What Is the Rarest Birthstone? Top 10 Rarest Birthstones Ranked

What Is the Rarest Birthstone? Top 10 Rarest Birthstones Ranked

Natural alexandrite is one of the rarest birthstones. It looks green in daylight but turns red under warm light. Russian mines have run out. so finding a natural one-carat stone is difficult. Natural pearls and black opals are also rare.

Rarest Birthstone Can Mean Two Very Different Things

February has fewer births in the US than any other month, making amethyst the rarest birthstone by birth count. August sees more births, so peridot is more common.

But here's the twist. Amethyst is actually one of the most common and affordable gemstones. So February has fewer people sharing the birthstone, but the gem itself is easy to find.

How We Ranked the Rarest Birthstones?

There is no official ranking of the rarest birthstones. Rarity depends on three things:

●   Species rarity: How rare the gemstone is. Alexandrite and tanzanite are good examples.

●       Quality rarity: How hard it is to find a beautiful stone. Fine diamonds and rubies are much harder to find than average ones.

●       Size rarity: How hard it is to find a large, high-quality stone. Most natural alexandrites weigh less than one carat, while larger stones are much harder to find.

For this list, we ranked the rarest natural, jewelry-quality versions of each birthstone. We considered where they are found, how much high-quality material is available, and how difficult it is to find them in larger sizes.

Add a clear ranking methodologyClarify the scope of each birthstone

The Rarest Birthstones at a Glance

These are approximate prices for fine natural gemstones. Actual prices depend on size, origin, treatment, and certification. Lower-quality stones cost less, while lab-grown versions are much cheaper.

The Top 10 Rarest Birthstones, Explained

1. Alexandrite (June): The Rarest Birthstone

Alexandrite is a rare variety of chrysoberyl famous for changing color depending on the light. It appears green in daylight and red or purple-red under warm lighting, earning it the nickname "emerald by day, ruby by night."

Discovered in Russia's Ural Mountains in the 1830s, it was named after Alexander II. Those original mines are now largely depleted, and natural alexandrite is found in smaller quantities in places such as Sri Lanka, Brazil, India, and East Africa.

Its rarity comes from the unusual conditions needed for beryllium and chromium to occur together during formation.

Many stones sold online as alexandrite are lab-grown or imitations. Lab-grown alexandrite is genuine alexandrite, while imitations use different materials.

Wearability: Excellent. With a Mohs hardness of 8.5, alexandrite is durable enough for everyday rings.

2. Natural Pearl (June)

Natural pearls form without human intervention and are extremely rare. Only a small percentage of wild oysters produce pearls, and fewer still produce round, lustrous examples suitable for fine jewelry.

The Persian Gulf was once famous for its natural pearl beds, but heavy harvesting greatly reduced supplies. Today, natural pearls are more commonly found in antique jewelry collections and auctions than in regular stores.

Most pearls sold today are cultured pearls. They are genuine pearls, but humans help initiate their formation, making natural pearls much rarer.

Wearability: Delicate. Perfume, sweat, and acids can damage pearls, so pendants and earrings are often better for regular use than everyday rings.

3. Black Opal (October)

Black opal displays flashes of rainbow colors against a dark background, making its colors appear especially vivid. It is much rarer than white opal, and most fine black opals come from Lightning Ridge in Australia.

Because opal contains water, exposure to heat, sudden temperature changes, and very dry conditions can damage it.

Watch for: Doublets and triplets, which combine thin opal layers with other materials. These can be attractive options when sold honestly, but they are not solid black opal.

Wearability: Moderate to low. Opal works well in pendants and earrings, but everyday wear, especially in rings, can increase the risk of damage.

4. Tanzanite (December)

Tanzanite is found commercially in only one known location: the Merelani Hills near Mount Kilimanjaro in Tanzania. No other major commercial deposits have been discovered despite years of exploration.

Discovered in 1967 and popularized by Tiffany & Co., tanzanite became an official December birthstone in 2002. Its addition shows that birthstone lists can evolve over time.

Tanzanite is still mined in significant quantities, but its supply remains uncertain because it comes from a single location. Large stones with deep blue-violet color are particularly difficult to find.

