Short answer: chrysoprase is not jade. It is chalcedony, microcrystalline quartz (SiO2) colored apple green by nickel, with a specific gravity of about 2.63 to 2.65 and a refractive index near 1.54. Jade is either jadeite (SG about 3.34, RI about 1.66) or nephrite (SG about 2.95, RI about 1.61), both tough rocks of interlocking crystals. Chrysoprase is noticeably lighter in the hand, looks glassy to waxy and evenly translucent, and fine jadeite costs far more.
How much lighter is chrysoprase, really?
Enough to notice once you know to look for it. Minerals.net gives chrysoprase a specific gravity of 2.63 to 2.65 (Minerals.net). GIA lists jade at 3.34 for jadeite and 2.95 for nephrite (GIA). Work it through for two beads of identical size: if the chrysoprase bead weighs 20 g, a jadeite bead of the same volume weighs about 25 g, and a nephrite bead about 22 g.
A jeweler's scale and a cup of water turn that hunch into a number. Weigh the stone in air, then suspended in water, and divide the air weight by the weight it loses. A result near 2.6 is quartz-family material; 2.9 to 3.0 is consistent with nephrite; 3.3 or above points to jadeite. Our specific gravity guide walks through the setup, and it works on beads and carvings that cannot be scratched or chipped.
The test has limits. Glued settings, metal findings and hollow carvings throw the reading off, and a very small stone gives a jumpy result on a kitchen-grade scale.
Property by property
| Property | Chrysoprase | Jadeite jade | Nephrite jade |
|---|---|---|---|
| Mineral | Chalcedony (quartz) | Pyroxene, NaAlSi2O6 | Amphibole, Ca2(Mg,Fe)5Si8O22(OH)2 |
| Structure | Microcrystalline quartz | Interlocking granular crystals | Interlocking fibers |
| Green caused by | Nickel | Chromium (in the finest green) | Iron |
| Mohs hardness | 7 | 6.5 to 7 | 6 to 6.5 |
| Specific gravity | 2.63 to 2.65 | 3.34 | 2.95 |
| Refractive index | 1.54 to 1.55 | 1.666 to 1.680 | 1.606 to 1.632 |
| Luster | Vitreous to waxy | Vitreous to greasy | Vitreous to greasy, sometimes dull |
| Main sources | Australia, Poland historically | Myanmar | Canada, China, Russia |
Hardness, density and RI come from Minerals.net and GIA; the jadeite color note follows the International Gem Society's description of chromium spectra in rich green jadeite (IGS, Jadeite). Two rows are decisive: specific gravity and refractive index. Hardness is useless here because all three sit close to 7.
What does the polish tell you under a loupe?
Turn the stone under a single lamp and look at the surface and the color.
- Chrysoprase takes a smooth, even polish with no grain, because its quartz crystals are too small to see. The color is usually soft and slightly uneven: Geology.com reports that pale yellowish green chrysoprase can contain 0.2 to 1.0 weight percent nickel oxide while deep green material can contain up to 5 percent (Geology.com, Chrysoprase), and that variation shows from bead to bead.
- Jadeite is a mass of tiny interlocking grains. GIA describes its texture as fine, medium or coarse depending on variations in crystal size and hardness (GIA, Jade Quality Factors). On coarser pieces a loupe shows a faint mottled or dimpled surface where grains of slightly different hardness polished unevenly. Color is often patchy, with green veins or spots in a paler body.
- Nephrite is made of dense, felted fibers. It polishes to a soft, oily glow and its color is usually even and darker, from spinach green to nearly black.
A strand of chrysoprase beads with perfectly identical color, clarity and translucency should make you suspicious, but of dye, not of jade. Geology.com points out that genuine chrysoprase usually shows some variation in color, saturation or diaphaneity.
What would a gemologist check?
- Refractometer. Chalcedony reads about 1.54 to 1.55. Jadeite gives a shadow edge near 1.66 and nephrite near 1.61. On a polished surface this settles the question in seconds.
