V. Pardieu, “Blue Sapphires and Beryllium: ‘An Unfinished World Quest,’” InColor, No. 23, 2013, pp. 36–43. Photo courtesy of Vincent Pardieu. In the early 2000s, the sapphire market was flooded with a ...

In 1950 the manufacture of this type of lamp ceased. The minerals beryl and emerald are beryllium silicates and were known to the ancient world; the emperor Nero used a large emerald the better to ...