Price guide to antique and vintage jadeite bird brooches. Jadeite is a pyroxene mineral and one of the two types of pure jade. The other is known as nephrite jade. Jadeite is the rarer of the two jades, and as a result, it is considered to be more precious and valuable. The most valuable form of jadeite is a striking and even emerald green known as “imperial jadeite”. Reference: Gem Select
