|Citrine is the most popular gemstone in the yellow to orange color range, and one of the most affordable of the harder gems. A variety of crystalline quartz, citrine has excellent transparency and is often found in large sizes, with gems over 20 carats not uncommon.||Though there is a lot of citrine in the market, natural untreated citrine is rare, especially in the more saturated colors, since much of the low-cost citrine sold is treated or synthetic.|
|Most natural citrine is a pale yellow, the color derives from traces of iron. Many commercial grade citrine in the market have been produced by heat-treating weakly colored amethyst, which will turn yellow at relatively low temperatures.|
The most valuable citrines are the natural gems in the saturated colors, known in the trade as Madeira Citrine.
The name derives from a fortified Portuguese wine made in the Madeira Islands.
|High quality citrine tends to be very clean, with no eye visible inclusions. |
Transparency is excellent, and the material takes a very good polish with a vitreous luster.