The word "rock" is sometimes used to describe an expensive gemstone, but not many real rocks are used in high-quality jewelry. "Rocks" (e.g., diamonds) are single minerals; gem rocks are made up of two or more minerals and are usually fashioned into ornaments such as candlesticks or carved animals. Only a few gem rocks—lapis is a good example—are considered standard jewelry items.These days, more designer jewelry pieces are being set with unusual gems, with many designers favoring ornamental minerals and rocks. Los Angeles studio jeweler Beth Rosengard uses drusys of white chalcedony, agate, and chrysocolla in her wearable art. When Rosengard uses calcite-on-basalt—which to most jewelers might look only mildly interesting—the stuff becomes fine jewelry. Some of the other unusual gems starring in Rosengard's designs are psilomelane drusy, yowah nut opal, ammolite, and apache chrys

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