This highly collectible type of vintage jewelry is called dragon's breath and is usually of Czech origin. The red-orange transparent glass has an inner fire with bold flashes of purple and resembles high quality Mexican fire opal.
This brooch measures 1 1/16" across. The art glass cabochon is bezel set in a sterling setting with a fine filigree border around the perimeter. (You can see where the wire-work started and stopped on the upper left of the brooch, and that it was laid in by hand.) The pin has a safety closure and the back is marked "sterling". Very good condition.
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