COLOMBO, Dec 12 (Reuters) - Sri Lankan authorities on Sunday put on show what they said was the world's largest natural corundum blue sapphire, weighing 310 kilograms, which was found in a gem pit ...

“At the Corundum Hill Mine (near Highlands), various shades of ruby gem corundum have been found,” the U.S. Geological Survey reported in 1906. However, though the gems were similar to the red rubies ...

ECONOMYNEXT – The largest natural corundum ever recorded in Sri Lanka, which could also be the largest in the world, has attracted interest from potential buyers from China and the US, the 310 ...

Sri Lankan authorities put on show what they said was the world's largest natural corundum blue sapphire. Weighing more than 680 pounds, it was found in a gem pit ...

This gem belongs to the corundum family. Corundum is inherently colorless, according to the International Gem Society. So, each stone's elemental structure – such as the presence (or lack) of iron, ...

In this video Derek and I drive all the way up to North Carolina to go hunting for Ruby and Sapphire Corundum crystals at the world famous Propst Farm near Lincolnton, NC. This was my first time ...

THE three works cited below give much new and valuable information concerning the mode of occurrence, the processes of mining, and the uses of corundum. As the mineral is of growing economic value, ...

Sri Lankan authorities on Sunday put on show what they said was the world’s largest natural corundum blue sapphire, weighing 310 kilograms (683 pounds), which was found in a gem pit about three months ...