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In 2015, the auction house Bonhams sold the 50.13-carat Hope Spinel for a world-record £962,500 ($1.22m) — over six times its estimate — helping to catapult the stone into public consciousness.
It has been in the possession of England's rulers since it was given in 1367 to its namesake, Edward of Woodstock (the "Black Prince"). [2] The stone is believed to have originated from the Badakhshan mines in present day Afghanistan [3] and Tajikistan, [4] the principal source of large spinel gems in the Middle Ages.
Its hardness is 8, its specific gravity is 3.5–4.1, and it is transparent to opaque with a vitreous to dull luster. It may be colorless, but is usually various shades of red, lavender, blue, green, brown, black, or yellow. [9] Chromium(III) causes the red color in spinel from Burma. [10]
[4] [5] As such, it is the only gemstone to have been initially identified from a faceted stone. Most pieces of the gem, prior to Taaffe, had been misidentified as spinel. For many years afterwards, it was known only in a few samples, and it is still one of the rarest gemstone minerals in the world. [6]
The Three Brothers (also known as the Three Brethren; German: Drei Brüder; French: Les Trois Frères) was a piece of jewellery created in the late 14th century, which consisted of three rectangular red spinels arranged around a central diamond. The jewel is known for having been owned by a number of important historical figures.
The mineral ceylonite has the chemical composition of (Mg, Fe 2+) Al 2 O 4, putting it into a group of minerals known as the spinel group, or the oxide spinels. The oxide spinels have a formula of the model [A][B] 2 O 4; where [A] is commonly Fe 2+, Mg 2+, or Mn 2+, and [B] is Fe 3+, Al 3+, or Cr 3+. It is an iron-rich variety of the spinel ...
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