Carnelian
From BiblePortal Wikipedia
Holman Bible Dictionary [1]
Ezekiel 28:13 Revelation 4:3 Revelation 21:20
Webster's Dictionary [2]
(n.) A variety of chalcedony, of a clear, deep red, flesh red, or reddish white color. It is moderately hard, capable of a good polish, and often used for seals.
Hastings' Dictionary of the Bible [3]
Carnelian . See Agate under Jewels.