August is unusual because it has three recognized birthstones: peridot, spinel, and sardonyx. They look completely different, have different levels of durability, and suit very different jewelry styles.
Peridot is the familiar yellow-green choice, spinel offers the widest range of colors and better durability, while sardonyx stands out for its distinctive bands and ancient history. GIA identifies all three as August birthstones, with peridot and sardonyx measuring 6.5–7 on the Mohs scale and spinel measuring 8.
So which one should you choose?
Peridot is best for a classic August birthstone look, spinel is the strongest choice for everyday jewelry, and sardonyx is ideal if you prefer historical character and a bold, patterned appearance.
Peridot vs Spinel vs Sardonyx at a Glance
| Feature | Peridot | Spinel | Sardonyx |
|---|---|---|---|
| August birthstone | Yes | Yes | Yes |
| Typical color | Yellow-green to greenish yellow | Red, pink, blue, purple, violet and more | Brown, reddish-brown, orange, white or black bands |
| Mohs hardness | 6.5–7 | 8 | 6.5–7 |
| Best quality | Fresh, natural green color | Strong color and good clarity | Attractive, contrasting banding |
| Everyday ring use | Requires extra care | Excellent choice | Better with thoughtful setting and care |
| Style | Fresh and vibrant | Versatile and colorful | Vintage and distinctive |
| Best for | Classic August jewelry | Durable everyday jewelry | Carved, vintage or statement pieces |
The biggest practical difference is durability. Spinel is harder than both peridot and sardonyx, making it the most suitable of the three for frequent ring wear. Peridot and sardonyx can still be beautiful in rings, but they deserve more careful handling.
Why Does August Have Three Birthstones?
August has three birthstones because birthstone traditions have developed over time rather than coming from one single standardized list.
Peridot is the familiar modern August birthstone and is known for its green color. Sardonyx is the oldest of the three historically, with a tradition stretching back thousands of years. Spinel provides a more recent alternative with a much broader color range and greater hardness. GIA describes sardonyx as the original August birthstone and notes its history of more than 4,000 years.
This gives August-born shoppers three very different choices instead of being limited to one traditional gem.
If you want to explore the broader history and symbolism of birthstones, see this guide to birthstones by month.
Peridot: The Classic Green August Birthstone
Peridot is a gem variety of olivine and is recognized by its yellowish-green to greenish-yellow color. Unlike many gemstones that occur in several unrelated colors, peridot’s distinctive green appearance is part of its natural identity.
GIA notes that a pure grass-green color without obvious yellow or brown is generally preferred.
What does peridot symbolize?
Peridot has a long history of being associated with protection and was used as a talisman in ancient and medieval cultures. It is also the traditional gemstone associated with the 16th wedding anniversary.
For someone who wants an August birthstone that immediately looks like a birthstone, peridot is an easy choice.
Is peridot durable?
Peridot has a Mohs hardness of 6.5 to 7. That is respectable for a gemstone, but it is softer than spinel and many popular engagement-ring stones.
GIA specifically notes that peridot cannot take hard wear well and is not recommended for daily ring use. It should also be protected from thermal shock and cleaned gently rather than with steam or ultrasonic equipment.
That makes peridot especially appealing for:
- Pendants
- Earrings
- Occasional-wear rings
- Protected ring settings
- Birthstone jewelry where bright green color is the priority
You can also compare it with another green gemstone in the existing emerald vs peridot comparison.
Spinel: The Best Choice for Durability and Color Variety
Spinel is arguably the most versatile of August’s three birthstones.
While many people associate spinel with red, it can occur in a wide variety of colors, including pink, orange, purple, violet, blue and bluish green. Historically, red spinel was sometimes mistaken for ruby, including in famous royal jewelry.
What makes spinel different?
The biggest practical advantage is hardness.
Spinel measures 8 on the Mohs scale, compared with 6.5–7 for peridot and sardonyx. GIA describes it as typically durable for rings and other jewelry.
That makes spinel particularly attractive if you want an August birthstone that can handle frequent wear.
It also gives you much more freedom when choosing a color.
You can choose:
- Red spinel for a ruby-like appearance
- Pink spinel for a softer romantic look
- Blue spinel for a cooler alternative
- Purple or violet spinel for something unusual
- Orange or other warm colors for a distinctive statement
So if durability and color choice matter more than having the traditional green August look, spinel may be the strongest overall option.
Sardonyx: The Most Historical and Distinctive Choice
Sardonyx is completely different from both peridot and spinel.
Rather than being known primarily for transparent faceted color, sardonyx is recognized by its contrasting layers. It is a variety of chalcedony made from alternating layers of sard and onyx, creating bands that can range from reddish-brown and brown to dark orange with white or black layers.
Why choose sardonyx?
The appeal is its pattern and history.
Sardonyx was used for Roman seals and signet rings, and its contrasting layers made it especially useful for carving cameos and intaglios.
That makes it a particularly good choice for someone who likes:
- Vintage-inspired jewelry
- Signet rings
- Cameos
- Carved gemstones
- Earthy colors
- Strong visual patterns
- Historically inspired designs
Sardonyx is also 6.5–7 on the Mohs scale, so it requires more care than spinel. GIA notes that it is commonly dyed and recommends caution with high heat, steam and ultrasonic cleaning.
Peridot vs Spinel vs Sardonyx: Color Comparison
Color is probably the easiest way to separate the three.
