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2. Pleochroism - Wikipedia

   en.wikipedia.org/wiki/Pleochroism

   Pleochroism is an extremely useful tool in mineralogy and gemology for mineral and gem identification, since the number of colors visible from different angles can identify the possible crystalline structure of a gemstone or mineral and therefore help to classify it. Minerals that are otherwise very similar often have very different pleochroic ...

3. Amethyst - Wikipedia

   en.wikipedia.org/wiki/Amethyst

   As amethyst is readily available in large structures, the value of the gem is not primarily defined by carat weight. This is different from most gemstones, since the carat weight typically exponentially increases the value of the stone. The biggest factor in the value of amethyst is the color displayed. [41]

4. Gemstone Meanings: Power and Significance of the 25 Most ...

   www.aol.com/gemstone-meanings-power-significance...

   Amethyst “Amethyst is a gemstone long associated with royalty and spiritualism and is said to bring tranquility and healing,” Salzer says. “In the same color spectrum wavelength as the third ...

5. Ametrine - Wikipedia

   en.wikipedia.org/wiki/Ametrine

   It is a mixture of amethyst and citrine with zones of purple and yellow or orange. Almost all commercially available ametrine is mined in Bolivia. The colour of the zones visible within ametrine are due to differing oxidation states of iron within the crystal. The citrine segments have oxidized iron while the amethyst segments are unoxidized.

6. February's Birthstone Has a Royal History Everyone Should ...

   www.aol.com/februarys-birthstone-royal-history...

   Amethyst's alleged benefits carried the semiprecious stone into the Middle Ages, a time often associated with magic, and the gem became associated with attributes such as courage and bravery.

7. Prasiolite - Wikipedia

   en.wikipedia.org/wiki/Prasiolite

   Prasiolite (also known as green quartz, green amethyst or vermarine) is a green variety of quartz. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, [ citation needed ] but it has also been mined in the Lower Silesia region of Poland .

8. Lustre (mineralogy) - Wikipedia

   en.wikipedia.org/wiki/Lustre_(mineralogy)

   Colour change is most commonly found in alexandrite, a variety of chrysoberyl gemstones. Other gems also occur in colour-change varieties, including (but not limited to) sapphire, garnet, spinel. Alexandrite displays a colour change dependent upon light, along with strong pleochroism. The gem results from small-scale replacement of aluminium by ...

9. Quartz - Wikipedia

   en.wikipedia.org/wiki/Quartz

   Prasiolite, an olive colored material, is produced by heat treatment; [68] natural prasiolite has also been observed in Lower Silesia in Poland. [69] Although citrine occurs naturally, the majority is the result of heat-treating amethyst or smoky quartz. [68] Carnelian has been heat-treated to deepen its color since prehistoric times. [70]