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GEM IDENTIFICATION REPORT (BLACK EDITION)

GENERAL INFORMATION
  • Date of Issued23 November 2024
  • ObjectOne polished gemstone
  • Image is Approximate
  • Report Number4529419996
  • SpeciesNatural Corundum
  • VarietyNatural Star Sapphire
  • Weight12.53 Carats
  • EnhancementNo Indications of Heating

ORIGIN INFORMATION
  • Gemological testing revealed characteristics consistent with those of Natural Star Sapphire from:
  • CountrySri Lanka
  • Sri Lanka mines produce sapphire since ancient times, it has been well established by 1292, when Marco Polo first landed the Gem Island. To this day, it is still one of the most prominent sapphire producers in the world. The famous sapphire at the heart of Princess Diana's engagement ring is from Sri Lanka too.

ADDITIONAL INFORMATION
  • Measurements12.85 x 10.86 x 9.99 mm
  • ShapeOval
  • Cutting StyleCabochon
  • TransparencyTranslucent
  • ColorStrong violetish Blue

    The hue's characteristics of this gem earns the color "Cornflower Blue"
  • ToneMedium
  • SaturationStrong
  • Refractive IndexSpot 1.77
  • Specific Gravity4.00 ±
  • MagnificationCrystals, Rutile silks, Orange-stained fissures
  • EnhancementNo Indications of Heating
  • CommentsAny 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-NIR spectrum of this sapphire shows iron-related absorption at 388nm and 450nm. And the absence of broad band at 880nm helps to distinguish the environment this sapphire was formed in.
  • Special Mention
  • The natural star sapphire mentioned in this report weighing 12.53 carats is a rare piece and possesses high visual quality with attractive cornflower blue color which treasured by many gemstone collectors. In addition of the color, it displays a fine and sharp asterism "star" phenomenon. Beyond its beauty, it is free from treatment. Based on these quality traits, it deserves our special mention and appreciation.
  • 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.
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