Danburite
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
7.0
Specific Gravity
2.97 – 3.03
Refractive Index
1.627 – 1.639
Crystal System
Orthorhombic
Luster
Vitreous
Cleavage
Imperfect
Fracture
Uneven,Conchoidal
Color
various
Birefringence
0.006
Dispersion
0.017
Pleochroism
Weak: pale yellow - yellow
Mohs Hardness
Mohs Hardness: 7.0
1 Soft10 Hard
Crystal System
Value & Market
Price Tier
Moderate ($50-500/ct)
Where to Buy Danburite
Blue Nile
Fine jewelry retailer
James Allen
Gemstone jewelry
Brilliant Earth
Ethically sourced gems
Amazon
Wide selection
Links may earn a commission at no extra cost to you.
Treatments
A pink color has been noted to form on irradiation (C.L. Key, unpublished observation). One would expect this to bleach on being heated; fading in light is also a possibility - Nassau (1984)
7Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
2.97 to 3.03Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
ImperfectWalter Schumann, Gemstones of the world (2001) More from other references
Uneven,ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
1.627 to 1.639Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
Biaxial/+,-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
0.006Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
Weak: pale yellow - yellowHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
0.017Arthur Thomas, Gemstones (2009)
Yellow, yellow-brown, brown, pink, colourlessUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references
TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references
VitreousArthur Thomas, Gemstones (2009)
Weaker than LWHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Inert to bright blue or blue-greenHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
RedMichael O?Donoghue, Gems, Sixth Edition (2006)
OrthorhombicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
Prismatic with rhombohedral to square cross-sectionMichael O?Donoghue, Gems, Sixth Edition (2006) More from other references
Danburite occurs in granites and in metamorphosed carbonate rocks associated with hydrothermal activityMichael O?Donoghue, Gems, Sixth Edition (2006)
"Fingerprints", parallel growth tubes (may create chatoyancy) - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 4
Danburite information at mindat.org
Japan
Gemstones, Arthur Thomas, 2009, p.116
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 403
Madagascar
Mexico
Gemstones, Arthur Thomas, 2009, p.116
Myanmar
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
USA
About Danburite
Danburite is a calcium borosilicate mineral forming prismatic, diamond-shaped crystals in colorless, pale yellow, or delicate pink hues with excellent transparency and good hardness, making it an underrated gem for faceting. Named after Danbury, Connecticut, where it was first described, fine gem material comes from Mexico, Madagascar, Myanmar, and Japan. Its high luster, occasional cat's eye effect in fibrous varieties, and resemblance to topaz at far lower cost make it a rewarding collector gem.
Jewelry Use
Durability
7/10
Suitable for daily wear
Science FYI Family
Frequently Asked Questions
What is Danburite?
Danburite is a calcium borosilicate mineral forming prismatic, diamond-shaped crystals in colorless, pale yellow, or delicate pink hues with excellent transparency and good hardness, making it an underrated gem for faceting. Named after Danbury, Connecticut, where it was first described, fine gem ma
What is the hardness of Danburite?
Danburite has a Mohs hardness of 7.0, making it excellent for use in jewelry.
What color is Danburite?
Danburite is primarily Various.
How much does Danburite cost?
Danburite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Danburite?
Danburite belongs to the Orthorhombic crystal system.