Ruby can command the highest prices of any colored gemstone. The per-carat prices of fine-quality rubies have been rising consistently, many times breaking auction records. Click here …

Color. Color is the most significant factor affecting a ruby’s value: Fine gems are a pure, vibrant red to slightly purplish red.

The finest ruby has a pure, vibrant red to slightly purplish red color. As the color becomes too orangy or more purplish, the ruby moves down in quality. The highest-quality rubies have vivid …

The finest color of the birthstone for July is a deep red with a hint of purple, called “pigeon’s blood” in the trade. A variety of the mineral corundum, ruby gets its color from trace amounts of the …

Ruby is highly regarded and can command high per-carat prices. It is arguably one of the most important gems in the colored stone market. In its purest form, the mineral corundum is …

Jul 1, 2013 · Like its sister gemstone sapphire, ruby is a variety of the mineral corundum. Corundum in its purest form is colorless. The trace element of chromium gives corundum a red …

GIA’s Gem Encyclopedia is a virtual journey through the science and lore of gemstones from across the globe. Each precious stone page features additional detailed gemological …

Increasing demand for ruby alternatives rekindled appreciation for spinel’s rich red color and history. In ancient times, southeast Asia’s mines yielded exceptional large spinel crystals, …

Often described by gem aficionados as “emerald by day, ruby by night,” alexandrite is the very rare color-change variety of the mineral chrysoberyl. Originally discovered in Russia’s Ural …

Ruby is famous for the beauty of its red color. Red represents strong emotions like love and anger. The most famous rubies are found in marble, a metamorphic rock. These have rich red …