The dark, coal-like gemstone that once adorned the wardrobes of queens
In short: It is not a mineral, but a fossilized memory of ancient forests. From Roman amulets to the mourning dress of Queen Victoria, jet has transitioned from a magical protector against the evil eye to a centerpiece of high fashion and religious devotion.
Jet is a mineraloid, a type of lignite formed from the decomposition of ancient wood—specifically from the Araucariaceae family—under extreme pressure millions of years ago. While the exact composition varies by source, it is roughly 75% carbon and 12% oxygen. The famous Whitby jet, found in England’s North York Moors, dates back approximately 181 million years to the Early Jurassic epoch.
Throughout history, the material's use has shifted with the cultural tides. In Roman Britain, jet was a popular medium for rings and pendants, often featuring Medusa heads to ward off evil. During the Middle Ages, it became a staple of religious life, used for rosary beads and crosses, particularly in trade hubs like Santiago de Compostela. By the 16th century, it reached the height of royal fashion; Elizabeth I famously purchased 1,000 'black jet bugle drops' for her headdresses in 1587, and Anne of Denmark once commissioned a gown so heavily laden with jet buttons and ornamentation that it was too heavy to wear.
The industry saw a massive resurgence in the 1850s as mourning jewellery, driven by Queen Victoria’s personal grief. However, this golden age was temporary. Following a peak in the early 1870s, the trade declined as Art Nouveau fashions moved away from black jewellery. In Whitby, the workforce plummeted from over 1,000 workers to just 300 by 1884. While glass and ebonite served as substitutes, the authentic craft eventually vanished, with the last practitioners of the Whitby tradition passing away after World War II.
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Sources
- Summary by Intellect · source: Jet (gemstone)
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