Peridot Buying and Care Guide: August's Green Birthstone
Peridot is the green stone for August, and every peridot ever mined is green. Always, because of how the mineral is built. That one fact explains most of what you need to know about buying one, and it sits next to a weakness nobody mentions at the counter until you ask. Here is the full picture, including the parts that argue against putting one on your finger.
Why peridot cannot be any other colour
Peridot is the gem-quality form of a common mineral called olivine, which makes up a large share of the earth's upper mantle. GIA describes peridot as the gem variety of the mineral olivine, with a chemical composition that includes iron and magnesium, and identifies iron as the cause of its yellowish green colours.
That word "includes" is doing heavy lifting. In most coloured stones the colour arrives as a passenger. Corundum is colourless on its own; add a trace of chromium and you get ruby, add iron and titanium and you get blue sapphire. Beryl works the same way, which is why one mineral can be green emerald, blue aquamarine, or pink morganite.
The iron in peridot is part of the required recipe. Gemmologists call this an idiochromatic stone, a long word for a simple idea: the thing that makes the colour is the same thing that makes the mineral. Remove the iron and you hold a different mineral entirely.
So the shopping question is never what colour peridot you can get. It is how much brown sits in the green, and the ratio of iron to magnesium in that one crystal decides it.
Reading the colour range
GIA calls the colour range for peridot narrow, running from a brown-green through yellowish green to pure green. Those three points are the whole map.
Brown-green is the bottom, and brown is the modifier that kills a peridot. It reads dull rather than dark, and it worsens under warm indoor lighting, which is where the stone spends most of its life.
Yellowish green is the middle and the commonest. GIA notes that while the best peridot is a pure grass green, most peridot is yellowish-green. A clean, bright yellow-green stone at 6mm is a good buy.
Pure green is the top, and it is where the price sits. GIA states that the finest hue is green without any hint of yellow or brown. Those stones tend to be larger, which is why fine peridot and big peridot usually arrive together.
Our counter test takes ten seconds. Set the stone on a white card. If your eye finds the green first, buy it. If it finds a tired olive, put it back.
| Stone | Mohs hardness | Toughness | Ultrasonic safe? | Our daily-ring verdict |
|---|---|---|---|---|
| Diamond | 10 | Good to excellent | Usually yes | Yes, any setting |
| Sapphire and ruby | 9 | Excellent | Usually yes | Yes, any setting |
| Peridot | 6.5 to 7 | Fair to good | No | Protective setting only |
| Amethyst | 7 | Good | Usually yes | Protective setting only |
Where peridot comes from, including off this planet
GIA lists peridot deposits in the United States, China, Vietnam, Finland, Pakistan, Myanmar, and the island of Zabargad. Two of those deserve more than a line.
Zabargad, a small island in the Red Sea, is the oldest name in the trade. GIA records that the ancient Egyptians mined peridot there, and that the island is the source for many of the large fine peridots held in the world's museums. When an old text describes a historic Egyptian emerald, there is a fair chance the writer was looking at peridot.
The American supply runs through Arizona. GIA's Gems & Gemology reports that basalt-topped Peridot Mesa, on the San Carlos Apache Reservation, is a major source each year for thousands of carats of gem-quality peridot in sizes suitable for modern jewellery. That material runs yellow-green in smaller sizes, which suits calibrated stones for standard settings. For the large clean ones, GIA points to Myanmar and, more recently, a source high in the Himalayas of Pakistan.
The meteorite peridot
This is the part that makes people put their phone down. GIA notes that peridot can rarely have an extraterrestrial source, contained in meteorites that have fallen to earth, and that some of those crystals are large enough to facet as cut gemstones.
Those meteorites are called pallasites, a stony-iron type formed inside early asteroids. GIA's laboratory reports that faceted pallasitic peridot usually weighs under half a carat, and that a 2.32-carat stone examined in its Carlsbad lab was the largest extraterrestrial peridot the institute had seen to that date. We do not stock it, and we would be careful with anyone claiming to have much of it. Still, the same green mineral forming inside asteroids and inside our own planet's mantle is worth knowing about the stone on your neck.
Durability: the honest version
That sentence carries two separate warnings.
Scratching. At 6.5 to 7, peridot sits at the hardness of quartz, and ordinary household dust contains quartz particles. That is how a coloured stone worn every day goes from sharp to soft-looking over a few years. Our guide to jewellery care by gemstone hardness ranks every stone we sell.
Fracturing. Toughness measures resistance to chipping rather than scratching, and fair to good is a middling score. Knock a peridot ring against a door frame at the wrong angle and it can chip at the girdle.
Two hazards are specific to this stone. GIA warns that rapid or uneven heat can cause peridot to fracture, and that the stone is easily attacked by sulfuric acid, less easily by hydrochloric acid, and can be attacked over a long period by acid perspiration. The same page confirms peridot is stable to light, so a sunny holiday does nothing to the colour.
