GEMOLOGICAL REPORT                                                       № 145
  Gemologist Olga Melikian | WA: https://wa.me/79990437349                          06/10/2026
  Telegram: @olgamelikianofficial | https://melikianjewelry.com                     


  Weight: ……………………………..……………………..…..  19.13 ct
  Measurements: ……….…………..……….   18.70x14.30x10.15 mm
  Сut: ……………………………………………..………….….   cushion
  Color / Saturation: …………….. vivid greenish blue | medium color
  saturation ……………………………………………………………….. 
  Clarity: …………………………………..…………… slightly included


  IDENTIFICATION: …………………….……  Natural TOURMALINE

  TRADE NAME: …………………………… PARAIBA TOURMALINE 


  Geographic Origin: …………………………  Mozambique (Mavuco)

  Treatment: …………………….…………….……….   Heat treatment


Information about PARAIBA TOURMALINE: 

This cooper and manganese tourmaline is called «Paraiba   tourmaline» in the trade. This gemstone is very rare and valuable. Blue Paraibas with a strong neon glow are especially valuable.


RESULTS OF DIAGNOSTIC METHODS
10x Magnifying glass: ……………………………………………….…
  A series of gas-liquid inclusions, there are micro-cracks visible from the
  pavilion side, no planar or large cracks, no chips, no faceting defects.
 100% transparency. Strong neon.
  Refractive Index: …………………………………….… 1.620 - 1.640
  Polariscope: ………………………………………..…….. anisotropic
  Dichroscope: ……………………………………………………………  
  UV fluorescence: …………………………………… no fluorescence
  Chelsea Filter: …………………………….…………………………….
  Color change | Alexandrite effect (daylight | artificial light): …….no
  Microscope: A series of mineral inclusions and gas-liquid inclusions 
  are observed.  Traces of heat treatment are visible. No other types 
  of treatment were detected.   

DETAILED GEMOLOGICAL COMMENT

To accurately determine the mining region, the gem report should be supplemented with  Raman microscope study, obtaining the spectrum of this tourmaline Paraiba, and comparing it with the base spectrum of tourmaline Paraiba from Mozambique.

The characteristics of this Paraiba tourmaline:

  Weight: ……………………………..……………………..…..  19.13 ct
  Measurements: ……….…………..……….   18.70x14.30x10.15 mm
  Сut: ……………………………………………..………….….   cushion
  Color / Saturation: …………….. vivid greenish blue | medium color
  saturation ……………………………………………………………….. 
  Clarity: …………………………………..…………… slightly included
  Geographic Origin: …………………………….………  Mozambique
  Treatment: …………………….…………………..….  Heat treatment