Citrine 4x6mm Faceted Rondelle 15-16 Inch Rose and this phenomenon is thought

and this phenomenon is thought to be due to impurities of yttrium or organic matter within the crystal lattice

Smoky Quartz

but is most commonly associated with white

Famous malachite mines in the Ural mountains of Russia once produced 20 to ton blocks of the stone

Its chatoyant layers that create a flash which seems to emanate from within the stone as they catch the light

Citrine 4x6mm Faceted Rondelle 15-16 Inch Rose and this phenomenon is thoughtCitrine is a transparent Quartz, ranging in color from pale yellow to golden yellow, honey or brown, giving it a similar appearance to Topaz. It may also contain rainbow colored or sparkling inclusions. The name comes from the French word for lemon, citron. It was a prized gem in Greece as far back as 300 BCE.