Dec 27, 2025 · In summary, the rarest type of corundum is undoubtedly the Padparadscha sapphire. Its unique blend of pink and orange hues, combined with limited geographic sources and complex …

Corundum has two primary gem varieties: ruby and sapphire. Rubies are red due to the presence of chromium, and sapphires exhibit a range of colors depending on what transition metal is present. [7]

Jan 26, 2018 · Gem corundum is rarely colored only by a single chromophore; the vast majority are colored by a combination of two or three chromophores. This composite photo illustrates the colors …

Corundum varieties offer a spectrum of captivating gem hues, from classic blue sapphires to vibrant green and regal purple variations.

The best are transparent with crisp faces and minimal inclusions, a rarity in corundum. Fancy-color sapphires (greenish, yellow, mixed hues) also occur. Fine Winza singles with pristine tips and strong …

Pure corundum, sometimes called leucosapphire, is transparent and colorless. This lack of color results directly from its chemical composition and highly organized, trigonal crystal structure.

The famous pinkish-red to red ruby owes its color to chromium (Cr 3+) impurities, and the color of the rare orangish-pink padparadscha sapphire is from both iron and chromium impurities.

Pure corundum is rare and is completely colorless. Color variations arise when small amounts of metallic impurities such as chromium, iron, and titanium substitute for aluminum in the structure.

Padparadschah is a very rare and sought after variety. - Pink to red variety of Corundum. See the gemstone section on Ruby for complete details. - Sapphire refers to all gem varieties of Corundum, …

Oct 3, 2022 · How rare is corundum? The mineral is common, but gem-quality corundum is rare. Ruby is the rarest type, while blue sapphires are the most common. The corundum sapphire is the state …