Malachite

Gemstone radiation is a common but little understood technique for altering colors. Learn how it works and what gems usually receive this treatment.…

Although gemstone magnetism isn’t commonly tested, it can help gemologists distinguish similar looking gems. Learn how to analyze this property.…

Blue is one of the rarest colors in nature. Nevertheless, blue gemstones are always in demand for jewelry. While people have adorned themselves…

Streak testing is a destructive gemstone test rarely used by gemologists, but it is a standard diagnostic test for mineralogists. Most gems leave…

Dioptase has a beautiful, emerald-like green color. Although this mineral isn’t rare, gems are seldom faceted because of a paucity of clean…

This table contains a selection of minerals gemologists may encounter as jewelry stones or gem specimens. The gems are sorted by their crystal…

Measuring specific gravity helps gemologists identify gemstones. The following table lists the specific gravity values for a variety of gem…

Collectors prize deep blue azurite crystals, but faceted gems are extremely rare. However, azurite frequently occurs mixed with green malachite,…

Not happy with your birthstone? Explore these alternative birthstones associated with astrological signs, angels, the hour or day of your birth,…