|four-square stone framesite bort|
|Written by Administrator|
|Wednesday, 19 September 2007|
four-square stone. See blocker, fracture. A term used to describe the chipping or breaking of a stone along a direction other than a cleavage plane. Types of fracture include con-choidal (kahn-koy"-dal), or shelllike; splintery; granular; even; and uneven. diamond has a distinct fracture, as well as cleavage, although it is less commonly seen because the cleavage develops so easily. It usually occurs in conjunction with cleavages, forming an irregular steplike pattern.
framesite bort. A coarse, gritty, rather friable, black, nongem quality of diamond found primarily in the Premier Mine, Republic of South Africa. See bort
Frankfurt Solitaire Diamond. In
1764, Francis I, Grand Duke of Tuscany, purchased a fine-quality brilliant-cut diamond, weighing approximately 45 carats, and had it mounted in his hat buckle. The lovely brilliant came to be known as the Frankfurt Solitaire. After the death of Francis, the Empress Maria Theresa had all of her late consort's private jewelry placed in the Royal Treasury for safekeeping; later, however, the stone was brought out and set in a diamond tiara. In 1918, the Austrian Royal Family took many of the Crown Jewels to Switzerland when they went into exile; among them was the Frankfurt Solitaire. About 1920, it was thought to have been stolen by a person close to the Family and taken to South America with other gems from this historic collection. Today, the location of this stone is unknown.
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