What a geographical indication actually guarantees
A geographical indication (GI) is a protected designation that ties a product name to a specific producing area, processing method, and quality standard. For Chinese green tea, the GIs are administered by the State Administration for Market Regulation.
An GI does three things. It restricts who can use the name. Producing area and leaf cultivar are the first part of the definition. Processing method and minimum quality standard are the second.
Roughly 50 GIs cover Chinese green tea at the national level, with another 30 to 40 at the provincial level. The system has been adding five to ten new GIs each year since the late 2000s.
An GI does not do three other things. It does not guarantee that a specific lot meets the standard, only that the producer is allowed to use the name. A non-GI tea is not necessarily bad, only that it cannot use the protected name. Price and grade are not in the GI, only the baseline standard.
For Longjing specifically, the GI covers three producing areas totalling roughly 168 square kilometres under GB/T 18650. Tea labelled Longjing from outside these three areas is not protected Longjing, regardless of cultivar.
Xinyang Maojian and Huangshan Maofeng have similar protected-area definitions under their own GB/T standards, covering comparable producing regions in Henan and Anhui.
Reading the label honestly
Reading the label honestly starts with the protected name. If a tea is labelled Longjing, the label should also say which producing area it is from. If it does not, assume the tea is from outside the protected area.
A genuine West Lake Longjing first-flush lot retails at two to five thousand yuan per 500 g. Tea labelled Longjing at a tenth of that price is almost always from outside the protected area.
The label should also show the producer’s name and a batch number. The batch number allows a buyer to trace the tea back to a specific processing run. Most legitimate producers print this on the package.
The grade on the label is usually a national standard grade, often translated as special, first, second, third and so on. These grades mean different things in different producing areas, so the grade alone does not tell you quality.
Be cautious of teas labelled with a regional name but no producing area. Biluochun without Dongting Mountain, Maofeng without Huangshan, Maojian without Xinyang. These are usually mid-grade leaf from outside the protected area.
Origin clues in the leaf and the cup
Origin clues in the leaf start with shape and colour. Genuine Hangzhou Longjing is flat, glossy and slightly yellow-green. Outside-Hangzhou copies are often paler, or slightly duller, or with broken tips that the hand-rolled Hangzhou version does not have.
Origin clues in the cup are about flavour and aroma. A genuine West Lake Longjing has a chestnut-like aroma and a sweet, slightly vegetal cup. An outside copy often has a more generic green tea character, without the chestnut note.
Processing clues are also useful. Hand-rolled Hangzhou Longjing has a characteristic flat sword-tip shape. Machine-rolled outside-Hangzhou Longjing has a more uniform but less defined shape.
Price is a strong but not infallible signal. A West Lake Longjing first-flush lot retails for two,000 to five,000 yuan per 500 g. Anything claiming to be West Lake Longjing at a tenth of that price is almost certainly not from the protected area.
Lab tests and what they can and cannot show
Lab tests can confirm or rule out a few specific things. Pesticide residue tests are useful because legitimate producers usually publish the result. Heavy metal tests are useful for the same reason.
Most producers publish one to three lab results per year. Asking for the latest batch result is fair practice and the producer’s response is informative.
Lab tests cannot easily confirm origin. Isotope analysis and trace element analysis have been used in some high-stakes fraud cases, but they are expensive and not generally available to the buyer.
DNA fingerprinting of the leaf is technically possible but commercially not used for green tea. Most authentication still happens through the GI system and through producer trust.
The practical move for a buyer is to buy from a producer who publishes batch details, accepts returns, and has been in business long enough to be traceable. The lab is a safety net for serious cases, not the first line of authentication.