by Gelogia Team | Jun 22, 2026 | Mineralogy
Spinel is one of the world’s most underrated gemstones. For centuries, many famous red spinels were mistaken for rubies because of their similar appearance. Today, spinel is recognized as a valuable gemstone in its own right, admired for its brilliant colors,...
by Gelogia Team | Jun 22, 2026 | Mineralogy
Morganite is a beautiful pink-to-peach gemstone variety of the mineral beryl. Known for its delicate pastel colors and exceptional clarity, morganite has become increasingly popular in fine jewelry, particularly engagement rings and luxury gemstone collections....
by Gelogia Team | Jun 22, 2026 | Mineralogy
Alexandrite is one of the rarest and most valuable gemstones in the world. It is famous for its remarkable ability to change color depending on the lighting conditions. In daylight, alexandrite typically appears green to bluish-green, while under incandescent light it...
by Gelogia Team | Jun 22, 2026 | Mineralogy
Tanzanite is one of the world’s rarest and most valuable gemstones. Known for its striking blue-violet color, tanzanite is found in only one location on Earth—a small mining area in northern Tanzania. Since its discovery in 1967, tanzanite has become one of the...
by Gelogia Team | Jun 21, 2026 | Mineralogy
The streak test is one of the simplest and most reliable methods used to identify minerals. While a mineral’s surface color can vary due to impurities or weathering, its streak often remains consistent. Geologists use streak tests to distinguish between minerals...
