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Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.
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.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.
The Aztecs' own masks are more typically of turquoise inlay, the Mayans' of jade inlay (see gallery). Another supposed type of Pre-Columbian hardstone carving is the rock crystal skull; however experts are now satisfied that all known large (life-size) examples are 19th-century forgeries, though some miniature ones may be genuinely Pre-Columbian.
The Byzantines perfected a unique form of cloisonné icons. Byzantine enamel spread to surrounding cultures and a particular type, often known as "garnet cloisonné" is widely found in the Migration Period art of the "barbarian" peoples of Europe, who used gemstones, especially red garnets, as well as glass and enamel, with small thick-walled cloisons.
An engraved gem, frequently referred to as an intaglio, is a small and usually semi-precious gemstone that has been carved, in the Western tradition normally with images or inscriptions only on one face. [1] The engraving of gemstones was a major luxury art form in the ancient world, and an important one in some later periods. [2]
Altar frontal of Italian opera di commessi, Dubrovnik Cathedral Detail of design with roses over crossed canes, 1882. Pietra dura (Italian: [ˈpjɛːtra ˈduːra]), pietre dure ([ˈpjɛːtre ˈduːre]) or intarsia lapidary [1] (), called parchin kari or parchinkari (Persian: پرچین کاری) in the Indian Subcontinent, is a term for the inlay technique of using cut and fitted, highly ...
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