Peridot: The Gem of the Sun Complete Guide

Peridot is one of the oldest known gemstones — mined on the Egyptian island of Zabargad (St. John’s Island) in the Red Sea for over 3,500 years, prized by ancient Egyptians, Romans, and medieval Europeans who called it the “gem of the sun.” It is the only major gemstone found in only one color: a distinctive yellow-green to olive-green to vivid lime green that is entirely unique in the mineral kingdom. For the jewelry professional, peridot offers a compelling combination of ancient history, unique optical identity, accessible price, and a fascinating geological backstory — including peridot found in meteorites.

Mineralogy and Properties

Peridot is gem-quality forsterite, the magnesium-rich end member of the olivine group (Mg2SiO4). Its yellow-green to olive color is intrinsic — created by the presence of iron within the crystal structure itself rather than by trace impurities as in most other gemstones. This means peridot cannot be treated to change its color; the color is fundamental to its chemistry.

Hardness: 6.5 to 7 on the Mohs scale — moderate, suitable for most jewelry applications with reasonable care. Toughness: fair, with two directions of imperfect cleavage. Refractive index: 1.635 to 1.690 (strong double refraction — the doubling of back facets is visible through the stone with a loupe). Specific gravity: 3.27 to 3.48. Peridot is one of the few singly refractive gemstones — actually doubly refractive, showing strong birefringence that is diagnostic under magnification.

The Color Range and Value

All peridot is green — there is no other color option in this species. The range within green is significant and value-defining:

Vivid lime green / pure green — finest quality, most commercial appeal, highest value per carat

Medium yellow-green — attractive and highly commercial across all markets

Olive green / brownish-green — common commercial range, lower value

Yellowish / golden-green — lighter material, less vivid, lower value

The most desirable color is a vivid, saturated pure green with minimal yellow or brown modifier — sometimes described as “bottle green” or “lime green.” The finest specimens from Zabargad, Kashmir, and Myanmar can show extraordinary saturation in this range.

Major Sources

San Carlos, Arizona (USA)

The San Carlos Apache Reservation in Arizona is the world’s largest commercial producer of peridot by volume, accounting for approximately 80 to 95 percent of global supply in most years. San Carlos peridot ranges from commercial to occasionally fine quality. The stones are typically small (under 3ct), with a slightly brownish-yellow-green color in many specimens, though finer material approaches the vivid lime-green ideal.

Zabargad (St. John’s Island), Egypt

The oldest known peridot source, mined since antiquity. Egyptian peridot was the “topazios” of Pliny — what the ancient world called topaz was often actually peridot from this island. Production today is minimal, but fine Zabargad material still appears in the estate and antique market with significant collector interest. Zabargad peridot can show the finest, most vivid color of any source.

Myanmar (Burma)

Mogok in Myanmar also produces peridot, typically with good color and transparency. Burmese peridot can show very vivid green and represents some of the finest material available in the current market.

Pakistan (Kohistan)

Pakistan’s Sapat Gali area in the Himalayas produces high-quality peridot, often with excellent transparency and good vivid green color. Pakistani peridot has become commercially significant and represents fine quality material at accessible prices.

Norway and China

Norwegian peridot from Sunnmore is historically interesting but limited in current production. Chinese peridot from Hebei province is commercially significant at lower price points.

Extraterrestrial Peridot

One of peridot’s most remarkable stories: it has been found in pallasite meteorites — meteorites that originate in the mantle-core boundary zone of differentiated asteroids. Olivine crystals within pallasites are gem-quality peridot. Additionally, peridot has been detected in cometary dust and in the outer discs of stars by infrared spectroscopy. The volcanic Hawaiian legend that peridot tears are the tears of the goddess Pele is supported by the fact that Hawaiian peridot literally erupts from the mantle of the earth in basaltic lava flows.

This cosmic connection is a unique and powerful sales narrative: “This peridot formed in the upper mantle of the earth — the same environment where the building blocks of our planet were assembled. Olivine is one of the most abundant minerals in the earth’s mantle and has even been found in meteorites.” That story elevates any peridot sale.

Treatment in Peridot

Peridot is almost never treated — there is no established treatment protocol to improve its color or clarity because the color is inherent to its chemistry and cannot be changed. It is one of the most treatment-free gemstones in the market, alongside garnet and spinel. This is a genuine selling point: “This stone is exactly as nature made it.”

Care Requirements

Peridot requires some care given its moderate hardness and fair toughness. Avoid ultrasonic cleaners (vibration can damage tightly included stones) and avoid sudden temperature changes. Clean with warm soapy water and a soft brush. Avoid harsh chemicals. For ring settings, protective bezels or low-profile settings reduce impact risk.