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Henry VIII's inventory of 1521 mentions "a great balas ruby" set in the Tudor Crown, [10] thought to be the Black Prince's Ruby. [11] It remained there until the monarchy was temporarily abolished in the 17th century. Oliver Cromwell had the royal crowns disassembled and gems sold, and the gold was melted down and struck into coins.
Dumortierite is a fibrous variably colored aluminium boro-silicate mineral, Al 7 BO 3 (SiO 4) 3 O 3.Dumortierite crystallizes in the orthorhombic system typically forming fibrous aggregates of slender prismatic crystals.
A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as a conulariid.Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) [1] in minute crystalline form, which has been deposited in concentric layers.
Facsimile of Poe's original manuscript for "The Murders in the Rue Morgue", the first appearance of C. Auguste Dupin. Dupin is from what was once a wealthy family, but "by a variety of untoward events" has been reduced to more humble circumstances, and contents himself only with the basic necessities of life. [2]
Ammolite is also known as aapoak (Kainah for "small, crawling stone"), gem ammonite, calcentine, and korite. The latter is a trade name given to the gemstone by the Alberta-based mining company Korite. Marcel Charbonneau and his business partner Mike Berisoff were the first to create commercial doublets of the gem in 1967. They went on to form ...
The association now trades under the name of Gem-A, following the closure of the organisation's gem testing lab in 2007 (and the organisation's subsequent refocus on research and education). [ 5 ] The Gemmological Association of Great Britain is a registered United Kingdom -based charity and its gemmology and diamond courses are taught in some ...
As a general rule, a cut gemstone will reduce the mass (in carats) by about 50%. [1] Among the several techniques used to work with gemstones are sawing, grinding, sanding, lapping, polishing, grilling, and tumbling. The diamond cut planning stage is a complex process that requires the cutter to work with unique rough stones.
Anulus piscatoris of Pope Leo XIII.. The Ring of the Fisherman (Latin: Anulus piscatoris; Italian: Anello Piscatorio), also known as the Piscatory Ring, is an official part of the regalia worn by the pope, who according to Catholic theology is the head of the Catholic Church and successor of Saint Peter, who was a fisherman by trade.