Tiger's-Eye QuartzClose-up view of a large polished slab of quartz variety tiger’s-eye from the Marra Mamba Iron Formation of Western Australia. It measures more than 3 meters (10 feet) long, 50 cm ...

Cultured pearls come in different sizes, shapes, and colors. Perhaps the best-loved gems of all time, pearls—both natural and modern cultured pearls—occur in a wide variety of colors. The most ...

Yellow to Orange Sapphires Yellow sapphire is also available in a variety color saturations from yellow to orangy yellow and in light to dark tones, while orange sapphires have deep golden, to ...

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 premier online job board exclusively for the gem and jewelry industry. Free for job seekers and employers, you'll find powerful features to speed up your search for the perfect job or qualified ...

Opal can range from 5 to 6.5 on the Mohs hardness scale. Hardness and toughness Gem and mineral hardness is measured on the Mohs scale. The numbers are based on the relative ease or difficulty with ...

Figure 1. This gold ring with a phoenix motif features a Neyshabur turquoise (13 × 17 mm), with a 0.02 ct ruby on each side and diamond accents. Courtesy of Taktala Jewelry, Tehran. Turquoise is an ...

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 ...

Graduate Jeweler Program The Graduate Jeweler diploma program is a hands-on experience that introduces students to the knowledge and skills required for a career in jewelry fabrication and repair. You ...

If you were born in the month of June, you are lucky enough to have three birthstones to call your own. June is one of only three months (the others are August and December) that has three birthstones ...

GIA ダイヤモンド オリジン レポート: 科学に基づくトレーサビリティ 消費者は、これまで以上に持続可能かつ倫理的に調達された製品に対する意識を高めています。 GIA ダイヤモンド オリジン レポートは、科学的評価を使用して、ダイヤモンドの地理的起源を確認します。 詳細（英語のみ） ...

Diamonds have a long history as beautiful objects of desire. In the first century AD, the Roman naturalist Pliny stated: “Diamond is the most valuable, not only of precious stones, but of all things ...