Sard

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Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 6.5 – 7.0

Specific Gravity 2.58 – 2.63

Refractive Index 1.535 – 1.539

Crystal System Trigonal

Luster Waxy,Resinous

Cleavage None

Fracture Conchoidal

Color various

Birefringence 0.008

Pleochroism Absent

Mohs Hardness

Mohs Hardness: 6.5 – 7.0

1 Soft10 Hard

Crystal System

Value & Market

Price Tier Moderate ($50-500/ct)

Where to Buy Sard

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

The color may be lightened by heat-treatment - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7 6.5 to 7Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) 2.58 to 2.63Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) NoneWalter Schumann, Gemstones of the world (2001) ConchoidalArthur Thomas, Gemstones (2009) 1.535 to 1.539Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Uniaxial/+Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) 0.008 to 0.010Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) AbsentWalter Schumann, Gemstones of the world (2001) NoneWalter Schumann, Gemstones of the world (2001) BrownUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Waxy,ResinousArthur Thomas, Gemstones (2009) TrigonalUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Fibrous to grained aggregateUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Sard information at mindat.org

About Sard

Sard is a brownish-red to reddish-orange variety of chalcedony (microcrystalline quartz), whose warm earthy color is produced by iron oxide impurities in concentrations slightly different from those producing carnelian. Used extensively in ancient Greece and Rome for intaglio seals and carved cameos, it was considered one of the most important engraving stones of the ancient world. Fine sard comes from India, Brazil, and Uruguay, where it occurs in volcanic rock cavities.