Loose natural faceted gemstones in orange, pink, purple, blue and green, including pear, oval, heart and cushion cuts

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Newest Articles

  • Loose faceted sapphires in blue, pink, purple, orange, yellow, green, grey and colorless, showing the range of sapphire colors

    Sapphire: The Many Colors of Corundum

    A complete guide to natural sapphire: the chemistry behind its many colors, the world's major deposits, treatments and synthetics, and the famous stones and record crystals behind its reputation.

    Sapphire: The Many Colors of Corundum

    A complete guide to natural sapphire: the chemistry behind its many colors, the world's major deposits, treatments and synthetics, and the famous stones and record crystals behind its reputation.

  • The ten Mohs scale reference minerals on labelled display stands in hardness order: talc 1, gypsum 2, calcite 3, fluorite 4, apatite 5, orthoclase 6, quartz 7, topaz 8, ruby 9 and diamond 10

    Gemstone Hardness and the Mohs Scale Explained

    What hardness in a gemstone actually means, how the Mohs scale came about, why its steps are so uneven, and whether anything is genuinely harder than diamond.

    Gemstone Hardness and the Mohs Scale Explained

    What hardness in a gemstone actually means, how the Mohs scale came about, why its steps are so uneven, and whether anything is genuinely harder than diamond.

  • Painterly rendering of Friedrich Mohs in his study working on his hardness scale, with the ten labelled reference minerals set out in front of him

    Gemstone Hardness List

    Mohs hardness values for more than 140 gemstones and gem materials, from talc at 1 to diamond at 10, with the mineral species behind each trade name.

    Gemstone Hardness List

    Mohs hardness values for more than 140 gemstones and gem materials, from talc at 1 to diamond at 10, with the mineral species behind each trade name.

  • Illustrative comparison of Kashmir, Ceylon, Madagascar, and Burma sapphire color

    Kashmir Sapphires: The Legend of the Blue Treasure

    Why Kashmir sapphires outprice every other blue: the legendary Paddar mines, the science behind the velvety cornflower blue, and the records they set at auction.

    Kashmir Sapphires: The Legend of the Blue Treasure

    Why Kashmir sapphires outprice every other blue: the legendary Paddar mines, the science behind the velvety cornflower blue, and the records they set at auction.

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