Rose quartz typically ranges in color from very light to medium dark pink. Often, it has numerous internal fractures that give it a cloudy translucence. The sources are Brazil, India, Madagascar and Sri Lanka.
Smoky quartz's color varies from light to dark brown, and some stones are so dark they’re almost black. Its color makes it a good choice as a gemstone accent for warm yellow and orange wardrobe colors. Sources are Brazil, Switzerland and the US.
Amethyst color range goes from palest lilac to rich purple. The stone can be heated to lighten its color or produce citrine or green quartz. Brazil is the major source, and amethyst is the birthstone for February.
Citrine is the top-selling transparent gem in the yellow to orange color range. Most citrines are produced by heat treating amethyst. Bolivia, Spain and Brazil are the major sources, and citrine is the birthstone for November.
Ametrine contains a striking mixture of purple amethyst and yellow citrine. Ametrine deposits are found in Brazil and Bolivia.
Rutilated quartz is a transparent quartz characterized by the presence of needles or strands of rutile within the structure of the quartz crystal. Rutile is a titanium dioxide mineral, and may contain large quantities of iron oxide. If the iron oxide content is high, the stone may have gold and red needles, and if the content is lower, these needles are darker, even almost black. Rutilated quartz is found all over the world.