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Pendeloque Cut
A pendeloque cut or pear cut, is a pear-shaped modification of the round brilliant cut used for diamonds and other gemstones. The pendeloque cut is sometimes erroneously called briolette cut, another drop-shaped cutting design. While the briolette is a symmetrical drop shape, the pendeloque cut is flatter and has two different sides: one with a large table facet and one with a point or ridge. The top of a briolette is attached to the piece of jewelry, usually by a hole drilled in the stone, and a pendeloque cut stone needs to be mounted in a prong setting. The pendeloque is one of the drop cuts for gemstones. The Smithsonian Institution has a diamond pendeloque and briolette necklace presented by Napoleon Bonaparte in 1811 to his Empress consort Marie Louise. See also * Briolette * Cut (gems) A gemstone desired to be used in jewelry is cut, carved or made into a bead. The best quality rough is cut, also often referred to as faceting. This is done by a lapidary who decides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drop (liquid)
A drop or droplet is a small column of liquid, bounded completely or almost completely by free surfaces. A drop may form when liquid accumulates at the end of a tube or other surface boundary, producing a hanging drop called a pendant drop. Drops may also be formed by the condensation of a vapor or by Spray nozzle, atomization of a larger mass of solid. Water vapor will condense into droplets depending on the temperature. The temperature at which droplets form is called the dew point. Surface tension Liquid forms drops because it exhibits surface tension. A simple way to form a drop is to allow liquid to flow slowly from the lower end of a vertical tube of small diameter. The surface tension of the liquid causes the liquid to hang from the tube, forming a pendant. When the drop exceeds a certain size it is no longer stable and detaches itself. The falling liquid is also a drop held together by surface tension. Viscosity and pitch drop experiments Some substances that app ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cut (gems)
A gemstone desired to be used in jewelry is cut, carved or made into a bead. The best quality rough is cut, also often referred to as faceting. This is done by a lapidary who decides how to reshape the gemstone using his knowledge of the refractive index of gemstones to maximise any particular crystal's colour or play of light. As a general rule, a cut gemstone will be reduced in mass (in carats) by about 50%. 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. Very often, the location of the inclusions in a rough stone will determine the type of shape to which a diamond may be cut. For economic reasons, most diamonds are cut to retain weight instead of maximizing brilliance. How diamonds have been cut has evolved over time largely to technological advances. Types * Asscher cut * Bagu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Briolette
A briolette is a style of gemstone cut (gems), cut. It is an elongated, mostly symmetrical along the main axel, pear shape covered with angular facets usually with a pointed end and no Girdle (gemstone), girdle. It is often drilled to hang as a bead. The name is also sometimes erroneously used for pendeloque cut gems. While the briolette is a symmetrical drop shape, the pendeloque cut is flatter and has two different sides: one with a large table facet and one with a point or ridge. The top of a briolette is attached to the piece of jewelry, usually by a hole drilled in the stone, and a pendeloque cut stone needs to be mounted in a prong setting. The briolette is one of the Drop (liquid)#Shape, drop cuts for gemstones. The briolette cut is said to have been designed by Belgian Lodewyk van Bercken in 1476. This cut requires a more advanced technique than the round cuts, like the Brilliant (diamond cut), brilliant cut, and results in a much larger loss of the original stone's wei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marie Louise, Duchess Of Parma
Marie Louise (Maria Ludovica Leopoldina Franziska Theresia Josepha Lucia; 12 December 1791 – 17 December 1847) was Duchess of Parma from 11 April 1814 until her death in 1847. She was Napoleon's second wife and as such Empress of the French and Queen of Italy from their marriage on 2 April 1810 until his abdication on 6 April 1814. As the eldest child of Francis II, Holy Roman Emperor and Emperor of Austria, and his second wife, Maria Theresa of Naples and Sicily, Marie Louise grew up during a period marked by ongoing and unceasing conflict between Austria and revolutionary France. A series of military defeats at the hands of Napoleon Bonaparte had inflicted a heavy human toll on Austria and led Francis to dissolve the Holy Roman Empire. The end of the War of the Fifth Coalition resulted in the marriage of Napoleon and Marie Louise in 1810, which ushered in a brief period of peace and friendship between Austria and the French Empire, much like prior alliances between the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Napoleon
Napoleon Bonaparte (born Napoleone di Buonaparte; 15 August 1769 – 5 May 1821), later known by his regnal name Napoleon I, was a French general and statesman who rose to prominence during the French Revolution and led Military career of Napoleon, a series of military campaigns across Europe during the French Revolutionary and Napoleonic Wars from 1796 to 1815. He led the French First Republic, French Republic as French Consulate, First Consul from 1799 to 1804, then ruled the First French Empire, French Empire as Emperor of the French from 1804 to 1814, and briefly again in 1815. He was King of Italy, King of Kingdom of Italy (Napoleonic), Italy from 1805 to 1814 and Protector of the Confederation of the Rhine, Protector of the Confederation of the Rhine from 1806 to 1813. Born on the island of Corsica to a family of Italian origin, Napoleon moved to mainland France in 1779 and was commissioned as an officer in the French Royal Army in 1785. He supported the French Rev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Napoleon Diamond Necklace
The Napoleon Diamond Necklace is a diamond necklace commissioned by Napoleon I of France c. 1811–1812 from the Parisian jeweler Marie-Étienne Nitot. It is now in the Smithsonian Institution, Smithsonian National Museum of Natural History in Washington, D.C. Description The Napoleon Diamond Necklace is somewhat atypical of other contemporary works produced by Marie-Étienne Nitot. Other pieces commissioned from him by Emperor Napoleon, such as the two parures celebrating the Emperor's marriage to Marie Louise, Duchess of Parma, Archduchess Marie Louise of Austria, the Marie Louise Diadem, the wedding jewels for Joséphine de Beauharnais, Empress Joséphine, etc., all demonstrate a predilection for highly decorative flourishes in the framework. These range from silver scrollwork and floral motifs to complex interwoven curves. In contrast, the Napoleon Diamond Necklace is relatively simple and elegant. It consists of a single silver thread, with gold settings containing 28 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
