この「Harmonic Couple: Luan and Phoenix (ハーモニックカップル：ルアン&フェニックス)」というネックレスは、鮮やかな真紅色の珊瑚を特徴としている。 デザイナーはルべライト（紅電気石）を ...

图 1：含有一种称作铁方镁石深色内含物的含硼蓝色钻石，作为此项研究的一部分进行了检测。这颗宝石重 0.03 克拉。摄影：Evan M. Smith（埃文·M.·史密斯）。 这是《自然》杂志中发表的文章 ...

GIAに宝石をご提出いただく場合は、ラボサービスアカウントを開設していただく必要があります。アカウントはすべてオンラインで簡単に開設していただけます。 アカウントを開設するため ...

GIA’s laboratory in Bangkok, Thailand conducts research and provides services such as diamond grading and origin determination, colored stone grading and origin determination and pearl identification ...

The People's Republic of China has recently placed a high priority on identifying and developing its gemstone resources. Initial exploration by teams of geologists throughout China has identified many ...

Surface-treated topaz has become a viable alternative to topaz colored by irradiation. Unlike irradiation, which modifies the entire gemstone, coloration by chemical modification is limited to the ...

Synthetic diamond growth was first documented in 1952 by William Eversole of the Union Carbide Corporation, but it took another two decades before GIA issued the first grading report for a ...

This article traces the use of pearls from antiquity to the initial appearance of cultured pearls in the 1920s. The first section touches on the early fascination with pearls as revealed through ...

The Chinese have labored to perfect the art of gemstone carving for several thousand years. Beginning with primitive tools and limited materials, they eventually developed the iron-tipped spindles and ...

Demantoid, green andradite garnet, was discovered in the Central Ural Mountains of Russia in the mid-19th century. A favorite of the Czar's court, demantoid was another victim of the 1917 Bolshevik ...

瑞々しい青、鮮やかなバイオレット、濃い紫色のバランスを整えたエキゾチックなタンザナイトが発見される場所は、地球上でただ一つ、雄大なキリマンジャロ山の近くにあります。