royal blue

noun
a deep blue, often with a faint reddish tinge.

Origin:
1810–20

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
royal blue
 
n
a.  a deep blue colour
 b.  (as adjective): a royal-blue carpet

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It's kind of a dark royal blue and isn't too bad for the undergrads.
When a technician switches off the lights, radiation from the cylinders puts on
  a light show of royal blue.
The water is a fresh royal blue tipped by whitecaps, with a steady swell that
  rolls the ship and makes walking a challenge.
Hence the abundance of deep royal blue: lovely as a knee-length silk dress with
  a loopy swirl of fabric on one shoulder.
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