Blue Gemstones: Types, Shades, Durability, and How to Choose One to Wear
When you think about blue gemstones, the image of a blue sapphire probably comes to mind first. But blue sapphire is not the only blue gemstone.
There is a long list of blue gemstones, including aquamarine, blue topaz, tanzanite, blue spinel, and blue zircon. In a photograph, they may look like cousins, but on your hand, they behave very differently, and their prices can vary just as widely.
This guide brings the most important blue gemstones together in one place, covering their colors, durability, treatments, and what to consider when choosing one to wear.

|
Stone |
Typical shade |
Hardness (Mohs) |
Daily wear |
Price tier (relative) |
|
Sapphire |
Light blue to deep royal blue |
9 |
Yes |
Wide range, mid to premium |
|
Aquamarine |
Pale blue to greenish blue |
7.5–8 |
Yes |
Mid-range |
|
Blue topaz |
Sky blue to London blue |
8 |
Yes, mind hard knocks |
Accessible |
|
Tanzanite |
Violet-blue to deep blue |
6–7 |
With care |
Mid-range |
|
Blue spinel |
Greyish blue to cobalt |
8 |
Yes |
Mid-range |
|
Blue zircon |
Light blue to vivid blue |
6–7.5 |
With care |
Accessible |
|
Blue tourmaline (indicolite) |
Greenish blue to deep blue |
7–7.5 |
With care |
Mid-range |
|
Iolite |
Violet-blue, can flash gray-blue |
7–7.5 |
With care |
Accessible |
|
Kyanite |
Vivid blue |
4.5–7 (varies by direction) |
Occasional: pendants, earrings |
Accessible |
|
Apatite |
Bright blue to blue-green |
5 |
Occasional: earrings, pendants |
Accessible |
|
Sodalite |
Deep blue with white veining |
5.5–6 |
Occasional: earrings, pendants |
Accessible |
|
Turquoise |
Sky blue to greenish blue |
5–6 |
Occasional: pendants, cuffs |
Accessible to mid-range |
|
Lapis lazuli |
Deep blue with golden pyrite flecks |
About 5–5.5 |
Occasional: pendants, cabochon rings |
Accessible |
|
Larimar |
Soft sky blue marbled with white |
4.5–5 |
Occasional: pendants, protected settings |
Mid-range |
|
Azurite |
Rich, velvety deep blue |
3.5–4 |
Occasional: pendants, collector pieces |
Accessible |
Note: The hardness figures and wear ratings follow IDT Gemological Laboratories' blue gemstone guide. *Price tier is relative. It shows where a stone usually sits next to the others, not what a specific piece costs.
Blue Sapphire
Blue sapphire is the benchmark for blue gemstones. With a hardness of 9 on the Mohs scale and good toughness, it is one of the most durable choices for everyday jewelry and a classic partner for diamonds in engagement rings. Its blue color ranges from soft cornflower blue to deep royal blue.
Blue Spinel
Blue spinel is a durable alternative to sapphire. With a hardness of 8 on the Mohs scale and good toughness, it is well suited to rings and other jewelry worn regularly. Its color ranges from grayish blue to vivid cobalt blue, and it is rarely treated. Choose blue spinel if you love the look of sapphire but want something less commonly seen.
Blue Topaz
Blue topaz comes in three main shades: Sky Blue, the palest; Swiss Blue, a brighter electric blue; and London Blue, a deeper grayish steel blue that is generally the most expensive of the three. Almost all blue topaz is treated to achieve its color, which helps keep it relatively affordable.
Aquamarine
Aquamarine belongs to the beryl family and ranges from pale pastel blue to more saturated sky blue, often with a subtle cyan or green undertone. With a hardness of 7.5 to 8 on the Mohs scale, it is suitable for everyday wear with reasonable care. It is generally less expensive than blue sapphire, although large aquamarines with fine, saturated color can reach luxury prices. Aquamarine is also the March birthstone and is traditionally associated with Pisces.
Tanzanite
Tanzanite is found almost exclusively in Tanzania and is prized for its distinctive violet-blue color. Its color can appear less saturated in smaller stones, so smaller gems may look noticeably paler. Tanzanite also has perfect cleavage in one direction and is less tough than sapphire, making it more vulnerable to impact. Protective settings are therefore a good choice for tanzanite jewelry.
Blue Zircon
Blue zircon is known for its intense sparkle and high refractive index. Its vivid blue color can make it an appealing alternative to blue sapphire, often at a lower price. Natural zircon is a mineral in its own right and has no relation to laboratory-made cubic zirconia. Choose blue zircon when brilliance and fire matter more to you than maximum durability.
Tourmaline (Indicolite)
Blue tourmaline, often sold under the name indicolite, ranges from greenish blue to deep blue. With a hardness of 7 to 7.5 on the Mohs scale, it can handle regular wear with some care. It offers a middle ground between sapphire's greater durability and the softer blue gemstones found later in this list.
