GIAについて 1931年設立の独立非営利組織であるGIA（Gemological Institute of America）は、宝石学における世界有数の権威として認められています。GIAはカラー、クラリティ、カット、カラット ウェイトからなる有名な4Cを考案し、さらに1953年にはダイヤモンドの品質の基準として世界中で認知されて ...

GIA has studied lab-grown or manmade diamonds extensively over the past 30 years, and we know a great deal about the methods used to produce them and how they can be recognized. While synthetic ...

宝石爱好者通常将其形容为“白天的祖母绿，晚上的红宝石”，亚历山大变石是金绿玉矿物中非常罕见的变色类别。 它最初在 19 世纪 30 年代被发现于俄罗斯的乌拉尔山脉，现在，斯里兰 卡、东非和巴西都发现了它的身影，尽管如此优良的材料依然非常稀少而珍贵。 亚历山大变石描述 亚历山大变石 ...

实际上，拓帕石拥有非常广泛的颜色范围，除褐色外，还包括各种色调和色度的蓝色、绿色、黄色、橙色、红色、粉红色和紫色。 无色拓帕石色彩度饱满，通常经处理后使其呈蓝色。 拓帕石也具有多向色性，这意味着，这种宝石能在不同的晶体方向呈现不同的色彩。 拓帕石描述 拓帕石的历史与 ...

Diamond Origin Report Full 4Cs assessment with a plotted clarity diagram, geographic origin and GIA report number laser inscription. For loose, natural D-to-Z color diamonds only, weighing 0.15 carats ...

GIA 知识交流研讨会是一系列演讲和研讨会，与参与者共同探讨当今宝石学面临的各种最为紧迫的问题，包括宝石原产地、实验室培育宝石和实地宝石学的新发现。这些网络研讨会由GIA 博士、实地宝石学家、教育工作者和研究科学家主讲，他们的专业知识与经验会为您提供丰富的宝石知识。 交流会对 ...

The 3309 cm –1 Series in Sapphire and Ruby: A Focus on FTIR Peak Position Variation Investigates the correlations between peak positions in the 3309 cm –1 series with trace element concentrations for ...

The GIA Knowledge Sessions are a series of talks and seminars that engage participants in the most diverse and pressing issues in gemology today, including gemstone origin, laboratory-grown stones and ...

Established in 1931, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading ...

Jewelry Design & Technology Program The Jewelry Design & Technology diploma program covers topics essential to becoming a jewelry designer and CAD (computer-aided design) technician, including ...

Figure 1. “Healing Sisters” rings with Four Peaks amethyst and San Carlos peridot, both from the San Carlos Apache Reservation in Arizona. These stones represent the geological diversity of colored ...

GIA in BangkokLocated in one of the most vibrant cities in Southeast Asia and one of the world’s largest trading centers for colored stones, GIA in Bangkok is vital to our laboratory and education ...