Cleaning, in one paragraph
GIA names warm soapy water as the best method for cleaning peridot and advises against ultrasonic and steam cleaners. Use lukewarm water, a drop of dish soap, and a soft toothbrush around the setting. Rinse, pat dry. Skip the machine at the mall counter and tell whoever is behind it that the stone is peridot. Any jeweller who reaches for the ultrasonic anyway is not paying attention.
Treatment: the quiet advantage
Heating, irradiation, diffusion and fracture filling are routine across the coloured stone counter, so a gem that mostly arrives as it left the ground is worth something, and the price reflects the stone rather than a process. Ask for it in writing anyway. We put treatment status on the receipt, and a shop that will not do that is asking you to trust a stranger about the one thing you cannot see.
What to buy, and in what
Pendants and earrings are the easy answer, and the choice costs you nothing. A pendant never scrapes a countertop, never takes a knock from a car door, and lives away from the dishwater. Peridot at 8mm or 10mm on a chain gives you real colour for what a tiny sapphire would cost. Earrings work for the same reason. Yellow gold warms the green; white gold or platinum reads cooler. We usually reach for yellow.
Rings are fine with conditions. Use a bezel or a low half-bezel so metal protects the edge of the stone, keep the stone under 8mm so it sits close to the finger, and take the ring off for cleaning, gardening, the gym, and hot water. Anyone who wears a ring for a night out and drops it in a dish at home will have no trouble. Anyone who never takes theirs off should buy sapphire and wear peridot on a chain.
For how the other eleven months compare, our birthstone guide covering what each month's gem means runs through the full list.
Peridot and coloured stone pendants in the shop
A selection of pendants currently in our Coquitlam cases. Stock changes weekly, so call ahead if you want a specific stone held.
Key Takeaways
- Peridot is always green because iron is a required part of olivine's chemistry rather than a trace impurity, so only the shade varies, from brown-green through yellowish green to pure green.
- Buy for the absence of brown. GIA calls the finest hue green without any hint of yellow or brown, and most market stones sit in the yellowish green middle.
- At Mohs 6.5 to 7 with fair to good toughness, peridot needs a protective setting in a ring and belongs off the hand for chores, the gym, and hot water.
- Clean with warm soapy water only. Ultrasonic machines, steam cleaners, rapid heat changes, and years of unrinsed sweat are the four things that damage this stone.
- Peridot is rarely treated, which makes it one of the few coloured stones where the colour you pay for is the colour the earth made. Get the treatment status in writing regardless.
Frequently Asked Questions
Why is peridot always green?
Because the green comes from the stone's own recipe rather than from a stray impurity. Peridot is the gem form of a mineral called olivine, and GIA notes that its chemical composition includes iron and magnesium, with iron causing the yellowish green colour. Iron is a required ingredient here, so every peridot that exists has the colouring agent built in. Compare that with sapphire, where the blue depends on traces of iron and titanium wandering into a colourless crystal. Take those traces away and you get a white sapphire. Take the iron out of peridot and you no longer have peridot at all. The practical result is that you will never find a red one, a blue one, or a colourless one. The shade shifts with how much iron is present, which is why the range runs from brownish green through yellow-green to a clean grass green, and that is the whole range.
What colour of peridot should I buy?
Look for green with as little brown in it as you can afford. GIA puts it plainly: the finest hue is green without any hint of yellow or brown, and most peridot on the market sits in the yellowish green part of the range. Brown is the modifier that hurts a stone most, because it makes the green read muddy under shop lighting and worse under a home lamp. A touch of yellow is normal and many people prefer it, since it gives that warm lime look people associate with the stone. Judge colour in two places before you buy: near a window, and under an ordinary indoor bulb. Peridot holds its colour well between light sources, so if it looks dull in one of them the stone itself is the problem. We will hand you a loose stone and let you walk it to the window.
Is peridot hard enough for an engagement ring?
It can work, with the right setting and the right owner. GIA places peridot at 6.5 to 7 on the Mohs hardness scale with fair to good toughness, and describes it as durable enough for jewellery wear but needing some care so it is not scratched or subjected to hard blows that can fracture it. For comparison, diamond is 10 and sapphire is 9. Household dust contains quartz at 7, which is why a peridot ring worn through cooking and cleaning slowly goes hazy on the top facets. Our honest recommendation: choose a bezel or a low half-bezel that protects the edge of the stone, pick 14K over 18K for a firmer setting, and be the kind of person who takes a ring off for dishes and the gym. If that last part sounds unlikely, put peridot in a pendant and choose sapphire for the ring. We talk through the same trade-off in our guide to coloured gemstone engagement rings.
How do I clean peridot at home?