Most tanzanite is heat-treated to enhance its color. This is a common treatment and does not make the gemstone fake.

Wearability: Handle with care. Its Mohs hardness of 6–7 and tendency to crack under hard impacts make earrings and pendants safer choices than everyday rings.

5. Paraíba Tourmaline (October)

Tourmaline comes in many colors, but Paraíba tourmaline is especially rare and valuable. Discovered in Brazil in the late 1980s, it is famous for its vivid neon blue-green color, caused by copper.

The original Brazilian mines produced limited quantities. Similar tourmalines were later discovered in Mozambique and Nigeria, although Brazilian stones generally command the highest prices.

Wearability: Good. With a Mohs hardness of 7–7.5, Paraíba tourmaline is suitable for many types of jewelry with reasonable care.

6. Unheated Fine Ruby (July)

Ruby is a variety of corundum, which is not particularly rare. fine bright-red rubies, especially those with the prized "pigeon's blood" color associated with Myanmar, are much harder to find.

Most rubies undergo heat treatment to improve their color or clarity. Untreated rubies verified by a reputable gem laboratory are especially valuable.

Be cautious with inexpensive rubies, as some low-quality stones are filled with lead glass to improve their appearance. These require extra care, and unusually cheap, large, bright-red rubies deserve closer inspection.

Wearability: Excellent. Ruby has a Mohs hardness of 9, making it one of the hardest birthstones after diamond.

7. Padparadscha Sapphire (September)

Blue sapphires are widely available, but Padparadscha sapphires are much rarer. Their distinctive pink-orange color resembles a sunset, and their name comes from a Sinhalese word associated with the lotus flower.

Sri Lanka is the best-known source. Because the accepted color range is so specific, even gem experts sometimes disagree about which stones qualify as Padparadscha sapphires.

Wearability: Excellent. With a Mohs hardness of 9, this sapphire variety is suitable for everyday jewelry.

8. Demantoid Garnet (January)

Most garnets are familiar red gemstones, but demantoid is a rare green variety first discovered in Russia's Ural Mountains. It is prized for its exceptional brilliance and colorful flashes of light.

Some Russian demantoids contain golden, hair-like inclusions called "horsetails," which collectors particularly value. Fine stones weighing more than one carat are difficult to find.

Wearability: Fair. With a Mohs hardness of 6.5–7, demantoid is best used in protective settings, especially for rings.

9. Fine Emerald (May)

Most emeralds contain natural inclusions known as jardin, the French word for "garden." Many are treated with oil or resin to improve their apparent clarity.

Fine emeralds with vivid green color, few inclusions, and minimal treatment are rare, especially those weighing more than two carats. Colombia is the best-known source, although Zambia and Brazil also produce high-quality emeralds.

Wearability: Moderate. Emerald has a Mohs hardness of 7.5–8, but its inclusions can make it vulnerable to breaking. Protective settings are recommended for rings.

10. Fine Red Spinel (August)

Spinel is an underrated gemstone that was historically mistaken for ruby. Some famous rubies in royal collections were later identified as spinel. It became an official August birthstone in 2016.

Fine red and cobalt-blue spinels are rare, and many are naturally untreated. With a Mohs hardness of 8, spinel is also durable enough for regular wear.

It is an excellent option for anyone seeking a distinctive gemstone that combines rarity with everyday practicality.

Birthstones That Are Only Rare at the Top End

Some birthstones are widely available, but their finest varieties remain rare.

●       Diamond (April): Diamonds occur in many parts of the world, but exceptional colorless diamonds and natural pink or red diamonds are rare. The closure of Australia's Argyle mine in 2020 also reduced a major source of pink diamonds.

●       Imperial topaz (November): This rare variety has rich golden-orange to pinkish colors and comes mainly from Brazil. Blue topaz is much more affordable.

●       Natural citrine (November): Much of the citrine sold today is heat-treated amethyst. Natural, untreated citrine is harder to find.

●       Aquamarine (March): Pale aquamarine is relatively common, while deeper blue stones are rarer and generally more expensive.

Rarer Than Any Birthstone

Some of the world's rarest gemstones are not official birthstones.

