What the GI means
Dark tea holds the most consequential protected name in Chinese tea, and also the most misleading one.
Pu-erh（普洱茶）is protected, and the registration covers a defined part of Yunnan rather than a county.
It also names the leaf, which is Yunnan broad leaf assamica, and that is unusual for a geographic mark.
Anhua dark tea carries its own protection, as does Liubao from Guangxi.
All three are separate designations covering separate technologies, and buyers often mix them up.
In China a name can be protected 3 different ways, and Pu-erh uses more than one of them.
Product protection is the main route, administered by the national intellectual property office since 2018.
Certification marks are the second, and they are what collectors argue about when a cake is disputed.
The agricultural register is the third, and it plays almost no part in this category.
Outside China, Pu-erh is a generic term in most markets, and anyone can print it.
That gap between the Chinese registration and the foreign usage is where most of the confusion lives.
What it guarantees
The Pu-erh guarantee is narrow, and it is narrower than the name suggests on a wrapper.
The leaf has to be Yunnan broad leaf assamica, not small leaf from another province.
Growing area is fixed as well, and the registered zone covers a large part of the province.
Most of that area sits above 1,000 m, and elevation is part of why the leaf ages the way it does.
Process is fixed, which for raw pu-erh means sun dried green tea pressed into shape.
For ripe pu-erh it means the wet piling step, called wo dui（渥堆）, was carried out.
Those are genuine constraints, and both can be checked by someone who knows the material.
Broad leaf assamica has a larger, coarser leaf than a small leaf bush, and it shows in the brewed leaf.
Ripe tea has a dark, even liquor, and raw tea starts green and moves with age.
The Anhua and Liubao designations work the same way, each tied to a place and a method.
The 2021 agreement with the European Union lists 100 Chinese products in its first batch, and Pu-erh is among them.
What it does not
What the Pu-erh designation does not guarantee is the thing the market actually trades on.
It does not guarantee the mountain, and names like Bingdao and Yiwu are outside its scope.
Those are marketing designations with no registration behind them, and they are the most abused in tea.
It does not guarantee the age, which is the single largest driver of price in the category.
A date printed on a wrapper is a claim by the maker, and the mark does not verify it.
Storage is outside it, and after 10 years storage decides more than origin does.
Garden is not fixed, and factory tea and single garden tea carry the same protection.
Harvest year inside a blended cake is not fixed either, and blending is normal practice.
Raw versus ripe is settled by the maker’s own label rather than by the mark.
Enforcement is complaint driven, and the counterfeiters work faster than the complaints do.
The mark on a Pu-erh cake is close to meaningless at the top of the market.
How to use it
Treat the Pu-erh mark as background information and buy on three other things instead.
The first is the maker, since factory cakes are consistent and anonymous ones are not.
The second is the storage, and a clean smell with no damp note is the minimum you should accept.
The third is price relative to the mountain claim, because the gap there is where the fraud sits.
Learn the difference between raw and ripe before you learn any mountain name at all.
Learn factory tea before garden tea, since the price difference between them is smaller than the risk.
For Anhua, look for jin hua（金花）, the golden bloom that the fu brick is known for, and check that it is real.
For Liubao, check the basket smell, which should be clean and slightly woody rather than musty.
Both are cheaper than anything with a famous Yunnan name on the wrapper, and both are safer buys.
Use the protected name to rule things out rather than to rule them in.
A mark can tell you what a tea is not, and in dark tea that is genuinely useful.