Updated as of June 2026
Euclase
A rare collector gem prized for its delicate blue to sea green hues. Its name comes from Greek words for easy breaking, a nod to its cleavage.
Price range$100 to $600/ct
Hardness (Mohs)7.5
ColorsBlue, Green, Colorless
BirthstoneNone
AltGems Score How we score
7.0/10
Euclase pros and cons
Pros
- Excellent durability (Mohs 7.5) for everyday wear
- Exceptional brilliance and sparkle
- Usually sold untreated
Cons
- Can chip or cleave from a hard knock
- Quality varies widely, so compare before buying
Euclase is ideal for earrings, pendants, and occasional-wear rings, and works in everyday rings with a protective setting.
Explore Euclase
Meaning and properties
Symbolism, zodiac, chakraPrice and value
What it costs and whyBuying guide
How to choose and where to buyCare and cleaning
Keep it looking its bestEuclase jewelry
Euclase ringsEuclase engagement ringsEuclase necklacesEuclase pendantsEuclase earringsEuclase bracelets
Euclase by cut
Euclase ring styles
Euclase solitaire ringEuclase halo ringEuclase three stone ringEuclase hidden halo ringEuclase vintage and antique ringEuclase bezel ringAll styles
Euclase by metal
Euclase in yellow goldEuclase in white goldEuclase in rose goldEuclase in platinumEuclase in sterling silver
Common buying mistakes
- Buying on carat weight alone instead of color and cut, which drive beauty more.
- Skipping treatment disclosure, which changes both value and care.
- Overpaying at one retailer without comparing the same color and carat elsewhere.
- Cleaning it the wrong way. Has perfect cleavage and breaks easily. Clean gently with warm soapy water and a soft cloth. Avoid ultrasonic cleaners and any impact.
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Where to buy Euclase: for fine pieces, choose established jewelers with clear return policies and lab reports; for unique or budget pieces, vetted marketplace sellers work well. Always confirm treatment and the return window before buying. AltGems prices are general per-carat guides, so verify value with a certified gemologist or GIA report.
Frequently asked questions
What is Euclase?
A rare collector gem prized for its delicate blue to sea green hues. Its name comes from Greek words for easy breaking, a nod to its cleavage. It rates 7.5 on the Mohs hardness scale and commonly appears in blue, green, colorless.
How much does Euclase cost?
Euclase typically runs about $100 to $600 per carat depending on color, clarity, cut, and origin. See our Euclase price guide for detail.
Is Euclase good for everyday jewelry?
It rates 7.5 on the Mohs scale, so it suits earrings, pendants, and occasional-wear rings better than daily rough use.
What is the AltGems Score for Euclase?
Euclase earns an overall AltGems Score of 7.0 out of 10, balancing durability, brilliance, value, rarity, and everyday wearability. See our methodology on the How We Score page.
How do I care for Euclase?
Has perfect cleavage and breaks easily. Clean gently with warm soapy water and a soft cloth. Avoid ultrasonic cleaners and any impact.