value information:
          Not found
          Faceted 1 carat plus
          to /ct

          Brazilianite Information

          Data Value
          Name Brazilianite
          Crystallography Monoclinic. Crystals equant, prismatic, spear-shaped; also striated.
          Refractive Index 1.602-1.623
          Colors Colorless, pale yellow, yellowish green, greenish.
          Luster Vitreous.
          Hardness 5.5
          Fracture Conchoidal
          Specific Gravity 2.980-2.995
          Birefringence 0.019-0.021
          Cleavage Good 1 direction
          Dispersion 0.014
          Heat Sensitivity Yes
          Luminescence None
          Luminescence Present No
          Transparency Translucent to transparent.
          Absorption Spectrum Not diagnostic.
          Formula NaAl3(PO4)2(OH)4
          Pleochroism Weak, merely a change in shade of color.
          Optics α = 1.602; β = 1.609; γ = 1.621-1.623. Biaxial (+), 2V = 71°.
          Optic Sign Biaxial +
          Etymology After Brazil, where the gem was first discovered.
          Occurrence Hydrothermal mineral in pegmatitic cavities.
          brazilianite - linopolis

          Brazilianites on matrix, 10.0 x 7.5 x 7.2 cm, Telirio Mine, Linopolis, Minas Gerais, Brazil. ? Rob Lavinsky, www.iRocks.com. Used with permission.

          Comments

          Discovered in Brazil in 1944, large uncut brazilianite stones reside in many museums. Pieces such as these could yield large gems, but clean faceted gems over 15 carats are a great rarity. They also make stunning crystal specimens.

          Yellowish green brazilianite, 2.23 cts, 8.7 x 6.8 x 5.4 mm, cushion cut, Brazil. ? ARK Rare Gems. Used with permission.

          Sources

          Brazil, notably Conselheira Pena, Minas Gerais, remains the principal source of gem quality material in crystals up to large sizes. The Palermo Mine in Grafton, New Hampshire and sites in Yukon, Canada also yield fine but smaller specimens.

          brazilianite crystals - Canada

          Brazilianites, Rapid Creek, Yukon, Canada. ? Rob Lavinsky, www.iRocks.com. Used with permission.

          Stone Sizes

          Crystals from Brazil range in size up to 12 x 8 cm. Although some large gems have been cut, most gems range from 1-10 carats, or even smaller. Cut stones over 5 carats are scarce today.

          brazilianite - New Hampshire

          Some of the sharp, yellow brazilianites inside this quartz vug reach 1.1 cm. That’s very large for this locality. The specimen measures 10.8 x 10.3 x 8.9 cm. Palermo Mine, North Groton, New Hampshire, USA. ? Rob Lavinsky, www.iRocks.com. Used with permission.

          • American Museum of Natural History (New York): 23 (emerald cut, Brazil), 19 (round, yellow).
          • Smithsonian Institution (Washington, DC): 41.9 and 17.0 (yellow, Brazil).
          • Private Collection: 24 (yellow, Brazil).
          Cut brazilianites - 0.78 and 2.00 cts

          Cut brazilianites, 0.78 and 2.00 cts. Photo ? Joel E. Arem, PhD, FGA. Used with permission.

          Care

          Heating brazilianite gems up to 140o C/284o F can lead to color loss. Heating up to 300o C/572o F will turn them colorless. A jeweler’s torch will easily reach these temperatures, so be wary if you’re taking?a jewelry piece for repairs. Although brazilianites have a moderate hardness, they also have good?cleavage and a tendency to?fracture. Thus, protective settings and occasional wear are good ideas. Avoid mechanical cleaning such as steam or ultrasonic processes. Instead, use a soft brush, mild detergent, and warm water for cleaning. Consult our gemstone jewelry cleaning guide for more recommendations.

          Brazilianite - faceted gems

          Brazilianite: Brazil, (3.0, 2.7). Photo ? Joel E. Arem, PhD, FGA. Used with permission.

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