Peridot is the most recognizable for its yellow-green to greenish-yellow appearance. It has a fresh, bright look that works especially well with warm metals.
Spinel has the widest color range. It can be red, pink, orange, purple, violet, blue and bluish green, giving you far more flexibility when matching a jewelry design.
Sardonyx is defined by its layered appearance. Instead of choosing the stone primarily for transparent brilliance, you’re choosing it for its contrasting bands and visual character.
So:
- Best classic green: Peridot
- Best color variety: Spinel
- Best natural pattern: Sardonyx
Which Is More Durable: Peridot, Spinel or Sardonyx?
Spinel is the most durable of the three based on Mohs hardness.
| Gemstone | Mohs hardness | Ring durability |
|---|---|---|
| Spinel | 8 | Best of the three |
| Peridot | 6.5-7 | Moderate; needs care |
| Sardonyx | 6.5-7 | Moderate; needs care |
Peridot and sardonyx have the same general Mohs hardness range, but their appearance and typical jewelry applications are quite different.
For a ring that will be worn every day, spinel is the obvious choice of the three. GIA specifically describes spinel as typically durable for rings, while cautioning that peridot is not recommended for daily ring use.
If durability is your priority, however, don’t judge a gemstone by hardness alone. The stone’s setting, design, exposure to impact and care routine also matter.
Which Is Best for an Everyday Ring?
If you want an August birthstone ring for frequent wear, spinel is the best option of these three.
Its Mohs hardness of 8 gives it a clear advantage over peridot and sardonyx. It also offers enough color variety that you don’t have to sacrifice personal style for durability.
Peridot can work in a ring if you’re willing to be more careful, particularly with a protective setting.
Sardonyx can also make a distinctive ring, especially in a signet or vintage-inspired design, but its appeal is more about its pattern and character than brilliant faceted sparkle.
Which Is Best for a Gift?
The best choice depends on the recipient.
Choose peridot if:
- They love green gemstones.
- You want a recognizable August birthstone.
- You prefer a bright, fresh appearance.
- The jewelry will not be exposed to heavy daily wear.
Choose spinel if:
- They want something durable.
- They prefer colorful gemstones.
- You want more options beyond green.
- The jewelry will be worn frequently.
Choose sardonyx if:
- They love vintage jewelry.
- They appreciate historical symbolism.
- They prefer earthy or neutral colors.
- They like unusual patterns rather than traditional faceted sparkle.
For someone specifically looking for an August birthstone ring, the August birthstone ring collection is a natural next step after comparing the three stones.
Peridot vs Spinel vs Sardonyx: Pros and Cons
Peridot
Pros
- Distinctive yellow-green color
- Classic August association
- Naturally colorful
- Long history in jewelry
Cons
- Softer than spinel
- Not ideal for hard daily wear
- Requires careful cleaning and handling
Spinel
Pros
- Hardest of the three
- Excellent choice for rings
- Available in many colors
- Historically interesting
- Can provide a ruby-like red appearance without being ruby
Cons
- Less immediately recognizable as the traditional green August stone
- Some colors are much less common than others
Sardonyx
Pros
- Ancient history
- Unique natural banding
- Excellent for vintage and carved designs
- Distinctive alternative to traditional faceted gems
Cons
- Less suitable for rough everyday wear than spinel
- Color can be enhanced through dyeing
- Its opaque or patterned appearance isn’t for everyone
For a broader introduction to gemstone varieties, you can also explore the complete gemstone guide.
Which August Birthstone Should You Choose?
There isn’t one universally best August birthstone. The right choice depends on what matters most to you.
Choose peridot if you want the classic August gemstone and love bright yellow-green color.
Choose spinel if you want the best combination of durability, color variety and everyday practicality.
Choose sardonyx if history, distinctive banding and vintage character are more important to you than traditional gemstone sparkle.
For most people choosing a ring that will be worn frequently, spinel has the strongest practical advantage because of its 8 Mohs hardness. For a symbolic August gift, however, peridot remains an excellent choice, while sardonyx offers something much more unusual and historically distinctive.
Ultimately, the best August birthstone is the one that matches the way you actually plan to wear and enjoy it.
Frequently Asked Questions
Is peridot better than spinel?
Not necessarily. Peridot is better if you specifically want the classic yellow-green August birthstone, while spinel is better for durability and color variety. Spinel’s Mohs hardness of 8 makes it better suited to frequent ring wear.
Is spinel more durable than peridot?
Yes. Spinel measures 8 on the Mohs scale, while peridot measures 6.5–7. Spinel is therefore the more durable choice for jewelry that receives regular wear.
Is sardonyx a real August birthstone?
Yes. GIA recognizes peridot, spinel and sardonyx as the three August birthstones and describes sardonyx as the original August birthstone.
Which August birthstone is best for an engagement ring?
Of these three, spinel is generally the most practical for an everyday engagement ring because it has a Mohs hardness of 8. Peridot and sardonyx can be used in rings but require more care.
What color is sardonyx?
Sardonyx typically has bands of brownish red, brown or dark orange alongside white or black layers. Its contrasting banding is one of its defining features.
Can you wear peridot every day?
Peridot can be worn in jewelry, but it is not ideal for a ring that receives heavy daily wear. GIA recommends caution because its 6.5-7 hardness makes it more vulnerable to damage than harder gemstones.
