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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. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Spanish emerald and gold pendant at Victoria and Albert Museum Enamelled gold, amethyst, and pearl pendant, about 1880, Pasquale Novissimo (1844–1914), V&A Museum number M.36-1928. Gemstones have no universally accepted grading system. Diamonds are graded using a system developed by the Gemological Institute of America (GIA) in the early ...

4. 4 Best Holiday Gifts Under $50 For Retirees From Walmart

   www.aol.com/4-best-holiday-gifts-under-190024756...

   It fits sizes XS to 5XL and comes in colors of green midnight, black soot, blue cameo, pebble and smooth teal. ... Pendant Necklace and Wrist Watch. ... Choose from 18-karat, gold-plated rose gold ...

5. Metal-coated crystal - Wikipedia

   en.wikipedia.org/wiki/Metal-coated_crystal

   Aqua aura, crystals coated with gold fumes A flame aura pendant set in silver. Metal-coated crystals are artificial products made by coating crystals, such as quartz, with metal to give them an iridescent metallic sheen. Crystals treated this way are used as gemstones and for other decorative purposes. Possible coatings include gold, indium ...

6. Colored gold - Wikipedia

   en.wikipedia.org/wiki/Colored_gold

   White gold's properties vary depending on the metals used and their proportions. A common white gold formulation consists of 90% wt. gold and 10% wt. nickel. [3] Copper can be added to increase malleability. [2] The alloys used in the jewelry industry are gold-palladium-silver and gold-nickel-copper-zinc.

7. Dumortierite - Wikipedia

   en.wikipedia.org/wiki/Dumortierite

   Crystals show pleochroism from red to blue to violet. Dumortierite quartz is blue colored quartz containing abundant dumortierite inclusions. Dumortierite was first described in 1881 for an occurrence in Chaponost , in the Rhône - Alps of France and named for the French paleontologist Eugène Dumortier (1803–1873). [ 5 ]