August Birthstones: Peridot, Sardonyx & Spinel Meanings

What Are August's Birthstones?

August has three birthstones: peridot, sardonyx, and spinel. Peridot is a vivid yellow-green gem long associated with light and healing, sardonyx is a banded, reddish-brown stone tied to courage and clear communication, and spinel is a brilliant, often pink or red gemstone symbolizing hope and revitalization. Anyone born in August can choose whichever stone best matches their style, budget, or the meaning they want their birthstone jewelry to carry.

Having three official birthstones makes August one of the more versatile months on the birthstone calendar. Peridot is prized for its intense, almost glowing green color and is found in several locations worldwide, though some of the finest specimens still come from volcanic deposits similar to those mined in antiquity. Sardonyx is formed from alternating layers of sard and onyx—two varieties of the mineral chalcedony—creating a striking reddish, zebra-striped gem with crisp white bands. Spinel, meanwhile, occurs in a surprising range of colors but is most sought after in vivid pink and red, shades so convincing they were historically mistaken for ruby.

August Birthstones and the Zodiac: Leo and Virgo

August spans two zodiac signs, Leo (through roughly August 22) and Virgo (from roughly August 23). Peridot, sardonyx, and spinel are often worn alongside—or in place of—traditional zodiac crystals to amplify the energy associated with each sign. Confident, warm-hearted Leos are frequently drawn to peridot's sunny glow and spinel's bold color, while detail-oriented, grounded Virgos often connect with sardonyx's steady, protective symbolism.

If you want to explore stones matched specifically to your sign, see our guides to crystals and stones for Leo and crystals and stones for Virgo for a deeper look at how birthstones and zodiac stones work together.

How to Choose Between the Three

• Choose peridot if you want a vivid, affordable green gemstone associated with light, healing, and positivity.
• Choose sardonyx if you prefer a historic, banded gem with strong ties to courage and is well-suited to cameos and statement jewelry.
• Choose spinel if you want a durable, daily-wear gemstone that rivals ruby and sapphire in brilliance and hardness.
• Consider your budget: peridot is generally the most accessible, while fine red or pink spinel can command prices closer to precious gems.
• Consider lifestyle: spinel's hardness (8 on the Mohs scale) makes it the most practical choice for rings worn every day.

Origin and History of Peridot, Sardonyx, and Spinel

Peridot, known mineralogically as olivine, has a history tracing back to ancient Egypt. The gemstone was mined on a volcanic island in the Red Sea once called Topazios, now known as Zabargad. Some historians believe Cleopatra's famed "emeralds" may actually have been peridot, though this remains a theory rather than a confirmed fact.

Sardonyx has a history running back more than 4,000 years to Ancient Egypt. The Romans also prized it highly, carving the stone into cameos and seals used to sign official documents.

Spinel was mistaken for ruby for centuries. Many of the world's most famous "rubies" have since been identified as spinel, including the "Black Prince's Ruby" and the "Timur Ruby," both part of the British Crown Jewels.

The Mythology and Symbolism of Peridot, Sardonyx, and Spinel

Peridot, often associated with light, was called "the gem of the sun" by the ancient Egyptians. In folk tradition, peridot has long been regarded as a protective talisman believed to ward off evil spirits and "terrors of the night," with some also crediting it with bringing rest, peace, and luck.

Sardonyx was believed to instill courage, happiness, and clear communication. Roman soldiers carried sardonyx talismans engraved with heroes such as Mars or Hercules, believing the stone would make them as courageous as the figures depicted on it.

With its own distinct identity, spinel has always been considered a stone of revitalization and hope. It is said to help the wearer set aside ego in favor of devotion to another person.

The Various Facets of Peridot, Sardonyx, and Spinel

Peridot's value comes from its color, clarity, cut, and size. The darkest olive-green peridots, which contain more iron, tend to be the most prized and brightly colored. Stones can range from tiny, diamond-quality crystals to large boulders cut from rock.

Sardonyx, by contrast, is valued more for its color than for translucency. Unlike many other gems, the distinct bands running through sardonyx add value rather than detract from it. The stone is most often worked into cabochons or carved into cameos.

Color, size, and availability strongly affect the value of spinel. The most sought-after colors are hot pink and ruby red, though spinel also occurs in blue, black, and purple. It is most commonly cut into cushion and oval shapes, though round, emerald, and pear cuts are also used.

Physical Properties of Peridot, Sardonyx, and Spinel

Peridot is a comparatively soft stone, rated 6.5–7 on the Mohs hardness scale. It is vulnerable to sudden temperature changes, which can cause it to crack or fracture.

Sardonyx ranks 6–7 on the Mohs scale. It is generally stable in light and does not react when exposed to acids. It is also durable enough to be used across many types of jewelry.

Spinel is notably hard at 8 on the Mohs scale, making it a durable gem suitable for everyday jewelry, from rings worn daily to more delicate pieces like earrings and pendants.

Peridot, Sardonyx, and Spinel in Jewelry Design

Peridot's vivid green pairs well with a wide range of metals and gemstones. It's often fashioned into standard faceted cuts, though more artisan cuts are increasingly popular too. It's commonly found in rings, earrings, pendants, and bracelets, and pairs beautifully with purple accents like amethyst crystals for a bold, contrasting look.

Because of its layered structure, sardonyx is most often cut en cabochon and used in cameos, intaglios, brooches, and beads. When set in jewelry, it's typically shaped into a smooth, flat oval, and the deep brown layers are sometimes dyed black to make the white bands stand out more clearly—an effect reminiscent of the layered luster found in mother-of-pearl jewelry.

Spinel is an exceptionally versatile gemstone suited to rings, necklaces, bracelets, and earrings. It can be faceted to heighten brilliance and is crafted into a wide range of cuts to suit different jewelry styles.

How to Care for and Clean Jewelry with Peridot, Sardonyx, or Spinel

All three stones require similar care. Protect them from high temperatures and harsh chemicals, and clean them with warm soapy water and a soft brush. When not being worn, wrap each piece in a soft cloth or store it in a fabric-lined box to prevent scratches.

Conclusion: The Timeless Appeal of Peridot, Sardonyx, and Spinel

Peridot, sardonyx, and spinel are perennial favorites for those fortunate enough to be born in August. Whether you're drawn to the lively green of peridot, the bold bands of sardonyx, or the vibrant, varied hues of spinel, these August birthstones make for meaningful and beautiful jewelry pieces that suit nearly any style or budget.

FAQ

What is the main August birthstone?

Peridot is generally considered the primary August birthstone and is the one most widely recognized and sold. However, sardonyx and spinel are also officially recognized birthstones for the month, giving August residents three legitimate options rather than just one.

Is peridot or sardonyx more valuable?

Peridot is typically more valuable than sardonyx, as it is a transparent gemstone valued for color, clarity, and cut, while sardonyx is an opaque, banded stone valued mainly for its pattern. That said, antique or finely carved sardonyx cameos can command higher prices due to craftsmanship and history.

Can I wear spinel every day?

Yes, spinel is an excellent choice for daily wear. Rated 8 on the Mohs hardness scale, it resists scratching and chipping better than peridot or sardonyx, making it well-suited to rings and other jewelry worn regularly.

What zodiac sign is the August birthstone connected to?

August birthstones are associated with both Leo and Virgo, since the month spans these two zodiac signs. Many people pair peridot, sardonyx, or spinel with sign-specific stones found in guides like crystals for Leo or crystals for Virgo to combine birthstone and zodiac symbolism.