カッラーラ大理石に関して編集された注釈付きの書籍リスト

中国本土と香港における新型コロナウイルスの経済的影響。また、ダイヤモンド市場とゴールド ジュエリーに関する最新情報も報告します。

GIAの科学者たちは、ダイヤモンドのタグ付けおよびダイヤモンドのグレー～ブルー～バイオレットの色の原因に関する最新の研究成果を発表しました。

ナミビア産の漂砂ダイヤモンドに関して編集された注釈付きの読書リスト。

In some cases, the value of a sapphire depends strongly on its geographic origin. This article details the origin data GIA has collected for blue sapphire and describes its methodology for using the data in geographic origin determination.

With more than 90 field expeditions on six continents since 2008, GIA has accumulated over 22,000 colored stone reference samples. This extensive collection of colored stones with known origins supports GIA’s research on geographic origin determination.

The world ruby market has undergone dramatic change in recent years, especially with the development of ruby mining in Mozambique. This contribution outlines GIA’s methods and criteria for establishing the geographic origin of ruby.

Over the last two decades, knowledge of the formation of gem deposits has improved significantly. This article reviews the state of our knowledge of the geology and genesis of gem corundum and emerald deposits.

The relative chemical diversity of emeralds from different deposits worldwide allows clear origin determination in most cases. This contribution explains the criteria used by GIA to make geographic origin conclusions for emeralds.

The geographic source of this rare color-change gem has a significant impact on value. Trace element chemistry profiles allow GIA to accurately determine origin for alexandrite from several countries.

GIAがカラーストーンの起源をどのように判定するか、そしてダイヤモンドの起源の謎について、James Shigley博士が説明します。