- Spectroscope. IGS describes jadeite's absorption spectrum as showing a strong line at 437.5 nm, which is diagnostic, although rich deep green material may show a chromium spectrum instead. IGS also notes that green-dyed chalcedony shows weak lines near 645 and 670 nm (IGS, Chalcedony).
- Magnification. The lab looks for the granular texture of jadeite, the fibers of nephrite, or the featureless body of chalcedony, plus dye concentrated in cracks.
Why are they found in such different places?
They form in opposite settings. Chrysoprase is a near-surface product: Geology.com explains that it occurs at shallow depths where nickel-bearing rocks such as peridotite, dunite and serpentinite have been weathered, filling cavities, veins and fractures that are usually under a few inches wide. It is mined by the kilogram, not by the ton. Much early material came from the Szklary deposit in Poland, worked from the Middle Ages until 1980. Australia leads today, with the Marlborough Creek district of Queensland singled out for the best color, and IGS adds Western Australian localities at Yandramindra, Wingelina and Kalgoorlie.
Jade forms deep, in metamorphic rocks. GIA describes both jades as metamorphic rocks made of tiny interlocking mineral crystals, and notes that rough jadeite often takes the form of boulders, illustrating one from Myanmar that weighs 23 metric tons (GIA, Jade Description). Minerals.net lists Myanmar as the main jadeite deposit, with Guatemala, Russia, Kazakhstan, China and California as others (Minerals.net, Jade). For nephrite, IGS names Canada, China and Russia as the principal sources, including dark material from the Fraser River in British Columbia (IGS, Nephrite).
The size of the deposits shows up in the shop. Chrysoprase rough is limited by the width of its veins, so most pieces are small cabochons, beads and palm-sized polished specimens. Jade comes in blocks large enough for bowls and statues.
Which treatments should you ask about?
- Chrysoprase: the problem is not treated chrysoprase but other chalcedony dressed up as it. Minerals.net notes that white chalcedony can easily be dyed to look like chrysoprase, and Geology.com recommends calling such material "dyed green chalcedony".
- Jadeite: Geology.com describes Type B jadeite as bleached in hydrochloric or sulfuric acid and then impregnated under pressure with wax or a clear polymer resin (Geology.com, Jade). Untreated, wax-finished jadeite is sold as Type A. Ask for a lab report on anything expensive.
- Nephrite: IGS notes that its dense structure makes impregnating it with dyes and polymers far harder than with jadeite.
Which green stones are sold as "jade" but are neither?
Trade names cause much of the confusion. Minerals.net lists "Australian jade" and "Indian jade" as names for green quartz such as aventurine, "Jasper jade" for greenish jasper, and "Transvaal jade" for massive hydrogrossular garnet. Geology.com shows chrysoprase alongside maw sit sit, serpentine and hydrogrossular garnet as materials commonly confused with jade. Any name of the form "place + jade" deserves a second look. Our green crystal identification guide covers the wider field.
How do prices compare?
Fine jadeite is in a different league. IGS describes imperial jade, deep green jadeite from Myanmar, as very rare and expensive, commanding the highest prices on the market. Ordinary nephrite and pale jadeite are affordable. Chrysoprase sits in between: Geology.com calls it the second most valuable variety of chalcedony after gem silica, yet notes that it is rarely seen in commercial jewelry because stones of consistent color and calibrated sizes are hard to obtain in quantity. For a collector, a good polished chrysoprase costs a small fraction of jadeite with similar green.
Which should you buy?
- Buy chrysoprase for bright, translucent apple green at a reasonable price, especially as cabochons and small polished pieces. Keep it out of hot sun, since Geology.com notes prolonged sunlight and heat can fade some stones. The chrysoprase guide covers grades and look-alikes.
- Buy jade for carvings and bangles that must survive knocks, and buy jadeite only with disclosure of its type. The jade guide explains Type A, B and C.
