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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.
The name Almandine is a corruption of Alabanda, a region in Asia Minor where these stones were cut in ancient times. 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]
After color follows clarity: similar to diamonds, a clear stone will command a premium, but a ruby without any needle-like rutile inclusions may indicate that the stone has been treated. Ruby is the traditional birthstone for July and is usually pinker than garnet , although some rhodolite garnets have a similar pinkish hue to most rubies.
Large stones were greatly valued, and many rulers and great nobles amassed collections, which were often frequently reset. [12] Ancient engraved gems were often reused among stones, which in early medieval jeweled objects were often set profusely, spaced out across surfaces, mixed with ornaments in gold. Medieval gem engraving only recaptured ...
Pages in category "Garnet gemstones" The following 13 pages are in this category, out of 13 total. ... This page was last edited on 7 June 2016, at 12:52 (UTC).
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 ...