●       Red beryl: An extremely rare gemstone found mainly in Utah, USA. It is much rarer than diamond but is not an official birthstone.

●       Taaffeite: First identified in 1945, this gemstone was initially mistaken for spinel. Some websites list it as an October alternative, but it does not appear on recognized birthstone lists.

●       Red diamond: The rarest natural diamond color, with only a handful of examples known. These diamonds typically appear at specialist auctions rather than regular jewelry stores and are not official birthstones.

Which Month Has the Rarest Birthstone?

June. It has alexandrite, the rarest birthstone overall, plus natural pearl as a strong runner-up. June's third birthstone, moonstone, is much easier to find.

Here's how every month stacks up, using the modern US birthstone list.

The Catch Nobody Mentions: Rarer Stones Get Faked More

Birthstones are always in demand, especially around birthdays. When a gemstone is rare, some sellers offer alternatives under similar names. Always check the label before buying.

Here are the main options you may find:

1. Natural stone with a lab report: Confirms the gemstone's identity and provides details about its characteristics.

2. Lower-quality natural stone: A genuine gemstone that may be smaller or less attractive but is honestly described.

3. Lab-created stone: Made from the same mineral as the natural gemstone, usually at a lower price.

4. Simulant: A different material designed to look like the real gemstone.

5. Unclear labeling: A warning sign that the seller may not be explaining exactly what you're buying.

The Two-Light Test for Alexandrite

A common alexandrite imitation is color-changing synthetic sapphire. It also changes color, but its color shift can differ from genuine alexandrite.

1. View the stone in daylight or cool white light (5,000K or higher).

2. Then examine it under warm light (around 2,700K).

3. Green to red or purplish-red: Consistent with alexandrite's characteristic color change.

4. Grayish-blue to dull purple: May indicate a synthetic sapphire imitation.

This test cannot reliably distinguish natural alexandrite from lab-grown alexandrite, as both have the same mineral composition and can display similar color changes. A report from a reputable gemological laboratory, such as GIA, can help establish the stone's identity and whether it is natural or laboratory-grown.

What US Law Says About Labeling

The US Federal Trade Commission's jewelry guidelines, under 16 CFR Part 23, cover gemstone descriptions and treatments. Buyers should know the following:

●       Lab-grown and imitation stones: Sellers should clearly identify them as lab-created, lab-grown, simulated, or imitation, as applicable.

●       "Faux" isn't enough: This term may not clearly explain whether a stone is natural, laboratory-grown, or an imitation.

●       Lab-created alexandrite: It must be genuine alexandrite grown in a laboratory, not a different gemstone that imitates its color change.

●       Cultured pearls: These should be clearly identified as cultured pearls.

●       Treatments: Relevant gemstone treatments should be disclosed, particularly when they affect value or care.

If a seller uses confusing phrases such as "genuine lab alexandrite" or hides the word "simulated" in fine print, check the listing carefully before buying.

How to Buy a Rare Birthstone Without Regretting It

Your best choice depends on your budget and whether rarity, price, or appearance matters most.

Option 1: Buy a certified natural stone. This is best if natural rarity is your priority. Consider a smaller gemstone and request a report from a reputable laboratory, such as GIA or Gübelin. A fine natural alexandrite under one carat may be more accessible than a larger stone, although prices vary considerably.

Option 2: Choose a lab-grown stone. Lab-grown alexandrite has the same mineral composition as natural alexandrite and can display the same color-changing effect. It is generally more affordable and works well for everyday jewelry and gifts.

Option 3: Choose the color you love. If personal meaning matters more than rarity, choose a beautiful gemstone that is clearly labeled.

Whichever option you choose, don't assume birthstones are investments. Colored gemstones can be difficult to resell, and resale prices may be much lower than retail prices. Buy a stone because you enjoy it.

Can You Set Rare Birthstones in Sterling Silver?

Sterling silver is a popular, affordable choice for birthstone jewelry. It contains 92.5% pure silver and pairs beautifully with tanzanite, aquamarine, blue topaz, and alexandrite.

Here are a few things to consider:

●       Lab-grown stones, cultured pearls, and many natural birthstones: Sterling silver can work well. Choose a setting that holds the gemstone securely.

