Idocrase is one of the lesser known and more beautiful collector gems. When properly cut it is as bright and attractive as the grossular garnets, which it so strongly resembles. The complexities of its chemistry lead to a huge range in properties and colors. Cuttable material is known from Italy (brown and green), Quebec (pale green, bright yellow), New York (brown), Pakistan (green), Kenya (brown and green).

An apple-green, fine-grained, massive idocrase is found southeast of Skihist Mountain. Some of the material is translucent and may be gem quality.