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.
Tuesday, 17 December 2013
|Uncut diamond crystal from Arkansas.|
Liddicoatite with a zoned green and pink interior from Antsirabe, Madagascar.
|Elbaite candelabra (Tourmaline family)|
Beryl with Quartz - Blue beryl crystal on microcline.
|Pear-cut ametrine from Brazil|
Calcite with Pyrite - From Brush Creek mine, Reynolds County, Missouri. Calcite is a ubiquitous gangue mineral in Mississippi Valley type lead zinc deposits. This mine was closed in 2001 after 22 years of operation.
A round brilliant-cut citrine.
Clinohumite is a magnesium silicate commonly found as tiny indistinct grains. However, large euhedral crystals are sought after by collectors and can be cut into beautiful gemstones.
Sunday, 15 December 2013
|In November 2012, Christie's sold the cushion-shaped, colourless, 76.02-carat Archduke Joseph Diamond for $21.5 million.|
|The Graff Pink is a vivid pink, round-cornered rectangular step-cut diamond weighing 24.78 carats, set between shield-shaped diamond shoulders, in platinum.|
It sold on November 10, 2010 for $ 46.2m