Warm water, a drop of dish soap, and a soft toothbrush. GIA lists warm soapy water as the best method for cleaning peridot and says ultrasonic and steam cleaners are not recommended. That warning is worth taking seriously. An ultrasonic machine shakes the stone thousands of times a second, and a peridot with a small fracture inside can split along it. A steamer is worse, because it combines heat with speed, and GIA states that rapid or uneven heat can cause peridot to fracture. So: lukewarm water, never hot, never straight from the kettle. Brush gently around the setting where skin oil collects, rinse, and pat dry with a soft cloth. Do this once a month and the stone stays bright. If the ring needs more than that, bring it to our bench and we will clean it by hand.
Can sweat really damage peridot?
Over a long stretch of time, yes. GIA states that peridot is easily attacked by sulfuric acid, less easily by hydrochloric acid, and can also be attacked over a long period of time by acid perspiration. Nobody loses a peridot to one hot afternoon. What happens is slower: years of wearing the same ring through workouts without rinsing it, and the polish on the exposed facets goes soft and hazy. Fixing it means a repolish, which removes a thin layer of stone. The habit that prevents it costs nothing. Take the ring off before the gym, and if you forget, rinse it under lukewarm tap water when you get home and dry it. Skin chemistry varies, so some people see this and others never do. If your silver tarnishes fast, assume you are on the acidic end and be stricter about rinsing.
Why does peridot crack from temperature change?
The stone does not expand evenly when heat hits one part of it faster than another, and that mismatch pulls it apart from the inside. GIA is direct about it: rapid or uneven heat can cause peridot to fracture. In daily life this shows up in ordinary places. Washing dishes in hot water after coming in from the cold. Sitting close to a fire or a patio heater in winter. A jeweller repairing a ring with a torch while the stone is still in the setting, which is why our bench removes peridot before any hot work rather than trying to shield it. Cold is the other half of the same problem, so do not leave a peridot ring on a car dashboard in July and then run it under cold water. Let the stone change temperature at the same pace as the room and it will be fine.
Is peridot treated, and does that matter?
Peridot is one of the honest stones on the counter. GIA's peridot buyer's guide says peridot is rarely treated, though it might have fractures, and that fracture-filled stones should only be cleaned with warm soapy water. That is a real selling point once you know what the alternative looks like. Most blue topaz on the market is irradiated. Most citrine is heated amethyst. A large share of ruby and sapphire has been heat treated, and some emerald arrives with oil or resin in its fractures. With peridot, the green in front of you is the green the earth made. Ask the seller to state in writing that the stone is untreated anyway, because a small number of peridots do get fracture filling, and that changes how the stone must be cleaned for the rest of its life. Any seller who cannot answer the question in one sentence is telling you something.
What size and price should I expect?
Small peridot is one of the better values in coloured stone. GIA notes that gems cut to standard calibrated sizes are affordable and readily available, while the finest stones are generally seen above 10 carats. Price does not climb in a straight line. GIA points out that peridot is inexpensive in smaller sizes but prices rise for gems above 10 by 8 millimetres, which is where the supply of clean rough thins out. For most buyers that pricing shape is good news, because a 6mm or 7mm round peridot with clean colour costs a fraction of what the same size in fine sapphire would. Clarity expectations are high too: GIA says most better-quality material on the market has no eye-visible inclusions, with tiny black mineral crystals visible only under magnification. Buy an eye-clean stone. There is no reason to accept less.
Where does peridot come from?
More places than people expect, including outer space. GIA lists deposits in the United States, China, Vietnam, Finland, Pakistan, Myanmar, and the island of Zabargad. The American production is centred in Arizona, where GIA's Gems & Gemology reports that Peridot Mesa on the San Carlos Apache Reservation is a major source for thousands of carats of gem-quality peridot each year in sizes usable in jewellery. For large fine stones, GIA points to Myanmar and, more recently, a source high in the Himalayas of Pakistan. Zabargad in the Red Sea is the historic one, and GIA records that the ancient Egyptians mined it there, making it the source of many of the large fine peridots now sitting in museums. Then there are meteorites, which is a category of its own.
Sources
- GIA: Peridot Care and Cleaning Guide
- GIA: Peridot Description and Gemstone Properties
- GIA: Peridot Quality Factors
- GIA: Peridot Buyer's Guide
- GIA Gem Encyclopedia: Peridot
- Gems & Gemology, Winter 1981: San Carlos Peridot by John I. Koivula
- Gems & Gemology, Winter 2022 Lab Notes: Large Faceted Pallasitic Peridot
Data sourced September 2026. Setting and wear recommendations come from repair work on our own bench in Coquitlam. If a source page changes, tell us and we will update the guide.
Visit Vanhess
We are a family-run studio at 2929 Barnet Highway in Coquitlam, and we designed and made most of what sits in our cases. If August is your month, come and look at peridot next to a window rather than under a spotlight, because that is the light you will actually wear it in. We will tell you honestly whether the stone you like belongs in a ring or on a chain, and we will set it either way. Call us at +1 (604) 653-6449.
