.jpg)
特集
Read More
詳細
Read More
Read More
Read More
Read More
リサーチ＆ニュース
Gem News International
Blue Zircon Reportedly from Malawi
A reported new source of blue zircon in Malawi yields rough material for beautiful finished stones in the gem trade.
Read More
ウェビナー シリーズ
GIA ナレッジ セッション
宝石の起源、ラボラトリー グロウン ストーン、フィールド ジェモロジィでの新しい発見など、今日の宝石学における最も多様で重要な問題に関するウェビナーにご参加ください。
詳細
Micro-World
Chondrodite in Red Spinel from Mogok, Myanmar
The Bangkok lab recently encountered a single round crystal of chondrodite in red spinel, a possible indicator of Burmese origin.
Read More
Lab Notes
Two Antique Mughal Spectacles with Gemstone Lenses
Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory.
Read More
Colored Stones Unearthed
Colored Stones from the Deep
The first installment of this column discusses the formation of colored stones from the crust-mantle transition and below.
Read More
Micro-World
Radioactive Green Diamond
The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of radiation treatment by the use of radioactive salts.
Read More
