What is Peridot?
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A gem-quality variety of the mineral olivine
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Known for its distinctive green colour
Peridot is the gemstone form of olivine, a mineral made of magnesium iron silicate. Unlike many gemstones that come in a wide range of colours, Peridot is always green. The exact shade can vary from yellow-green to deep olive, depending on how much iron is present.
This consistency makes Peridot unusual. Its colour is not caused by trace impurities but by its core chemical makeup. When you see Peridot, you are seeing the mineral exactly as nature created it.
Peridot is transparent when gem-quality and can display a bright, lively sparkle when well cut.
How Does Peridot Form?
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Forms deep within the Earth’s mantle
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Brought to the surface by volcanic activity
Peridot forms far below the Earth’s crust, in the upper mantle, at depths of up to 90 kilometres. This is much deeper than where most gemstones form. Under intense heat and pressure, olivine crystals grow within mantle rocks.
Volcanic eruptions then act as a natural elevator, carrying these crystals to the surface inside volcanic rock. Over time, erosion releases the crystals, making them accessible for mining.
In rare cases, Peridot has also been found in meteorites, making it one of the few gemstones known to originate beyond Earth.
Where Is Peridot Found?
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Found in volcanic regions worldwide
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Some sources are especially famous
Peridot is found in several parts of the world, often associated with volcanic activity. Important sources include Myanmar, Pakistan, China, Vietnam, the United States, and parts of Africa.
One of the most historically significant sources is a small island in the Red Sea, which supplied Peridot to ancient civilisations. Today, some of the finest stones come from mountainous regions where crystals grow larger and clearer.
The United States is also a notable producer, with Peridot mined in desert regions formed by ancient lava flows.
Properties of Peridot
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Moderate hardness suitable for jewellery
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Bright sparkle with proper cutting
Peridot measures 6.5 to 7 on the Mohs hardness scale, which makes it harder than glass but softer than sapphire or diamond. This means it can be worn regularly but should be treated with care.
It has a vitreous lustre and a refractive quality that gives it a lively appearance in good lighting. However, Peridot is sensitive to acids, heat, and sudden temperature changes.
Jewellers cut Peridot carefully to maximise brilliance while protecting the stone’s edges.
Name Origin
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Name likely linked to ancient terms for gemstones
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Associated with brightness and richness
The exact origin of the name “Peridot” is debated. Some scholars trace it to Arabic words relating to gemstones, while others connect it to French terms used in medieval Europe.
What is clear is that the name has been used for centuries to describe this green gem. In ancient times, Peridot was often confused with emerald, especially in low light.
Its modern name reflects a long history of admiration and occasional misunderstanding.
Pricing and Value
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Generally affordable compared to many gemstones
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Price increases with size and colour quality
Peridot is considered an accessible gemstone, making it popular for everyday jewellery. Small to medium stones are widely available and reasonably priced.
As a general guide, commercial-quality Peridot can cost modest amounts per carat, while fine stones with rich colour and high clarity can reach several hundred pounds per carat. Larger stones over five carats increase sharply in value, as clean material becomes rarer.
Peridot offers excellent visual impact for its price, which is one reason jewellers love it.
History of Peridot
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Known and worn for thousands of years
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Highly valued in ancient cultures
Peridot has one of the longest recorded histories of any gemstone. Ancient Egyptians mined it as early as 1500 BCE and believed it protected against fear and darkness.
During the medieval period, Peridot appeared in church treasures and royal collections across Europe. Many famous “emeralds” from this era were later identified as Peridot.
Its popularity faded and returned several times throughout history, but it has never truly disappeared from jewellery use.
Lab Grown Peridot
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No commercial lab-grown Peridot market
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Natural stones dominate jewellery use
Unlike some gemstones, Peridot is not commonly grown in laboratories for jewellery. While olivine crystals can be created for research, producing gem-quality Peridot synthetically is not cost-effective.
Natural Peridot is readily available and affordable, reducing demand for lab-grown alternatives. As a result, Peridot jewellery almost always contains natural stones.
This makes identification simpler for buyers.
Is Peridot Used in Jewellery?
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Widely used in many jewellery styles
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Suitable for both modern and classic designs
Yes, Peridot is very popular in jewellery. It is used in rings, earrings, pendants, bracelets, and necklaces. Its cheerful green colour pairs well with both yellow and white metals.
Because it is moderately hard, Peridot is suitable for daily wear when set securely. Protective settings are recommended for rings.
Designers often use Peridot as a centre stone or as an accent gem alongside diamonds.
Where Else Is Peridot Used?
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Used mainly as a gemstone
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Also valued in scientific contexts
Outside jewellery, Peridot’s mineral form, olivine, is studied and sometimes used industrially. Olivine-rich rocks are used in foundry sand and refractory materials.
Meteorite Peridot specimens are collected by scientists and museums due to their extraterrestrial origin.
However, its main public role remains decorative rather than industrial.
Why Is Peridot Studied?
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Offers insight into Earth’s mantle
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Helps scientists study planetary processes
Peridot is studied because it provides a rare glimpse into the Earth’s interior. Since it forms in the mantle, its composition helps scientists understand conditions far below the surface.
Peridot found in meteorites also helps researchers learn about the formation of other planets and the early solar system.
For gemmologists, Peridot is important for understanding natural colour and crystal structure.
Conclusion
Peridot is a gemstone that balances history, beauty, and approachability. It is ancient but fresh, scientific but emotional, rare in origin yet widely enjoyed.
As a jewellery expert, I see Peridot as one of the most honest gemstones. What you see is what nature made, with no enhancements needed. Its green colour speaks of growth, warmth, and vitality.
Whether worn as jewellery, studied by scientists, or admired for its story, Peridot continues to earn its place as one of the world’s most likeable gemstones.
FAQ
Is Peridot a precious gemstone?
It is considered a semi-precious gemstone, valued for colour and clarity rather than rarity.
Can Peridot be worn every day?
Yes, with care. Secure settings are recommended, especially for rings.
Why is Peridot always green?
Its colour comes from iron in its crystal structure, not from impurities.
Is Peridot expensive?
Most Peridot is affordable, though fine, large stones can be valuable.
Is Peridot a birthstone?
Yes, it is traditionally associated with August.