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TurquoiseAugust Birthstone Meaning: Three Stones, One Added in 2016
In August 2016 the American trade added spinel to a month that already held two gems. So August birthstone meaning now answers three ways: peridot, traditionally tied to release and renewal, sardonyx to courage and steady friendship, and spinel to a reputation that writers are still assembling in public.
- Release
- Nerve after dark
- Steady luck
How Did August End Up With Three Official Stones?
By starting with two and gaining a third a century later. The 1912 American list already gave the month a pair, sardonyx and peridot together, so this was never a single-stone slot the way February or April is. Then in August 2016 the American Gem Trade Association and Jewelers of America announced spinel as an addition, the first change to the national list since tanzanite came in for December in 2002. All three names describe a calendar month and say nothing about a zodiac sign.
The three sit at very different places in the market. Peridot is what a shop means when it says the month stone, affordable small and scarce above a few carats. Sardonyx is the old answer, carved more often than faceted, and it turns up in bead strands and cameos more than in rings. Spinel is the connoisseur entry, priced well below ruby for a red of similar intensity. A gift labeled for the month will almost certainly be peridot.
What August’s Stones Are Said to Mean
The August birthstone meaning splits three ways, one per stone, and the three are not evenly served. Two of these three stones arrive with centuries of folklore attached and the third arrives with almost none, which is the most interesting thing in this section. Where a tradition is thin the page says so, and none of it has been tested either way.
Peridot
Night is the recurring theme. Egyptian tradition treated the green stone as a fragment of trapped sunlight, worn as a guard against the terrors that arrive after dark, and medieval European clergy who received it through the Crusades read it as a sign of moral clarity. Crystal healing practice keeps the release idea: peridot is traditionally believed to loosen resentment, envy and guilt. All of it is inherited belief, and none of it has been shown to happen.
Sardonyx
Roman soldiers are said to have carried sardonyx engraved with Mars into the field, and the folklore has stayed close to courage and to keeping promises ever since. Later European tradition made it a stone of stable friendship and marital steadiness, a reading that put it into a great many Renaissance betrothal cameos. These are traditional associations recorded across two thousand years of writing, and they remain beliefs.
Spinel
Almost no folklore attaches to spinel under its own name, because the trade spent centuries calling it ruby. Whatever protective virtue a medieval owner assigned to a great red stone was assigned to something they believed was corundum. Crystal healing writers have been filling the gap since 2016, traditionally associating spinel with energy and endurance, young enough that a reader can watch a tradition being assembled.
August Stone Color and Mineralogy
Three stones means three sets of numbers. Every figure and locality below is quoted from a published reference, and all of them appear in the References list.
Peridot
Peridot is gem-quality olivine, and olivine is the most abundant mineral in the upper mantle, so the raw material is anything but rare. Getting it up intact is the hard part. Iron belongs to the formula itself, with no trace impurity involved, so every specimen is green and there is no colorless or blue version to hunt for. Volcanic eruptions carry lumps of mantle rock to the surface as passengers in basalt, and gem crystals are picked out of those lumps. A second route is stranger: pallasite meteorites, where olivine grains sit suspended in iron-nickel metal, occasionally yield faceted stones.
| Mineral | Olivine (Forsterite) |
| Formula | (Mg,Fe)₂SiO₄ |
| Hardness | Mohs 6.5 |
| Crystal System | Orthorhombic |
| Colors | Olive green, Yellow-green, Lime green |
| Sources | Arizona (USA), Myanmar, Pakistan, China, Vietnam |
Spinel
Spinel is magnesium aluminum oxide, cubic like diamond and garnet, and it grows in marble alongside corundum in several of the same deposits. That shared address is exactly why the two were confused for so long. The Black Prince's Ruby in the Imperial State Crown and the Timur Ruby in the Royal Collection are both red spinel, and mineralogy caught up only in the 1780s when Romé de l'Isle separated the species. Chromium produces the red, iron the grey and blue tones, and cobalt a rare vivid blue that outprices everything else here.
| Mineral | Spinel |
| Formula | MgAl₂O₄ |
| Hardness | Mohs 8 |
| Crystal System | Cubic |
| Colors | Red, Pink, Blue, Lavender, Orange, Black |
| Sources | Myanmar, Sri Lanka, Tanzania, Tajikistan, Vietnam |
Sardonyx
Sardonyx is banded chalcedony, a microcrystalline quartz built from fibers too fine to see, alternating brownish-red layers of sard with white or cream onyx. Those parallel bands are the whole point of the stone. Carvers cut down through a pale layer into a dark one to leave a light figure standing on a dark ground, which is how classical cameos were made, and the Gemma Augustea in Vienna is a two-layer sardonyx panel from the first century. Much banded chalcedony sold today has been dyed, a treatment as old as Rome that should still be disclosed.
| Mineral | Chalcedony (Quartz group) |
| Formula | SiO₂ |
| Hardness | Mohs 7 |
| Crystal System | Trigonal |
| Colors | Reddish-brown and white bands, Orange and white, Brown and cream |
| Sources | India, Brazil, Germany, Czech Republic, Uruguay |
Which Zodiac Signs Cover August Birthdays?
