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A polished almandine stone . Carbuncle (/ ˈ k ɑːr b ʌ ŋ k əl /) is another name for a deep red almandine gemstone that has been cut with a smooth, convex face in a method called cabochon. [1] Traditionally, the term referred to any red gemstone, most often a red garnet. [2] Carbuncles and their chimeras have spanned three millennia.
Asterism is generated by reflections of light from twin-lamellae or from extremely fine needle-shaped acicular inclusions within the stone's crystal structure. [1] A common cause is oriented sub-microscopic crystals of rutile within the gem mineral. It occurs in rubies, sapphires, garnet, diopside, and spinel when a cabochon is cut from a ...
Chemically, almandine is an iron-aluminium garnet with the formula Fe 3 Al 2 (SiO 4) 3; the deep red transparent stones are often called precious garnet and are used as gemstones (being the most common of the gem garnets). [17]
A channel setting is a method whereby stones are suspended between two bars or strips of metal, called channels. Typically, a line of small stones set between two bars is called a channel setting, and a design where the bars cross the stones is called a bar set. The channel is a variation of a "U" shape, with two sides and a bottom.
Large stones were frequently set in box-bezels on enamelled rings. [53] Notable among merchants of the period was Jean-Baptiste Tavernier, who brought the precursor stone of the Hope Diamond to France in the 1660s. When Napoleon Bonaparte was crowned as Emperor of the French in 1804, he revived the style and grandeur of jewellery and fashion in ...
An n-trapezohedron is defined by a regular zig-zag skew 2n-gon base, two symmetric apices with no degree of freedom right above and right below the base, and quadrilateral faces connecting each pair of adjacent basal edges to one apex. An n-trapezohedron has two apical vertices on its polar axis, and 2n basal vertices in two regular n-gonal