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GEM IDENTIFICATION REPORT (BLACK EDITION)

GENERAL INFORMATION
  • Date of Issued11 March 2024
  • ObjectOne faceted gemstone
  • Image is Approximate
  • Report Number3621264273
  • SpeciesNatural Tourmaline
  • Weight24.10 Carats
  • EnhancementColor origin is currently undeterminable*
    *See Disclosure Notes for more information


ORIGIN INFORMATION
  • Gemological testing revealed characteristics consistent with those of Natural Tourmaline from:
  • CountryMozambique
  • Copper-bearing tourmaline discovery in Mozambique is relatively new, it was first discovered in 2001. Wide variety of colors has been recorded in the findings including the rare deep purple and violetish blue hues.

ADDITIONAL INFORMATION
  • Measurements19.22 x 16.55 x 11.05 mm
  • ShapeOval
  • Cutting StyleFancy
  • TransparencyTransparent
  • Colorgreenish Blue
  • ToneLight - Medium
  • SaturationMedium
  • Refractive Index1.624 - 1.644
  • Specific Gravity3.06 ±
  • MagnificationThin-films
  • EnhancementColor origin is currently undeterminable*
    *See Disclosure Notes for more information

  • CommentsThis copper and manganese bearing tourmaline is known as "Paraiba Tourmaline" in the trade.

    Any statements on origin is an expert opinion based on a collection of observations and analytical data.

IMPORTANT INFORMATION
  • Tested withUV-Vis-NIR Spectrometer
  • The UV-Vis-SIR absorption spectra shows the tourmaline has absorption at around 700nm, which is the absorption by traces of Fe2+ or Cu2+ that produces greenish blue color in tourmaline. Thus, absorption around 900nm giving out information to distinguish coloration by Cu and Fe and to estimate the copper content.
  • Special Mention
  • The natural tourmaline from Mozambique mentioned in this report is known as "Paraiba Tourmaline", distinguished by its copper content. With its exceptional wieght of 24.10 carats, making it a true rare piece. The gemstone's amazing lustre and great cutting, giving the stone a beautiful scintillation. Such a visually appealing piece worth our special mention.
  • Examined by Global Gemological Laboratory team of experienced gemologists (GG from GIA, AG from AIGS)
Tested and examined by GlobalGem Group of qualified Gemologists comprising members from GIA (GG) of America, Gem-A (FGA) of United Kingdom and AIGS(AG) of Asia.
Disclosure Notes, Limitations & Disclaimer
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