Some stones exhibit the phenomenon known as color change, most often going from blue in daylight or fluorescent lighting to purple under incandescent light. Sapphires can even be gray, …

Sapphire is one of the big three of colored gemstones (the other two are ruby and emerald). This durable gemstone captures jewelry buyers with its practicality and aura of romance. Click here …

Sapphire is one of the Big 3 of jewelry gemstones—the other two are ruby and emerald. Sapphire is a durable stone that’s the best known blue gem, as well as being available in most colors.

Blue sapphire belongs to the mineral species corundum. It can be a pure blue but ranges from greenish blue to violetish blue. The name “sapphire” can also apply to any corundum that’s not …

In folklore, history, art, and consumer awareness, sapphire has always been associated with the color blue. Its name comes from the Greek word sappheiros, which probably referred to lapis …

Aug 29, 2025 · Investigates the correlations between peak positions in the 3309 cm –1 series with trace element concentrations for ruby, metamorphic and basalt-related blue sapphire, and …

Sapphire is corundum, the same type of mineral as ruby, except that it is not red. Sapphire is famous for its blue color, but it also comes in many other colors, such as orange and pink.

Sapphire, the September birthstone comes in all the colors of the rainbow – except red. Learn more about the birthstone of wisdom, loyalty, and nobility and discover its history and where it …

Jul 16, 2013 · Over time, the matching of sapphire’s desirable optical, mechanical, chemical, structural, and thermal properties to technological applications led to larger, more perfect, and …

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 …