The Gemological Institute of America (GIA) calls musgravite "a rarity among the rare a particular gem on our research examination 'want list.'"
A very close relative of another hard-to-find gemstone, taaffeite (and often misidentified as such), musgravite was first discovered in 1967 in the Musgrave Range of South Australia.Facet grade -- the baseline measurement of how clean cut a sellable stone must be -- for musgravite was not reported until 1993. As of 2005, there were only eight musgravite specimens in the world.
4.Black OpalOpal is Australia’s national gemstone, and black opal is the rarest and most valuable of its kind, at times selling at prices that rival the best diamonds. The stone must have a rich, black background, but base colors come in all shades of gray, which is why opinions vary on what is a "true" black opal.Found in the Lightning Ridge area in northwestern New South Wales, black opals are natural, solid stones that absorb scattered white light, giving it brilliant spectral colors.
You probably haven’t heard about this stone before, but Serendibite is currently the number three most expensive and rarest stone on the Planet. It has an extremely complex chemical composition. In it you can find Calcium, Magnesium, Aluminium, Silicon and Oxygen. Until present there have only been three stones cut.
Red diamonds, just like any other diamonds, are made of compressed carbon. However, the brilliant red color in these diamonds is formed from a structural defect in the crystal lattice structure, which is why they are the rarest of the colored diamond collection.Only a handful have ever received the grade of "Fancy Red," meaning that they are pure red with no modifying color. Most are sold at market for millions of dollars.The Argyle mine in Australia is the primary producer of pink and sometimes red diamonds