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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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