fire opal

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An opal with brilliant flamelike yellow, orange, and red colors.

from The Century Dictionary.

• noun A variety of opal. See girasol.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any transparent to translucent opal with a warm body colour of yellow, orange, or red.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an opal with flaming orange and yellow and red colors