Old Mine vs New Mine Jade (Laokeng vs Xinkeng): What the Terms Really Mean

If you have shopped jade for long, you have run into a seller describing a piece as old mine, old pit, or laokeng jade, usually with a higher price attached. It sounds like it means the jade was dug up a long time ago. It does not. Here is what the term actually describes, and how much weight to give it.

Old mine and new mine describe the stone, not the calendar

Laokeng translates as old mine or old pit, and xinkeng as new mine or new pit. Despite how they sound, these terms do not refer to when a stone was mined or carved. They refer to the geological history of the material, and therefore to its texture.

• Xinkeng, new mine. Jadeite taken from the primary deposit, still sitting where it formed. It has not been through major geological reworking.
• Laokeng, old mine. Jadeite from a secondary deposit. After forming, the stone was broken loose and moved by weathering, seismic activity, and river water, sometimes over enormous spans of time.

A piece of laokeng jade mined last year is still laokeng. A piece of xinkeng jade sitting in a collection since 1920 is still xinkeng.

Why the difference shows up in the stone

That long tumble downriver is a brutal natural quality filter. Weak, fractured, coarse material breaks apart and does not survive the journey. What arrives in the river gravels tends to be the denser, tighter, more durable stone.

The practical differences buyers can see and feel:

1. Skin. Secondary-deposit boulders carry a weathered outer rind. Primary-deposit rock generally has no skin.
2. Grain size. Old mine material tends toward smaller crystal grains; new mine material tends toward larger ones.
3. Texture. Finer grain means a smoother surface and a higher, crisper polish. Coarse grain looks grainy under angled light no matter how well it is finished.
4. Water head. The trade term for transparency. Old mine material generally shows better light transmission, the quality that makes jade glow rather than sit flat.
5. Density. Old mine material tends to run slightly heavier in the hand, with a marginally higher specific gravity.

That combination, tight grain plus real translucency, is exactly what jadeite is valued for. Which is why old mine material generally commands a substantially higher price than new mine material of the same color.

The part sellers do not usually mention

Laokeng is trade language, not a gemological grade. No laboratory will issue a report certifying a stone as old mine, because there is no test for it. A gemological report tells you the species, whether it is jadeite, omphacite, or kosmochlor, and whether it has been treated. That is the certification that actually protects you.

Which means old mine is a description that anyone can apply to anything. It is not fraud when used honestly by an experienced dealer describing genuinely fine-textured, translucent material. It becomes marketing noise the moment it gets stapled onto ordinary stone to justify a price.

There is a simple defense: judge the stone, not the label. If a piece is described as old mine but photographs flat, opaque, and coarse, the label is doing work the jade cannot do.

What to prioritize instead

You do not need the vocabulary to buy well. You need to look at the qualities the vocabulary is trying to point at:

• Translucency. Ask for a backlit photo and see how deep the light travels.
• Texture. Look at the surface under raking light. Smooth and glassy beats sugary and grainy.
• Luster. Untreated jadeite has a crisp, vitreous shine. A soft, waxy look can signal resin.
• Color quality. Saturation and evenness matter more than which specific color it is.
• Treatment status. This is the one thing that is verifiable, and the one thing that determines whether your jade looks the same in twenty years.

Where treatment fits into all of this

Here is the trap. Coarse, poorly transparent jadeite is precisely the material most likely to be acid-bleached and resin-filled, because the treatment temporarily improves transparency and cleans up staining. A Type B stone can be dressed up to mimic the look people are chasing when they ask for old mine jade. It will not hold. The polymer resin oxidizes with heat and light, and the piece yellows and dulls over the years.

So old mine versus new mine is a conversation about quality tiers. Type A versus Type B or C is a conversation about honesty. The second one matters more.

Buyer checklist

• Treat old mine and laokeng as a description, not a guarantee. Ask what specifically makes the seller say it.
• Require a clear written statement that the piece is natural Type A, untreated and undyed.
• Ask for backlit and natural-light photos of the exact piece.
• Judge translucency, texture, and luster with your own eyes before you weigh any trade term.
• Be skeptical of any premium justified purely by vocabulary.

At Brother Ryan Shop we keep it simple: every piece is authentic natural Type A Burmese jadeite, sourced directly from Burma, never bleached, resin-filled, or dyed. Each stone is one of a kind and verified live before shipping from Clovis, California, so you see the real piece and never a stock photo or a substitution. Browse jade jewelry, or start with jade bangles and bracelets and judge the stones for yourself.