- For identification practice, put a chrysoprase and a nephrite of the same size on a scale. The density gap is the lesson.
In crystal traditions both are green heart-associated stones, jade with good fortune in Chinese culture and chrysoprase with optimism. These are beliefs, not measurable properties.
Shopping chrysoprase and its look-alikes
We do not currently stock certified jadeite or nephrite, so the useful set for comparison is chrysoprase plus the other green stones most often mistaken for it or for jade. When buying chrysoprase, look for translucency when backlit, a natural apple green with gentle variation, and a seller who names the locality and says it is undyed.
- Polished chrysoprase specimens: sold in 10 to 19 g and 20 to 29 g bands, natural nickel-green pieces for the weight and loupe tests above.
- Polished Chrome Chalcedony, Mtorolite: Zimbabwean chalcedony colored by chromium, in 10 to 39 g bands; Geology.com describes it as a darker grayish green and nearly opaque compared with chrysoprase.
- Prehnite tumbles, spheres and Australian palm stones: another pale green stone often mistaken for both, offered as tumbles, 48.5 and 51.5 mm spheres and Australian palm stones of 1.75 to 2 inches.
- Green aventurine: the green quartz that Minerals.net says is sold as "Indian jade"; tumbles, palm stones and towers up to 10.5 inches show the glittery flakes that neither chrysoprase nor jade has.
Digital Towns Market
Chrysoprase and green look-alikes in stock
Frequently asked questions
Is chrysoprase a type of jade?
No. Chrysoprase is chalcedony, a microcrystalline form of quartz colored green by nickel. Jade is jadeite or nephrite, two different silicate minerals that form tough, interlocking masses. The resemblance is only in color and translucency; density, refractive index and origin are all different.
What is the quickest way to tell chrysoprase from jade at home?
Measure specific gravity with a scale and a cup of water. Chrysoprase comes out near 2.64, nephrite near 2.95 and jadeite near 3.34. The difference is large enough that a careful hydrostatic reading on a stone of a few grams separates them without scratching anything.
Is chrysoprase more valuable than jade?
It depends on the jade. Chrysoprase is worth more than ordinary pale nephrite but far less than fine jadeite. Imperial green jadeite from Myanmar commands the highest prices on the jade market, many times what similar-looking chrysoprase sells for.
Is "Australian jade" chrysoprase?
The name is a trade label, not a mineral name. Minerals.net lists "Australian jade" as a name used for green quartz such as aventurine. Because chrysoprase also comes mainly from Australia, ask the seller what the material actually is and expect a straight answer.
Can dyed chalcedony pass as both chrysoprase and jade?
Yes. Gray or white chalcedony dyed green can look like either. Signs of dye are perfectly uniform color across a whole strand, color concentrated in cracks, and an unnaturally vivid green. A spectroscope can show the absorption lines of the dye.
Sources
- Minerals.net, The gemstone chrysoprase: https://www.minerals.net/gemstone/chrysoprase_gemstone.aspx
- Minerals.net, The gemstone jade: https://www.minerals.net/gemstone/jade_gemstone.aspx
- GIA, Jade: https://www.gia.edu/jade
- GIA, Jade Description: https://www.gia.edu/jade-description
- GIA, Jade Quality Factors: https://www.gia.edu/jade-quality-factor
- Geology.com, Chrysoprase: https://geology.com/gemstones/chrysoprase/
- Geology.com, Jade: https://geology.com/gemstones/jade/
- International Gem Society, Jadeite Value, Price, and Jewelry Information: https://www.gemsociety.org/article/jade-jewelry-and-gemstone-information/
- International Gem Society, Nephrite Value, Price, and Jewelry Information: https://www.gemsociety.org/article/nephrite-jewelry-and-gemstone-information/
- International Gem Society, Chalcedony Value, Price, and Jewelry Information: https://www.gemsociety.org/article/chalcedony-jewelry-and-gemstone-information/