Geographic Origin Determination of Paraíba Tourmaline | 19th GIA Tokyo GemFest 

19th GIA Tokyo GemFest - recorded live on May 29, 2020.
Available in Japanese language only.
Blue to green copper-bearing tourmaline, known as Paraíba Tourmaline, has been quite popular in the colored gemstone market for the past three decades. This seminar will review its gemological characteristics and discuss GIA’s geographical origin determination.
銅を含んだ青～緑色のトルマリンは、パライバ・トルマリンとして大変人気の高いカラーストーンです。今回のセミナーでは、パライバ・トルマリンの概要に加えて、最新の産地鑑別方法について紹介します。