The Blue Moon diamond has a cushion modified brilliant cut, weighs 12.03 ct, and measures 15.57 × 13.47 × 7.55 mm. Its small culet facet enabled us to perform spectroscopy through the parallel faces ...

While the public is generally unaware of Mozambique as a ruby source, the deposit near Montepuez is considered by the trade to be the world’s largest supplier. Gemfields’ first Mozambique ruby auction ...

Of all the sapphire deposits found in Montana, the richest is in the Rock Creek (Gem Mountain) district. Between 1890 and the 1930s, over 65 tonnes of rough sapphire were recovered from this area and ...

Industry analysts project that by 2025, 20% of all diamonds on the market will be laboratory-grown. Indeed, the gem industry has seen a significant increase in the quantity, size, and quality of ...

Amethysts from Boudi, Morocco, are characterized by double terminations and hourglass-shaped color zoning. This study provides infor­mation about the geology of the deposit, the mining of the material ...

Natural pearl identification is one of the critical problems in pearl research. The DNA study of pearly mollusks and oysters facilitates solving this problem. To fulfill this goal, GIA sent a group ...

This reading list gives you an opportunity to learn more about the history of Imperial topaz from the state of Minas Gerais in Brazil. Entries in the list are presented in chronological order to ...

Australia’s Sapphire Legacy Australia’s sapphire industry has spurred expertise, innovation, and equipment for colored stone mining throughout the world. Along with having been a major supplier of ...

Manufacture of a solid single-crystal diamond ring is a very complex and challenging process. Once material is removed from the crystal, very fine fractures and imbalanced strain can have severe ...

Cuprian (copper-bearing) tourmaline, known as “Paraíba” tourmaline in the trade, has been an important gem since its discovery in 1989. Until now, almost all of the material reported has been ...

Andrew Lucas, Nirupa Bhatt, Manoj Singhania, Kashish Sachdeva, Tao Hsu, and Pedro Padua ...

The Hope diamond, the Dresden Green, the Idol’s Eye, the Portuguese Diamond and the Moussaieff Red – these famous diamonds are spectacularly beautiful jewels that have been admired for centuries. An ...