Jade is not one stone but two — this is an introduction to the quieter of the pair, and to the differences you can actually see and feel.
One word, two minerals
For most of history, jade meant a single stone. Then, in 1863, the mineralogist Alexis Damour analyzed objects that had long been sold under that one name and found two unrelated minerals. He kept the old word, nephrite, for one and named the other jadeite. Everyday language never caught up — in English, jade still covers both.
Nephrite is an amphibole: a calcium magnesium iron silicate of the tremolite–actinolite series, written Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂. The balance of magnesium and iron sets its color, running from near-white toward deep green as iron increases. Jadeite is a pyroxene, a sodium aluminium silicate, NaAlSi₂O₆. Different chemistry, different mineral groups — the two share little beyond a name and a long history of being treasured.
Hard is not the same as tough
Hardness and toughness sound interchangeable; they are not. Hardness is resistance to scratching, toughness is resistance to breaking. On the Mohs scale nephrite sits around 6 to 6.5 and jadeite around 6.5 to 7 — neither harder than quartz, which is why no jade is scratch-proof. Toughness is a different contest entirely.
Under magnification, nephrite is a mat of microscopic fibers interlocked in every direction, like felt. A crack that starts in such a structure has nowhere to run: its force scatters among the fibers and dies out. That architecture makes nephrite one of the toughest natural stones known — long before it was jewelry, toolmakers shaped it into axe heads precisely because it would not shatter.
Jadeite is very tough as well, built from a tight mosaic of granular crystals — slightly harder than nephrite, slightly less tough. Neither ranking makes one stone better. They are different materials, and they answer to different tests.
The look and the feel
The most visible difference is the finish. Polished jadeite tends toward a bright, glassy surface. Nephrite takes a softer polish — an oily to resinous sheen that seems to come from inside the stone rather than sit on top of it. Where jadeite flashes, nephrite glows.
In the hand, jadeite is noticeably denser, with a specific gravity near 3.3 against nephrite's roughly 2.9 to 3.0, so a jadeite piece feels heavy for its size. Both are cool at first touch and slow to change temperature; a polished nephrite surface has a smoothness people often describe as waxy, almost warm.
None of this turns anyone into an expert. Colors overlap, finishes vary with the cutter, and imitations are made to fool exactly these impressions. Hand and eye can raise the question; they cannot settle it.
The species line
The dependable answer comes from a gemological laboratory. An identification report from GIA or a comparable lab states what a stone is — the species and variety lines together name the material — and whether any treatment was detected. For a buyer wondering which jade is in front of them, that one line outweighs every impression of luster and heft.
Worth knowing: an identification report identifies; it does not grade. There is no standardized quality scale for jade comparable to diamond grading. What the report offers is certainty about species and treatment — for jade, the certainty that matters. At JIE JIANG, a GIA identification report is available on request for higher-value pieces.
Why nephrite
JIE JIANG works only in natural nephrite jade, and the reasons are the ones above. Toughness is a daily-wear virtue: a bangle that meets a doorframe, earrings worn through a long week, a pendant that lives against the skin. Nephrite is built for that life.
Its luster fits the way we design — quiet surfaces, simple forms, nothing competing with the stone. Jadeite's brilliance is admired for good reason, and nothing here argues otherwise. We simply keep returning to the calmer of the two jades: warm to the eye, steady in daily wear, and made to be worn now and passed on in time.