Iolite
Iolite is a violet-blue gemstone best known for its strong pleochroism. Depending on the viewing angle, it can appear violet, blue, or grayish blue. This shifting color gives iolite a distinctive character that sets it apart from more consistently colored blue gemstones.
Kyanite
Kyanite is known for its vivid blue color and an unusual feature: its hardness varies depending on the direction in which it is measured, ranging from about 4.5 to 7 on the Mohs scale. Because of this directional variation and its cleavage, kyanite is better suited to pendants and earrings than to rings exposed to frequent impact. Its color can range from medium blue to deep, inky blue.
Apatite
Apatite ranges from bright blue to blue-green, often occupying the aqua and teal end of the color spectrum. With a hardness of about 5 on the Mohs scale, it is relatively soft and can scratch more easily than harder gemstones. Earrings and pendants are generally better choices than rings because they are less likely to encounter hard surfaces and everyday impacts.
Lapis Lazuli
Lapis lazuli is recognized for its deep blue color, often accented with golden flecks of pyrite. These pyrite inclusions can help distinguish lapis from stones such as sodalite and turquoise. With a hardness of about 5 to 5.5 on the Mohs scale, lapis is better suited to pendants and protected cabochon rings than to jewelry exposed to heavy daily wear.
Turquoise
Turquoise ranges from sky blue to greenish blue, with some stones leaning strongly toward blue-green. Its color and characteristic matrix patterns help distinguish it from lapis lazuli and sodalite. With a hardness of about 5 to 6 on the Mohs scale, turquoise is better suited to pendants, cuffs, and carefully worn rings than to high-impact everyday jewelry. If a turquoise piece seems unusually inexpensive, ask whether it has been dyed or made from treated or reconstructed material.
Larimar
Larimar is a soft sky-blue gemstone marked by distinctive white marbling. It is a rare variety of blue pectolite found only in the Dominican Republic. With a hardness of about 4.5 to 5 on the Mohs scale, it is relatively delicate and can scratch or chip easily. Pendants and protected settings are generally safer choices than rings for everyday wear.
Sodalite
Sodalite is a deep blue gemstone often marked by contrasting white veining, which helps distinguish it from lapis lazuli. With a hardness of about 5.5 to 6 on the Mohs scale, it is relatively soft, and its cleavage can make it vulnerable to breaking under impact. For that reason, sodalite is better suited to earrings and pendants than to rings exposed to frequent knocks.
Azurite
Azurite is known for its rich, velvety deep-blue color. With a hardness of only 3.5 to 4 on the Mohs scale, it is one of the softest gemstones in this group and can scratch or damage easily. Faceted azurite is extremely uncommon, so it is more often seen as a polished stone or collector's specimen. If used in jewelry, a pendant or another protected setting is the safer choice.

Every "rare blue gems" list includes these. Two things to know before you fall for one: most are sold as collector stones, and if one gets damaged, you may not be able to replace it.
|
Stone |
What sets it apart |
Wear and care |
|---|---|---|
|
Blue diamond |
Blue from boron; among the rarest and most valuable gemstones in the world |
Treated blue diamonds exist, so ask for an independent lab report |
|
Blue garnet |
A color-change garnet from Bekily, Madagascar: blue-green in daylight, purple under incandescent light |
Exceptionally rare, and a collector's stone |
|
Benitoite |
A vibrant blue with diamond-like brilliance, found primarily in California |
Collector's stone rather than an everyday ring |
|
Euclase |
Icy blue, with strongly colored stones scarce above a few carats |
Perfect cleavage in one direction; avoid mechanical cleaning systems |
|
Jeremejevite |
Sky-blue to slightly violet-blue; most clean stones are under 2 carats |
Hardly ever seen in the trade, and nearly impossible to replace if damaged |
|
Linarite |
An electric, intense blue |
Soft, brittle, and contains lead: strictly a collector's mineral |
|
Scorodite |
Blue-green that can shift to bluish purple under incandescent light |
Soft and contains arsenic: jewelry use isn't recommended |
|
Labradorite |
A gray base with flashes of blue, known as labradorescence (6–6.5 on the Mohs scale) |
Pendants and earrings |
|
Blue opal |
Gentle, dreamy blue patterns (about 5.5–6.5 on the Mohs scale) |
Pendants and earrings; Ethiopian opal can be porous, while Australian and Peruvian opals are often more stable |
|
Blue chalcedony |
Milky pale blue to sky blue, with a waxy to dull luster instead of sparkle |
Hard and tough with a great polish, so it wears better than it looks |
Blue Diamond
Its blue color comes from the presence of boron, and blue diamonds are among the rarest and most valuable gemstones in the world. Both natural and treated blue diamonds exist, making an independent laboratory report especially important when purchasing one.
