The number is prominent. The Japanese words are ornate. It is tempting to read the front of a sake bottle as a ranking: junmai is good, ginjo is better, daiginjo is best, and a lower rice-polishing percentage must mean a better drink.
That is not what the terms say.
Japan has eight regulated special designations for sake. They describe raw materials, rice polishing and parts of the production method. Some also require the resulting aroma, flavour and appearance to meet stated conditions. They do not award points, set a retail tier or guarantee that you will prefer one bottle to another.
Optional to display, regulated when used
The National Tax Agency’s Sake Brewing Quality Labelling Standards were first applied in 1990. A producer is not required to put a special designation on qualifying sake. But if the label does use one, the sake must meet that designation’s conditions.
That distinction matters. The system is not an award and the words are not a complete hierarchy. It is a government labelling standard whose use is optional.
The eight names on the shelf
| Label term | Main ingredients | Rice-polishing rate | What else is required |
|---|---|---|---|
| Ginjo-shu 吟醸酒 | Rice, koji rice, brewing alcohol | 60% or less | Ginjo production; characteristic aroma; good flavour and appearance |
| Daiginjo-shu 大吟醸酒 | Rice, koji rice, brewing alcohol | 50% or less | Ginjo production; especially good characteristic aroma and appearance |
| Junmai-shu 純米酒 | Rice, koji rice | No maximum | Good flavour and appearance |
| Junmai ginjo-shu 純米吟醸酒 | Rice, koji rice | 60% or less | Ginjo production; characteristic aroma; good flavour and appearance |
| Junmai daiginjo-shu 純米大吟醸酒 | Rice, koji rice | 50% or less | Ginjo production; especially good characteristic aroma and appearance |
| Tokubetsu junmai-shu 特別純米酒 | Rice, koji rice | 60% or less, or a stated special method | Especially good flavour and appearance; the special basis must be explained |
| Honjozo-shu 本醸造酒 | Rice, koji rice, brewing alcohol | 70% or less | Good flavour and appearance |
| Tokubetsu honjozo-shu 特別本醸造酒 | Rice, koji rice, brewing alcohol | 60% or less, or a stated special method | Especially good flavour and appearance; the special basis must be explained |
Every one of these designations also requires koji rice to account for at least 15% of the total rice weight. That threshold is easy to omit from simplified English charts because it does not divide the rows, but it is still a condition of every row.
Read 50% as “half remains”
The rice-polishing rate, 精米歩合 (seimai-buai), is the weight of the polished rice as a percentage of the original brown rice. It measures what remains, not what was removed.
- 60% means 40% of the outer weight was removed.
- 50% means half remains and half was removed.
- A lower number therefore means more polishing.
It does not mean “50% quality,” nor does the standard say that a 35% bottle must taste better than a 50% bottle. Once a designation’s ceiling has been met, extra polishing does not create a higher legal category.
There is one especially useful correction to old explainers: junmai-shu has no rice-polishing maximum. Its former 70% ceiling was removed in 2004. A plain junmai can therefore show a number above 70% and still be correctly labelled, provided it meets the other requirements.
Added alcohol is a category difference, not proof of dilution
The word junmai tells you that the sake was made from rice and koji rice without brewing alcohol as an ingredient. Plain ginjo, daiginjo, honjozo and tokubetsu honjozo may include brewing alcohol.
For a specially designated sake that uses it, the permitted brewing alcohol is capped: its weight, calculated at 95% alcohol, cannot exceed 10% of the polished rice weight. The National Tax Agency explains that a controlled addition can lift aroma and produce a cleaner taste. Its presence separates categories; it does not by itself show that the bottle is counterfeit or low grade.
This is why daiginjo does not necessarily mean junmai. If avoiding added brewing alcohol matters to you, look for the complete phrase junmai daiginjo and confirm that the ingredients list reads rice and rice koji.
“Special” needs a reason
Tokubetsu junmai and tokubetsu honjozo have two routes. The polishing rate can be 60% or less, or the producer can rely on another special production method. The label must objectively explain what makes it special. Tokubetsu is therefore not a free-standing flourish.
The sensory wording has a limit too. “Good flavour and appearance” means that the sake has its proper character without an abnormal taste or smell. It is a fitness condition, not a promise that an official tasting panel ranked this bottle above every non-designated sake.
A four-part shelf check
When you are holding a bottle, read these together:
- The full designation. Daiginjo and junmai daiginjo are not the same ingredient category.
- The ingredients. 醸造アルコール means brewing alcohol. Rice and rice koji alone support a junmai designation.
- 精米歩合. The figure is required near the ingredients on specially designated sake. Remember that it shows rice remaining.
- The explanation beside 特別. If “special” depends on a production method rather than a polishing rate of 60% or less, the basis should be stated.
These checks tell you what the regulated words establish. They still do not tell you whether the sake is dry, whether you will enjoy it warm, whether a famous rice variety dominates the blend, or whether a more aggressively polished bottle is worth its price. Those are separate questions, and the label should not be asked to answer them by implication.