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We compared the top blue gemstones for jewelry - Here are the best 9

Cabochon Gemstones
Top Blue Gemstones for Jewelry

Gemstones come in a variety of colors but, whether it is to match an outfit, your eyes, your skin tone, a fond memory or for spiritual meaning, sometimes it has to be blue. Which gemstone should you choose? We have come up with the 9 best blue gemstones - so you don't have to!

First let's establish our criteria for this particular list. We are selecting gemstones that are usually faceted, mostly translucent, definitely blue (no turquoise, purple or green), all one color and readily available. In addition the specimen should be hard and tough enough to resist scratching and chipping when placed into a jewelry setting.

Little doubt which stone will come out on top of our list but who will fill out the next 8 spots. Let's find out shall we?

No 1. Blue Sapphire

Blue Sapphires
Blue Sapphire

No prizes for guessing the world's top blue gemstone. We chose this iconic gem because the best examples have a matchless deep cornflower blue to a slightly violet blue. They have a dark tone but not so dark as to affect the brightness of the blue and the saturation is powerfully vivid and even throughout. Sapphires have an unsurpassed history, and age-old mythology and a connection with royalty meaning you cannot go wrong in choosing this gemstone.

No 2. Blue Topaz

Blue Topaz
Blue Topaz

Blue Topaz is almost an ideal gemstone, a great blue color, available in large sizes with very few flaws and is loved by everyone who sees one. The two favorite blue variations are the brightly colored 'Swiss Blue' and the much darker 'London Blue'. Blue topaz is very attractive, fairly inexpensive and available in a steady supply which makes it beloved by jewelry makers.

No 3. Blue Diamond

Blue Diamonds
Blue Diamond

Blue Diamonds can appear as natural untreated gemstones but are incredibly rare - the Hope Diamond, coming in at 45 carats is insured for $250 million - so should not really make our list but enhanced blue diamonds are natural diamonds that have been irradiated or exposed to high heat and pressure to turn a colorless precious stone into a vivid blue gem, still expensive but relatively affordable and simply beautiful. Along with outstanding beauty you get the prestige of owning a diamond.

No 4. Blue Zircon

Blue Zircon
Blue Zircon

Blue Zircon is a very underrated gemstone. It is underrated, because it is often wrongly confused with the man-made Cubic Zirconia. The blue zircons are usually heat treated, have a wonderful fire and brilliance, excellent clarity, come in lovely big sizes and reasonable prices compared others on this list.

No 5. Blue Aquamarine

Blue Aquamarine
Blue Aquamarine

Aquamarines have special pastel blue colors that are so like the ocean you are tempted to dive in! Their clarity, transparency and evenness of color are almost unsurpassed especially in the bigger sizes that are available in this unique gemstone.

No 6. Blue Tanzanite

Blue Tanzanite
Blue Tanzanite

Tanzanite is known as a blue gemstone but it is so much more than that. Its colors vary from light almost sky blue all the way up to a deep midnight blue. Add to this blue some flashes of red and touches of violet and purple and you can see why this gemstone really catches the eye. Tanzanite is basically always heat treated, very clear and can come in quite large carat sizes. With a tanzanite you are possessing a very special gemstone, very rare and found only in one small part of the earth.

No 7. Blue Tourmaline

Blue Tourmaline
Blue Tourmaline or Indicolite

Tourmaline comes in the widest array of colors in the gemstone world including a couple of outstanding blues. The blue ones are called "Indicolite Tourmaline". Indicolites have a color range from neon blue to dark blue and they usually come with excellent clarity. The color range is indeed very unique and almost exclusively found in this gemstone.

No 8. Blue Spinel

Blue Spinel
Blue Spinel

Spinels come in a variety of colors with the deep red version being the most expensive but the almost equally rare blue gemstones are very valuable and much sought after especially the transparent cobalt blue ones. Spinels are rarer than sapphires and any clean examples in this almost otherworldly blue are quickly snapped up.

No 9. Blue Iolite

Blue Iolite
Blue Iolite

Iolite is a deep blue gemstone sometimes veering towards violet, it is usually all natural as it cannot be heat treated and has three distinct colors when viewed at different angles. Gemstones good enough to be cut tend to be transparent with very few inclusions and anything over 5 carats is very rare.

Top 9 Blue Gemstone Hardness Chart

Gemstone Mohs Hardness Rating

Blue Diamond


Blue Sapphire


Blue Topaz


Blue Aquamarine


Blue Spinel


Blue Zircon


Blue Tourmaline


Blue Tanzanite


Blue Iolite


Top 9 Blue Gemstone Anniversary Chart

Gemstone Wedding Birthstone

Blue Sapphire

5th, 40th, 75th


Blue Topaz



Blue Diamond



Blue Zircon



Blue Aquamarine



Blue Tanzanite



Blue Tourmaline



Blue Spinel



Blue Iolite



So there we have the nine blue gemstones we consider the best of the best. We would like to give an honorable mention to a few that did not quite make the list. Apatite and Kyanite are gorgeous blue gemstones but are a bit too low on Mohs hardness scale to make perfect jewelry pieces.
See the our article on the Mohs hardness scale right here

Lapis Lazuli and Turquoise are two beautiful and quintessentially blue gemstones but they are both opaque stones and rarely if ever faceted. Color-change Fluorite is a lovely blue gemstone, but only in the daylight, take it indoors and, under incandescent light, it turns purple!

  • Première publication: 03 Décembre 2019
  • Dernière mise à jour: 27 Janvier 2020
  • © 2005-2021 tous droits réservés.
    Reproduction (texte ou graphique), sans le consentement écrit de (SETT Company Ltd) est strictement interdite.

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Taille et poids

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart