Peridot

Category	Semi-precious	Mohs hardness	7
Birthstone	August	Luster	Vitreous
Major sources	Arizona (USA), Myanmar, Pakistan	Care level	Moderate
Typical colors	Yellow-green Olive green Brownish green

What this gemstone is

Peridot is the gem-quality variety of the mineral olivine, a magnesium iron silicate with the formula (Mg,Fe)2SiO4. It is one of the few gemstones that occurs in only one color range: shades of green, from a bright yellow-green to a deeper olive or brownish green. Unlike many colored stones, peridot's color comes from iron as an essential part of its crystal structure rather than from trace impurities. It is a transparent to translucent stone with a vitreous, slightly greasy luster and a hardness of about 7 on the Mohs scale. Peridot is classified as a semi-precious gem and is the traditional birthstone for August. Its distinctive apple-green to olive tones have made it popular in both fine jewelry and more affordable fashion pieces, and it is often cut into faceted shapes or used in beads and cabochons. The stone is also sometimes called chrysolite, an older name that has largely fallen out of use in the modern trade.

How it forms and where it's found

Peridot forms in two very different geological settings. Most gem material crystallizes deep in the Earth's upper mantle, in magnesium-rich rocks called peridotite, and is brought to the surface by volcanic activity. Some peridot is also found in meteorites, which makes it one of the few gems known to exist beyond Earth. The finest crystals often occur in cavities within basalt flows, where they formed at high temperatures and were later carried upward. Major commercial sources include Arizona in the United States, Myanmar (Burma), and Pakistan, with additional production from China, Vietnam, Tanzania, and Egypt. The historic deposit on Zabargad Island in the Red Sea supplied peridot for thousands of years. Because the stone is relatively abundant, large clean crystals are more available than in many other green gems, though top-color material with strong saturation and no visible inclusions remains less common.

How to identify it

Peridot is usually easy to recognize by its characteristic yellowish-green to olive-green color, which is rarely matched by other common gems. It is strongly birefringent, meaning that when viewed through the stone, the back facets may appear doubled; this doubling is a useful clue under magnification. Under a loupe, peridot often shows distinctive inclusions such as lily-pad-shaped fractures, small chromite or biotite crystals, and sometimes fine parallel growth lines. Its refractive index and specific gravity are consistent and can be measured by a gemologist to confirm identification. Peridot is not pleochroic in a strong way, so it does not show dramatic color shifts from different viewing angles, unlike some other green stones. Common lookalikes include green tourmaline, green zircon, and certain garnets, but these differ in refractive index, birefringence, and inclusion features. Because treatments are rare in peridot, most stones on the market are simply cut and polished natural material.

Value and buying guide

Peridot value is driven mainly by color, clarity, carat weight, and cut. The most prized color is a vivid, saturated green with a slight yellow or lime tone and no brown or gray modifier. Stones that are too dark, too brown, or too pale generally sell for less. Clarity matters because peridot often contains visible inclusions; eye-clean stones command higher prices, while heavily included material is usually cut into cabochons or beads. Larger faceted stones are relatively available compared with many colored gems, but fine, clean pieces above a few carats still carry a premium. Cut quality affects brightness and sparkle, so well-proportioned faceting is important. Prices vary widely with quality, size, and market conditions, so no single figure applies. For any significant purchase, ask for a clear description of treatments and origin, and obtain an appraisal or gemological report from a qualified professional before buying.

Care and cleaning

With a Mohs hardness of about 7, peridot is reasonably durable for everyday jewelry, but it is not as tough as diamond, sapphire, or ruby. It can be scratched by harder materials and is somewhat sensitive to heat and sudden temperature changes, which may cause fractures or cleavages to worsen. The safest cleaning method is warm water with a mild dish soap and a soft brush, followed by a thorough rinse and pat dry with a soft cloth. Ultrasonic and steam cleaners are generally not recommended for peridot, especially if the stone has visible inclusions or fractures, because vibration and heat can damage it. Avoid exposing peridot to acids, harsh chemicals, or prolonged direct sunlight, and remove jewelry before sports, gardening, or heavy work. Store peridot separately from harder gems to prevent abrasion, ideally in a soft pouch or lined box. With sensible care, peridot jewelry can be worn and enjoyed for many years.

Meaning, lore, and birthstone

Peridot has been treasured since antiquity. Ancient Egyptians called it the gem of the sun and believed it protected the wearer from nightmares and evil spirits. Some historians suggest that Cleopatra's famous emeralds may actually have been peridot. In Hawaiian tradition, peridot is linked to the goddess Pele and is said to represent the tears she shed. The stone has also been associated with healing, renewal, and prosperity in various cultures, and it is sometimes given as a symbol of strength and positive energy. Peridot is the traditional birthstone for August, making it a popular gift for those born in that month, and it is also associated with the zodiac sign Leo. In modern gemstone lore, it is often described as a stone of compassion and lightness, though such meanings are cultural rather than scientific. Its consistent green color and long history give it a strong identity among semi-precious gems.

Frequently asked questions

Is peridot the same as emerald? No. Peridot is a magnesium iron silicate, while emerald is a variety of beryl. They differ in chemical composition, hardness, and typical inclusions, and peridot is generally more affordable. Can peridot be worn every day? Yes, with care. Its hardness of about 7 makes it suitable for rings, earrings, and pendants, but it can scratch and is sensitive to heat and chemicals, so it is best removed during rough activities. How should I clean peridot? Use warm water, mild soap, and a soft brush, then rinse and dry with a soft cloth. Avoid ultrasonic and steam cleaners, and do not use acids or harsh household chemicals. Is peridot treated? Treatments are uncommon; most peridot is simply cut and polished. If you are unsure about a stone, have it examined by a qualified gemologist or appraiser.