●       Expensive natural stones: Certified alexandrite and Paraíba tourmaline may warrant gold or platinum settings, depending on the design and how often you plan to wear them.

●       Soft or fragile stones: Opal, pearl, and tanzanite are often better suited to pendants and earrings than everyday rings. Protective settings can reduce the risk of damage.

How to Care for Rare Birthstone Jewelry

●       Put jewelry on last and remove it first. Perfume, lotion, and hairspray can dull or damage some gemstones.

●       Remove jewelry before workouts, swimming, cleaning, or gardening. Chlorine and household chemicals can damage silver and delicate stones.

●       Store pieces separately. Hard gemstones such as sapphire can scratch softer stones like opal and tanzanite.

●       Clean gently. Use warm water, mild soap, and a soft brush only for stones that can safely tolerate this method. Wipe pearls and opals with a soft, damp cloth.

●       Avoid ultrasonic cleaners for emerald, opal, pearl, and tanzanite, as vibrations can damage some stones or treated gemstones.

●       Prevent silver tarnish. Store sterling silver in an anti-tarnish pouch and polish it gently with a silver cloth. Keep polishing products away from porous gemstones.

Frequently Asked Questions

What is the rarest birthstone?

Natural alexandrite is widely considered one of the rarest birthstones. Its distinctive color change results from its unusual chemical composition. The original Russian mines are largely depleted, and fine stones over one carat can be difficult to find.

What are the three rarest birthstones?

Natural alexandrite (June), natural pearl (June), and black opal (October) are strong contenders. Tanzanite (December) is another rare choice because its known commercial source is limited to one area of Tanzania.

What is the second-rarest birthstone?

Natural pearl is a strong contender because naturally formed pearls are exceptionally uncommon. Among mined gemstones, black opal and tanzanite are also considered rare.

Which month has the rarest birthstone?

June is a strong candidate because it includes alexandrite and natural pearls, both of which can be exceptionally rare in fine quality.

What is the rarest birthstone by birthday?

If you mean the birthstone shared by the fewest people, amethyst is sometimes suggested because February has relatively few births in the United States. birthstone rarity by birth month depends on the population and the data used. Amethyst itself is not a rare gemstone.

What is the most common birthstone?

Amethyst is widely available and relatively affordable. Peridot is also accessible, although the number of people sharing a birthstone depends on how births are distributed across months.

Is tanzanite rarer than alexandrite?

Fine natural alexandrite is generally harder to find, particularly in larger sizes. Tanzanite also has a limited geographic source, but it continues to be mined in significant quantities.

Is tanzanite rarer than diamond?

Tanzanite has a much more limited geographic source, as its known commercial deposits are concentrated in a small area of Tanzania. Diamonds are mined in several countries, although exceptional diamonds can also be extremely rare.

Is lab-created alexandrite real alexandrite?

Yes. Genuine lab-grown alexandrite has the same mineral composition as natural alexandrite and can display the same color-changing effect. Some cheaper imitations use color-changing synthetic sapphire or other materials instead.

What is the rarest gemstone in the world?

There is no single agreed-upon answer, but red beryl, taaffeite, painite, and natural red diamonds are among the gemstones known for their exceptional rarity.

Is a rare birthstone a good investment?

Usually not for the average buyer. Colored gemstones can be difficult to resell, and resale prices may be well below retail prices. Choose a gemstone for its beauty and personal meaning rather than expecting investment returns.

Can I wear a rare birthstone every day?

It depends on the gemstone. Alexandrite, ruby, sapphire, and spinel are generally suitable for regular wear with proper care. Opal, pearl, and tanzanite are more vulnerable to damage and may be better suited to pendants and earrings.

The Bottom Line

Natural alexandrite is widely regarded as one of the rarest birthstones, making June a notable month for rare gemstones. February may be considered the rarest month in terms of birth numbers in some populations, but that is different from gemstone rarity.

The key is knowing what you're paying for. Check the gemstone's description and request a laboratory report when buying an expensive stone. Lab-grown and imitation stones can also be attractive choices when clearly labeled.

A birthstone's value often comes from what it means to you, not simply how rare it is.