Rock IdentifierJade: Jadeite vs Nephrite
Key takeaways
- 'Jade' covers two minerals: rarer, harder jadeite and tougher, more common nephrite.
- Both are extraordinarily tough (hard to break) thanks to interlocking fibers.
- Dyed jade, treated 'B-jade,' and many cheaper stones sold as jade are common.
Two minerals, one name
'Jade' is a cultural term covering two distinct minerals. Jadeite (a pyroxene) is rarer, slightly harder (6.5–7), and the source of the most valuable 'Imperial' green jade. Nephrite (an amphibole) is more common, slightly softer (6–6.5), and comes in creamy whites and greens. Both owe their legendary toughness to densely interlocked fibrous crystals — jade resists breaking even though it isn't the hardest gem.
How to recognize jade
Genuine jade feels cool, dense, and heavy for its size, with a smooth, slightly greasy-to-glassy luster and no visible grain. It's translucent to opaque and remarkably tough — it won't chip easily. Color is usually uneven, with subtle mottling or veining rather than perfectly uniform green.
Imitations & treatments
Jade is one of the most imitated stones. Watch for: dyed jade (color concentrated in cracks, sometimes fading over time); polymer-impregnated 'B-jade' (bleached then resin-filled); and entirely different green stones sold as jade — serpentine, aventurine quartz, chrysoprase, dyed quartzite, even green glass. Glass gives itself away with bubbles and a warmer feel; softer serpentine scratches more easily.
Value & verification
Fine translucent Imperial jadeite is among the most valuable of all gems, while common nephrite is modest. Because so much on the market is treated or substituted, and value swings enormously, high-priced jade really should come with a reputable laboratory report rather than a seller's word or a phone photo.
