In 1983, the Argyle mine was established as the first major diamond-mining operation in Australia. Almost immediately, it became the world’s largest source of diamonds in terms of the volume (carats) ...

This 10.12 ct Fancy Vivid yellow pear shape illustrates the effect a fancy shape can have on intensifying the color in a yellow diamond. - Courtesy the Scarselli Family Color In diamonds, rarity ...

Soon after it was first marketed in 1976, colorless cubic zirconia became the dominant diamond imitation, with current production of approximately 60 million carats per year. Although cubic zirconia ...

This ancient necklace dates to 2000BCE. An inscription on the center stone is a South Arabian script from the 8th century BCE. - From "Gems and Gemstones: Timeless Natural Beauty of the Mineral World" ...

GIA is the world’s most trusted name in diamond grading and gem identification. With objectivity and expertise as its hallmarks, GIA ensures the integrity and accuracy of every report it issues. GIA ...

This 3.28-carat Paraíba tourmaline's vivid violetish blue hue rivals the finest sapphires. Because of this tourmaline's rarity, its per-carat price is also likely to rival the price of fine sapphire.

With a reach that spans the globe, GIA is a nonprofit institute dedicated to protecting consumers by ensuring their trust in gems and jewelry through cutting edge gemological research, rigorous ...

This gem at the Chicago Field Museum of Natural History is inscribed with noor jahan, or “light of the universe.” - Courtesy "Gems and Gemstones:Timeless Natural Beauty of the Mineral World" by Lance ...

The new reports are digital-only, featuring updated design and format to fully differentiate them from GIA’s reports for natural diamonds.

GIA iD100 ® は、色の範囲が無色からほぼ無色、サイズが直径0.9ミリメートル以上のダイヤモンドにおいて、石留めされたものおよび裸石、原石およびカット済みの天然ダイヤモンドをラボラトリーグロウン （HPHTとCVD）ダイヤモンドやダイヤモンド類似石から ...

Emerald, the birthstone for May, has been beloved for millennia, evoking rebirth and renewal. Widely regarded as the definition of green, emerald is the perfect color for spring. From the poetic ...

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