Prasiolite is a green quartz that is colored by inclusions of minerals within the stone. It is actually a variety of quartz called quartz chalcedony that has been altered by heat or radiation to produce its vivid green coloration. The name prasiolite comes from the Greek words "prason" meaning leek or green, and "lithos" meaning stone. It is sometimes referred to as "green amethyst" as well.
Natural prasiolite is quite rare, occurring in isolated pockets within some geodes and volcanic rock. Most commercial prasiolite seen today is actually created artificially through a heating process. Natural amethyst is heated to temperatures between roughly 150-400 degrees Celsius, which causes the purple color to leech out and be replaced by a range of green hues. This heat-treated quartz is then cut and polished to produce prasiolite gemstones for jewelry.
The most prized variety of prasiolite is a bright spring green color, with even saturation and tones that are lively but not too dark. Greenish-yellow and olive-colored stones are less desirable. Prasiolite is generally transparent with a vitreous luster. Well-cut stones exhibit excellent brilliance and flashes of light. The refractive index of prasiolite is 1.54-1.55 and its hardness ranks a 7 on the Mohs hardness scale, typical values for quartz.
While prasiolite is not technically a natural stone, the heating process does mimic what happens when amethyst comes into contact with hot lava or is altered by heat within the earth. So cultured prasiolite still has an exciting backstory and a connection to volcanic origins. It also remains a rare and unique green gemstone in the quartz family.
Prasiolite jewelry features all of the glittering translucence of amethyst but with an eye-catching green color that stands out. While the green tones lend themselves well to spring and summer looks, prasiolite really works with any outfit from day to night. It has a fresh, lively energy that pairs equally well with casual daytime outfits or glamorous cocktail attire.
Due to its rarity, prasiolite costs more than traditional amethyst but it is still affordable for many budgets, especially set in sterling silver. Because it is a quartz stone, prasiolite is very durable and makes an excellent choice for rings and other jewelry that will be worn often. Its resistance to scratching and chipping allows it to maintain its sparkling beauty for many years to come.
So next time you come across a glittering green gemstone, take a closer look. It just may be the mysterious and captivating prasiolite! The unusual green shade of this heated quartz is sure to catch eyes and spark conversations.
