Beautiful, antique, Rosary in silver filigree and jet beads, from the 18th century.
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Beautiful, antique, Rosary in silver filigree and jet beads, from the 18th century.
Spain mid 1700's
Size: 97 cm
Jet is a type of lignite, the lowest rank of coal, and is a gemstone. Unlike many gemstones, jet is not a mineral, but is rather a mineraloid. It is derived from wood that has changed under extreme pressure.
The jet found in Asturias, the biggest deposit in northern Spain, is of Late Jurassic (Kimmeridgian) age, about 155 million years old. Asturian jet is a perhydrous coal that suffered an anomalous coalification process and presents great material stability over long periods of time.
Jet is also found near Santiago de Compostela in northwest Spain.