Blue Garnet
This is a rare color-change garnet from Bekily, Madagascar. It shifts from blue-green in daylight to purple under incandescent light. These were the first commercially available gemstones marketed as “blue” garnets, and genuinely blue color-change garnets remain exceptionally rare.
Benitoite
A rare blue gemstone found primarily in California, benitoite is known for its vivid blue color and diamond-like brilliance. Because of its rarity, it is considered more of a collector’s gemstone than a practical choice for everyday jewelry.
Euclase
An icy blue gemstone with a significant drawback: it has perfect cleavage in one direction. Although it is reasonably hard, strongly colored euclase is scarce in larger sizes, particularly above a few carats. Colorless euclase can also be turned blue through radiation treatment. Because of its fragility, mechanical cleaning systems should be avoided, and euclase is generally regarded as a collector’s gemstone.
Jeremejevite
This gemstone ranges from sky blue to slightly violet-blue. Most clean specimens weigh less than 2 carats, while stones above 5 carats are exceptionally uncommon. Jeremejevite is extremely rare, seldom encountered in the trade, and difficult to replace if damaged.
Linarite
Known for its intense, electric-blue color, linarite is soft and brittle and contains lead. These properties make it unsuitable for jewelry and strictly a collector’s mineral.
Scorodite
Scorodite can display a blue-green color that shifts toward bluish purple under incandescent light. However, it is soft, brittle, and contains arsenic, making it unsuitable for jewelry. It is best appreciated as a mineral specimen for display or collection.
Bonus Pick: Blue Chalcedony
Blue chalcedony is quartz in a fine-grained form, in shades from milky pale blue to sky blue. Its durability surprises people: it's hard, tough, and takes a great polish, so it handles wear better than its soft look suggests. Just don't expect sparkle. It's translucent to opaque with a waxy to dull luster, which makes it the pick for a calm, matte-looking blue.
Three Names That Show Up on Blue Lists but Need a Second Look
Three stones often appear on blue lists but are not blue anymore.
-
Kunzite is the pink to violet variety of spodumene, not a blue stone. Any bluish hint is a faint cast at best, so don't shop for it as a blue gem.
-
Howlite is naturally white with grey veining and often dyed blue to mimic turquoise at a lower price. If a "turquoise" piece is suspiciously cheap, ask whether it's dyed howlite.
-
Blue aventurine sold in markets is usually something else. It's typically Murano-style aventurine glass, not a natural stone, and blue goldstone is made by substituting cobalt for copper. It's a lovely craft material. It should just be called what it is.
How to Choose a Blue Gemstone for Your Situation
There's a best blue gemstone for you, and it comes from four decisions in order:
-
How will you wear it? Daily, occasionally, or in a piece that stays away from impact.
-
Which shade do you actually want? Use the shade bands above to narrow the field.
-
What's your budget, and what treatment are you comfortable with? Decide this before falling for a specific stone.
-
What setting protects it? Softer stones need more help from the setting.
Here's how those decisions play out in real situations:
For an everyday ring (engagement or wedding)
Start with sapphire. Blue spinel is a good alternative if you want a similar appearance at a different price point or prefer a less common gemstone. For a pale, cool blue, consider aquamarine.
For the sapphire look on a smaller budget
Consider blue spinel, blue topaz, or blue zircon. Blue topaz offers the most size for the money, while London blue topaz comes closest to sapphire’s rich color.
For a statement color
Choose tanzanite for dramatic violet-blue tones or London blue topaz for a deep, moody blue. Both are better suited to pendants, earrings, or rings with protective settings.
For a gift or birthstone
Match the gemstone to the recipient’s birth month. The birthstone section below provides the relevant options.
For a keepsake worn occasionally
Consider turquoise, lapis lazuli, larimar, sodalite, labradorite, or kyanite. These gemstones are well suited to special-occasion jewelry but are generally less suitable for everyday wear.
For something rare and custom
Consider blue garnet, benitoite, euclase, or jeremejevite. Because these gemstones can be exceptionally rare and difficult to replace, it is best to work with a jeweler experienced in handling unusual and fragile stones.
Blue Gemstone Birthstones, Anniversaries, and Meanings
If you're shopping for a gift, this is the quick lookup:
|
Month |
Blue stone |
|
March |
Aquamarine |
|
September |
Sapphire |
|
Turquoise, zircon, tanzanite, and on many lists blue topaz |
December has multiple blue birthstones. If someone's birthday is in December, you can't really go wrong with any of them, and your choice can follow the durability and budget decisions above. Anniversaries have blue options too. Sapphire is suggested for a fifth anniversary, and blue topaz is the gem of the 4th. As for meaning, blue is broadly linked with calm, trust, and loyalty.
