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  2. Gemstone irradiation - Wikipedia

    en.wikipedia.org/wiki/Gemstone_irradiation

    Gemstone irradiation is a process in which a gemstone is exposed to artificial radiation in order to enhance its optical properties.High levels of ionizing radiation can change the atomic structure of the gemstone's crystal lattice, which in turn alters the optical properties within it. [1]

  3. Pearl - Wikipedia

    en.wikipedia.org/wiki/Pearl

    The correct definition of a South Sea pearl – as described by CIBJO and GIA – is a pearl produced by the Pinctada maxima [21] pearl oyster. South Sea pearls are the color of their host Pinctada maxima oyster – and can be white, silver, pink, gold, cream, and any combination of these basic colors, including overtones of the various colors ...

  4. Earring - Wikipedia

    en.wikipedia.org/wiki/Earring

    Magnetic earrings – Magnetic earrings simulate the look of a (pierced) stud earring by attaching to the earlobe with a magnetic back that hold the earring in place on by magnetic force. Stick-on earrings – Stick-on earrings are adhesive-backed items which stick to the skin of the earlobe and simulate the look of a (pierced) stud earring.

  5. Castellani (goldsmiths) - Wikipedia

    en.wikipedia.org/wiki/Castellani_(goldsmiths)

    Fortunato Pio Castellani (1794–1865) is regarded as the forefather of the family. In 1814, Fortunato opened his own workshop in Rome. The progenitor specialized in the creation of jewels emulating the ones that then came to light from the necropolis of Etruria, that were found in the excavations of Pompeii and Herculaneum or that could be observed in the Campana collection.

  6. Crystal healing - Wikipedia

    en.wikipedia.org/wiki/Crystal_healing

    Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Despite the common use of the term "crystal", many popular stones used in crystal healing, such as obsidian, are not technically crystals .

  7. Medieval jewelry - Wikipedia

    en.wikipedia.org/wiki/Medieval_jewelry

    In Italy, there was a practice of coral worn around the neck of infants to imitate pictures of Christ wearing coral as a child. [6] Gems were chosen by wearers based on the healing powers they were thought to have had as well as the associated meanings behind their color and size.