This sapphire from Kashmir has an intense velvety blue color. – Photo: Robert Weldon/GIA. Sapphire is one of the Big three of jewelry colored gemstones—the other two are ruby and emerald. A durable ...

Get ready to turn your inspirations into designs with the Jewelry Design course. You’ll learn drafting, shading, design theory, how to illustrate shape and form using several mediums, and more. At the ...

Those born in January are lucky to have the beautiful and diverse garnet as their birthstone. Garnets are commonly red but also come in an extraordinary range of beautiful colors, including orange, ...

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 ...

The gemological properties of synthetic green and lavender jadeite, which has been manufactured by the General Electric Company on an experimental basis, are summarized. The synthetic jadeites ...

Colorless synthetic quartz that shows obvious Brazil-law twinning has been grown over a seed plate of natural amethyst that is twinned according to the Brazil law. Although commercially available ...

Consumers now, more than ever, have a heightened awareness of sustainably and ethically sourced products. The GIA Diamond Origin Report uses scientific evaluation to provide confirmation of a ...

Metrology, the science of measurement and its application, plays a critical role in the accuracy of GIA’s research and laboratory services. The metrology team closely monitors the performance of ...

With decades of expertise and laboratory locations worldwide, GIA uses more advanced instrumentation that extends far beyond the boundaries of standard gemological testing. The comprehensive analysis ...

すべてのGIA拠点でご利用可能。 マラウイ産のブルージルコンが報告される マラウイで新たにブルージルコンの産出が報告されました。研磨すれば美しい宝石となる原石を宝石取引市場に ...

黄水晶是一种精美通用的宝石，可用于制作珠宝首饰，并且只需适当的护理。 – Robert Weldon（罗伯特·韦尔登） 莫氏硬度用以衡量宝石和矿物的硬度。 这些数字以一种矿物可被其他矿物划伤的 ...

这颗大型澳大利亚淡色凸圆面蛋白石，重达 117.85 克拉。蛋白石上面布满了橙色和绿色的星火图案小型游彩闪光，灰色的体色缀以柔和的蓝色斑点。 每一颗蛋白石的外观和质量都大有不同。