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  2. Diamond (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Diamond_(gemstone)

    In October 2020, a population of diamonds were discovered within an alluvial deposit at the Ellendale diamond field in Australia that exhibit an ultra rare purple fluorescence. Some diamonds with "very strong" fluorescence can have a "milky" or "oily" look to them, but they are also very rare and are termed "over-blues."

  3. Ruby pressure scale - Wikipedia

    en.wikipedia.org/wiki/Ruby_Pressure_Scale

    Ruby spectra R1, R2 lines. The ruby fluorescence pressure scale is an optical method to measure pressure within a sample chamber of a diamond anvil cell apparatus. [1] Since it is an optical method, which fully make use of the transparency of diamond anvils and only requires an access to a small scale laser generator, it has become the most prevalent pressure gauge method in high pressure ...

  4. Fluorescence - Wikipedia

    en.wikipedia.org/wiki/Fluorescence

    Fluorescence of aragonite Necklace of rough diamonds under UV light (top) and normal light (bottom) In addition to the eponymous fluorspar, [66] many gemstones and minerals may have a distinctive fluorescence or may fluoresce differently under short-wave ultraviolet, long-wave ultraviolet, visible light, or X-rays.

  5. Nitrogen-vacancy center - Wikipedia

    en.wikipedia.org/wiki/Nitrogen-vacancy_center

    Simplified atomic structure of the NV center. The nitrogen-vacancy center (N-V center or NV center) is one of numerous photoluminescent point defects in diamond.Its most explored and useful properties include its spin-dependent photoluminescence (which enables measurement of the electronic spin state using optically detected magnetic resonance), and its relatively long (millisecond) spin ...

  6. Luminous gemstones - Wikipedia

    en.wikipedia.org/wiki/Luminous_gemstones

    Alexander set it in gold, and used it as a lamp at night" (Laufer 1915: 58). Sydney H. Ball recounts the widespread variation of the animal-gratitude snake story involving a wild animal (often called carbuncle, Spanish carbunclo, or Latin carbunculo) with a luminous gem on its head, and which Europeans apparently introduced into Africa and America.

  7. Ellendale Diamond Field - Wikipedia

    en.wikipedia.org/wiki/Ellendale_Diamond_Field

    In 2020 IBDH reported that the company had discovered a population of diamonds from within the L-Channel that exhibited purple fluorescence under long wave ultraviolet light. [7] While around 35% of all natural diamonds may fluoresce, purple fluorescence in diamonds has only been rarely reported. The causes for this natural phenomenon and the ...

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