Black Jade

Why black jade is nephrite, almost always

Jadeite does occur in very dark tones, but the overwhelming majority of material sold as black jade is nephrite. The reason is availability. Nephrite forms in serpentinised ultramafic rock, which is common, and iron-rich or graphite-bearing pockets within it are not unusual. Jadeite forms under much rarer high-pressure conditions, and what little dark jadeite exists tends to be sold as jadeite rather than under the generic jade label.

What makes it black

Two mechanisms, often together. Fine graphite dispersed through the felted amphibole gives a true neutral black. High iron content in the actinolite end of the series pushes the green so dark it reads black under normal light. Pieces coloured mostly by iron reveal deep forest green at thin edges and under strong transmitted light; pieces coloured by graphite stay closer to neutral. Neither is better, and both are entirely natural.

Toughness versus hardness

These get confused constantly. Hardness is resistance to scratching, and nephrite at 6 to 6.5 is beaten by quartz at 7, meaning ordinary dust can dull an unprotected polish over years. Toughness is resistance to breaking, and here nephrite is close to unmatched among natural stones. The interlocking fibrous texture means a crack has no clean plane to travel along. This is why neolithic cultures across Asia, Europe and the Pacific chose nephrite for axes and adzes long before they had metal.

The substitution problem

Black jade sits in an awkward commercial position: desirable enough to imitate, cheap enough that nobody bothers to certify it. Dyed serpentine is the most common substitute, followed by black onyx, which is itself usually dyed chalcedony. Obsidian gets sold as black jade with some regularity, and is easy to separate once you know that it fractures like glass because it is glass. Reconstituted or resin-bonded powder appears at the very bottom of the market.

Testing it yourself

You can get a long way with no equipment. Heft it: nephrite feels dense for its size. Touch it: it draws heat from your hand and warms slowly. Light it: a strong torch at a thin edge usually shows green in nephrite, flat black in onyx, and dye concentrated in fractures in treated serpentine. Tap it gently against a hard surface: nephrite gives a clear ring that softer substitutes do not. None of these is conclusive alone, but together they are reliable.

Working and finishing

Nephrite polishes to a waxy, slightly soft-looking lustre rather than the glassy shine of quartz, and that difference is a useful authenticity cue in itself. It takes a very high polish precisely because the fibrous structure leaves no cleavage planes to pluck out under the wheel. Our spheres are hand-cut and hand-polished, which is slower than machine work and shows in the evenness of the curve.

Living with it

Black jade is a genuinely practical stone to own. It survives pockets, desks, and daily handling. The realistic risk over years is a gradual dulling of polish from airborne quartz dust rather than any dramatic damage, and a soft cloth handles that. It is one of the few dark stones we carry that can be washed without a second thought.

What we will not claim

There is a great deal of confident writing online about black jade in ancient protection rites. Most of it is recent invention. Nephrite's documented history is rich and genuinely remarkable without embellishment, and where black nephrite specifically appears it is usually as tool stone. We would rather point you at the real record than a better story.