Peridot
About
Peridot is a green gemstone and a variety of the mineral olivine. Its yellow-green hue is caused by the presence of iron in its composition. Unlike many gemstones, peridot is found only in one colour, though shades vary depending on iron content. Peridot has been revered since ancient Egypt, where it was mined on the volcanic island of Zabargad. Modern sources include Pakistan, Myanmar, the United States, and China.
Birthstones & Anniversaries
Peridot is the birthstone for August and is traditionally given for the 16th anniversary, symbolising strength, prosperity, and positive energy.
Crystal Healing Energy
The overarching theme of peridot is abundance and joy. Peridot is thought to bring warmth, happiness, and renewal. It is often used in crystal healing to dispel negative emotions, enhance confidence, and attract prosperity. Peridot’s energising vibration is said to inspire growth and transformation, helping individuals align with their highest potential.
Facts
Extraterrestrial Origins: Peridot has been found in meteorites, making it one of the few gems that exist outside Earth.
Historical Use: Ancient Egyptians called peridot the “gem of the sun”, associating it with Ra, the sun god.
Gem Quality: The finest peridot often comes from Pakistan’s Kashmir region, known for its vivid green colour and excellent clarity.
Colour Stability: Peridot’s colour is natural and does not fade over time, making it a durable and vibrant choice.
Volcanic Gem: Peridot often forms in volcanic environments, such as basaltic lava flows, where it crystallises under intense heat and pressure.
Science
Mineral: Olivine
Crystal System: Orthorhombic
Chemistry: (Mg,Fe)₂SiO₄
Colour: Yellow-green to olive-green
Refractive Index: 1.654 to 1.690
Birefringence: 0.036 to 0.038
Specific Gravity: 3.34 to 3.37
Mohs Hardness: 6.5 to 7
TreatmentsPeridot is generally untreated, though some stones may undergo minor enhancements like oiling to improve clarity. It is naturally free of the extensive treatments common in other gemstones.
SyntheticsSynthetic peridot is rare due to the stone’s natural abundance and affordability.
ImitationsGlass and green synthetic spinel are commonly used as peridot imitations. These materials may mimic the colour but lack the optical and physical properties of natural peridot.
similar materialsGreen Tourmaline: A darker green gemstone with higher hardness and a different crystal structure.
Chrysoberyl: A greenish-yellow gemstone that can resemble peridot but is harder and lacks the same vibrant hue.
Demantoid Garnet: A bright green garnet that is rarer and typically has higher brilliance than peridot.