Tuesday, 31 December 2013
Saturday, 28 December 2013
The closest synthetic approximation to diamond is a man-made diamond. Man-made diamonds can be made of pure carbon.
Friday, 27 December 2013
Wednesday, 25 December 2013
Mining methods are relatively primitive and when gravel is extracted from current riverbeds, it is done with hand-made scrapers.
| Marco Polo wrote that the island had the best sapphires, topazes, amethysts, and other gems in the world.|
Ptolemy, the 2nd century astronomer recorded that beryl and sapphire were the mainstay of Sri Lanka’s gem industry.
Tuesday, 24 December 2013
|The Black Star of Queensland is a 733-carat black sapphire, and the world's largest gem quality star sapphire. It was discovered in Australia in the 1930s.|