How to tell if jade is real: jadeite, nephrite and common imitations

Real jade is one of two tough rocks: jadeite or nephrite. The most common impostors are serpentine, dyed quartz or calcite, aventurine and glass, and much jadeite on the market is bleached and polymer-filled. Weight in the hand, surface luster, dye in cracks and bubbles in glass are useful home clues, but only a gem lab can confirm jade and detect treatment.

By the Antique ID team · Updated 2026-10-13

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What "jade" actually means

Jade is not one mineral. The Royal Ontario Museum explains that it is a lapidary term for rocks made mainly of jadeite or nephrite, two different minerals with similar properties. GIA describes jade as a generic term for nephrite, jadeite and, under certain conditions, green omphacite. Both are prized for their toughness: neither is especially hard, but their interlocking crystals make them extremely resistant to breaking, which is also why they are slow to carve.

The ROM notes that nephrite is the more widely found of the two, occurring on every continent, with British Columbia an important source today.

The usual impostors

Serpentine

The ROM calls serpentine the most ubiquitous jade impostor. It often has a waxy or greasy feel and is far softer than jade, about 3.5 to 4 on the Mohs scale, so it shows scratches and worn edges more readily. Trade names such as "new jade" and "lemon jade" refer to serpentines.

Green quartz: aventurine, chrysoprase and dyed quartz

Quartz is about as hard as jade, so a scratch test will not separate them. The ROM points to the coloring agent instead: aventurine gets its green from tiny flakes of a chrome mica, fuchsite, which glitter under a loupe, and chrysoprase is colored by nickel. Dyed quartz and quartzite are also sold as jade; magnification often shows a granular texture with color concentrated between the grains.

Dyed calcite ("Mexican jade")

According to the ROM, material sold as "Mexican jade" is usually dyed calcite, sometimes cut from cave formations. Calcite is soft (Mohs 3), less dense than jade, so it lacks jade's heft, and dye pools in cracks, giving deeper color along the lines.

Glass and plastic

Molded glass imitations can show round gas bubbles, swirl lines, mold seams and shell-shaped (conchoidal) chips at the edges. Plastic is light, warms quickly in the hand and may show mold seams.

Treated jadeite: A, B and C jade

Much commercial jadeite is treated. A 1992 study published in GIA's journal Gems & Gemology described "bleached" jadeite as a two-step process: brown or gray staining is removed chemically, then the porous, whitened material is impregnated with a polymer. This product is known in the trade as B jade. The authors found infrared spectroscopy to be the only method that conclusively detected the polymer in every case. Dyed jadeite is commonly called C jade, and untreated jadeite, apart from conventional waxing, is called A jade. Because treatment cannot be reliably seen with the eye, buyers of valuable jadeite ask for a laboratory report.

Safe checks at home

• Heft. Jadeite and nephrite are noticeably heavier than serpentine, calcite, quartz, glass or plastic of the same size. Comparing with a known piece helps.
• Loupe. Look for glittering flakes (aventurine), dye in cracks (dyed stones), bubbles and swirls (glass) and the fine, interlocking texture typical of jade.
• Luster and feel. A waxy, soft-looking surface with many fine scratches suggests serpentine; jade takes a hard, bright or oily polish.
• Light. Shine a small flashlight through a thin edge to see texture and color distribution.

Avoid scratch tests, acid, heat and "burn" tests on anything you value. They can damage the piece, and a scratch test cannot tell jade from quartz anyway. Specific gravity and refractive index measurements by a gemologist are non-destructive.

What drives value

For jadeite, color, evenness and translucency are paramount, with an intense, even green the most valued, followed by texture and whether the stone is untreated. For carvings in either jade, the quality of the carving, age, period style and provenance matter as much as the material. Antique Chinese jade carvings are a specialist field with many later copies, so expert examination is essential. To get a quick first opinion, scan the piece with Antique ID for an identification and an estimated value range. An estimate is not an appraisal: for jadeite jewelry or carvings that may be valuable, obtain a report from an independent gem laboratory and an opinion from a qualified appraiser.

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