The month divides between Leo and Virgo, with the change falling on the 23rd. Leo holds birthdays through August 22, and Virgo runs from August 23 into September. Peridot is also the modern zodiac stone for Leo, so an August 8 birthday gets the same gem from the calendar and from the sign. August 28 breaks that agreement: the calendar still offers all three stones, while Virgo answers blue sapphire, which belongs to September on the month chart. Both systems are doing what they were built for. One list was drawn up by a trade association for retail counters; the other grew out of centuries of astrological writing, and nothing has ever been done to align the dates.
Can You Wear August’s Stones Every Day?
Three stones, three separate weak points, and the hardness column predicts none of them alone. Spinel at Mohs 8 is cubic with no cleavage and handles daily wear better than most gems in a case. Sardonyx at Mohs 7 resists breaking because its structure is fibrous, and its risk is chemical. Peridot at Mohs 6.5 is the fragile one, undone by acid and by sudden temperature change.
- Keep peridot away from ultrasonic and steam cleaning entirely. Thermal shock cracks it, and included stones crack first. Hand-wash it in warm water with a little dish soap and nothing stiffer than a baby toothbrush.
- Wipe peridot after wear. Sweat is mildly acidic and household cleaners more so, and acid etches the polish off the surface in a way no cloth restores.
- Set peridot low, or wear it as earrings or a pendant. At Mohs 6.5 it sits below the quartz dust in ordinary household air, so a raised ring stone hazes over a few years of daily wear.
- Ask whether banded chalcedony has been dyed before cleaning it with anything stronger than soap. Acetone, alcohol and jewelry dips can lift color out of dyed sardonyx and leave the bands muddy.
August Birthstone Questions People Ask
What are the three August birthstones?
Peridot, spinel and sardonyx. Peridot and sardonyx were both on the original 1912 American list, and spinel was added in 2016 by the American Gem Trade Association and Jewelers of America. All three are official; peridot is what shops stock.
Why was spinel added to the August list?
The trade bodies who maintain the list wanted to recognize a gem that had spent centuries misidentified as ruby and was still overlooked. Spinel offers strong reds and pinks at a fraction of corundum prices. It was the first change since 2002.
Is the August birthstone too soft for an engagement ring?
It is on the soft side for one. At Mohs 6.5 peridot sits below the hardness of airborne quartz dust, so a daily ring stone gradually loses its polish, and it also dislikes acids and heat. A protective setting helps. Spinel is the durable choice among the month's three.
What is the difference between sardonyx and onyx?
Both are banded chalcedony, and the bands separate them. Onyx alternates black with white; sardonyx alternates the brownish-red layer called sard with cream or white. Carvers preferred sardonyx because the warm layer reads as skin tone against a pale ground.
Is spinel a real gemstone or a substitute for ruby?
It is a species in its own right, magnesium aluminum oxide, unrelated to corundum beyond a habit of growing in the same marble. Several famous historical rubies turned out to be spinel. Synthetic spinel circulates as a cheap simulant, so ask for a report on anything expensive.
What does August peridot stand for in folklore?
Letting go, mostly. Egyptian belief treated it as a solar stone guarding against night terrors, and crystal healing practice traditionally associates it with releasing resentment, envy and guilt. These are documented beliefs and not measured effects.
The August birthstone list is the busiest slot on the chart and the easiest to shop badly: peridot is what you will be shown, sardonyx is what the oldest lists meant, and spinel is the one to ask about for a piece worn every day. Settle the durability question first, check the mineral claims against the citations below, and take the August birthstone meaning as the tradition it is labeled as.
References
- Peridot — Gemological Institute of America (GIA)
- Peridot — International Gem Society
- Spinel — Gemological Institute of America (GIA)
- Spinel — International Gem Society
- Sardonyx — Gemological Institute of America (GIA)
- Sardonyx — International Gem Society
“The safest cleaning methods are also the easiest.”
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