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Há 1 dia · 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 source of knowledge, standards, and education in gems and jewelry.
Há 3 dias · We offer the finest gem and jewelry education in the world with curriculum developed from our groundbreaking research and delivered by the industry’s leading experts. GIA gives you the knowledge and practical skills to translate your love for gems and jewelry into a rewarding career.
Há 3 dias · Aquamarine Description. An aquamarine crystal in its natural state shows why these specimens are prized for their beauty. - Courtesy Daniel Trinchillo, Fine Minerals International. Aquamarine is the green-blue to blue variety of the mineral beryl.
Há 3 dias · GIA's D-to-Z color-grading scale is the industry's most widely accepted grading system. The scale begins with the letter D, representing colorless, and continues, with increasing presence of color, to the letter Z.
Há 3 dias · Amethyst Description. This amethyst crystal is from Namibia. It shows classic quartz crystal shape: a six-sided columnar crystal with a pyramid-shaped termination at the top. Courtesy Daniel Trinchillo, Fine Minerals International. Amethyst is the purple variety of the quartz mineral species.
Há 5 dias · Alexandrite Description. This 7.19-carat alexandrite was cut to feature its beautiful color change. When the light source changes from daylight to incandescent light, the gem’s color changes from bluish green to reddish purple.
Há 2 dias · Understanding the Color Scale: Diamond color grading is based on a scale that ranges from D (colorless) to Z (light yellow or brown). Diamonds that fall within the D to F range are considered colorless or near colorless and are highly prized for their purity and brilliance. As you move down the color scale towards Z, the presence of yellow or ...
