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A doublet is a type of assembled gem composed in two sections. [1] It is sometimes used to imitate other, more expensive gems. Opal Doublet. A garnet and glass doublet uses a top portion of natural garnet fused to any color of glass to imitate a gem. The color of glass used in the doublet is all that is seen, as the garnet provides no color.
An opal doublet consists of a relatively thin layer of precious opal, backed by a layer of dark-colored material, most commonly ironstone, dark or black common opal (potch), onyx, or obsidian. The darker backing emphasizes the play of color and results in a more attractive display than a lighter potch.
Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O.
A doublet (/ˈdʌblɪt/; [1] derived from the Ital. giubbetta [2]) is a man's snug-fitting jacket that is shaped and fitted to a man's body. The garment was worn in Spain , and spread to the rest of Western Europe , from the late Middle Ages up to the 17th century.
Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America.It is commonly unearthed by natural erosion or through the process of various mining practices, within the perimeter of an ancient sea bed called the Western Interior Seaway. [2]
The colour of the glass was intended by the artist to imitate turquoise. [16] "Gonzaga Cameo": Ptolemy II and Arsinoë II. Sardonyx. 3rd century BC. [17] Agrippina the Elder Cameo. Carved in Italy in the period of 37–41 AD. The carving is a three layer agate. Ptolemaic double cameo — Hellenistic, 278–270/269 BC. Eleven-layered onyx. [16]
Consequently, narrow band-pass filters that isolate the 500.7 nm and 495.9 nm wavelengths of light, that correspond to green-turquoise-cyan spectral colors, are useful in observing these objects, causing them to appear at higher contrast against the filtered and consequently blacker background of space (and possibly light-polluted terrestrial ...
The Balmoral doublet is a single-breasted jacket traditionally made from velvet. It is usually worn with a belt and black bow tie. The Montrose doublet (as defined by Kinloch Anderson) is "a double breasted short cut evening jacket with high collar. There are ten symmetrically positioned Celtic buttons on front, three Celtic buttons on each ...
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