Black Prince's Ruby
The
Black Prince's Ruby
is currently set in the cross pattée in front of the
Imperial State Crown
, part of the
Crown Jewels
of England. Like many large red gems commonly called "rubies", it is in fact not a true
ruby
, but a
spinel
; the two
gemstones
can be distinguished on the basis of their hardnesses and densities, and the fact that a true ruby is
dichroic
while a spinel is singly
refractive
. The stone was given to
Edward the Black Prince
by
Pedro the Cruel
, king of
Castile
, on the victory of
Njera
in 1367. It was worn by
Henry V of England
at the battle of
Agincourt
, and was almost lost there.
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