Updated as of June 2026
Grandidierite
A rare bluish green gem first found in Madagascar and named for explorer Alfred Grandidier. Its glowing teal color makes it a sought after collector stone.
Price range$500 to $4,000/ct
Hardness (Mohs)7.5
ColorsGreen, Bluish green, Teal
BirthstoneNone
AltGems Score How we score
6.6/10
Grandidierite pros and cons
Pros
- Excellent durability (Mohs 7.5) for everyday wear
- Rare and collectible
- Usually sold untreated
Cons
- Premium per-carat cost for fine quality
- Quality varies widely, so compare before buying
Grandidierite is durable enough for engagement rings and daily-wear jewelry of every kind.
Explore Grandidierite
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 bestGrandidierite jewelry
Grandidierite ringsGrandidierite engagement ringsGrandidierite necklacesGrandidierite pendantsGrandidierite earringsGrandidierite bracelets
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. Durable but can be cleaved. Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners and hard knocks.
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Blue · Mohs 5Where to buy Grandidierite: 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 Grandidierite?
A rare bluish green gem first found in Madagascar and named for explorer Alfred Grandidier. Its glowing teal color makes it a sought after collector stone. It rates 7.5 on the Mohs hardness scale and commonly appears in green, bluish green, teal.
How much does Grandidierite cost?
Grandidierite typically runs about $500 to $4,000 per carat depending on color, clarity, cut, and origin. See our Grandidierite price guide for detail.
Is Grandidierite 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 Grandidierite?
Grandidierite earns an overall AltGems Score of 6.6 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 Grandidierite?
Durable but can be cleaved. Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners and hard knocks.