黒木碁石店

Clamshell Go Stones Premium Blossom grade

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¥35,000

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"Clamshell Go stones" are white Go stone made from clamshells.

Clamshell Go stones are manufactured by Go stones craftsmen one by one through more than 20 manufacturing processes. It takes about 2 to 6 months from the Clamshell to the product.
Please experience the brilliance of Go stones carved by traditional Go stones craftsmen, the techniques of making Go stones that have been handed down for over 100 years.

Quality: The highest quality with almost no scratches that has cleared strict selection standards.
Grade (striped pattern): The spacing between the stripes is a little coarser than "Snow grade", which is about 70% or less of the total.
* Please check the striped sample image.
* "Nachiguro" slate black Go stones are also included.

When select Go stones, it is important to "choose according to the purpose".

We recommend that you choose the one that suits the purpose of using Go stones, the scene, the Go game strength, ease of use, gifts, etc.

For beginners, children, and for everyday use, we recommend size 28-size36 because of its ease of use and ease of pinching with your fingers.
The thickness that is generally considered to be easy to pinch with fingers is said to be "size 30 - 36".
Go stones with a thickness of size 28 to 36 are practical, and depending on the quality and grade, you can select a Go stone in a relatively inexpensive price range.
If you want to buy a better one, or if you want a gift or a rare Go stone, we recommend a thick of size 36 to 50.
Clamshell Go stones have a large price difference depending on the thickness, so you can choose according to your budget and taste.
*Go stones with a thickness of size 40 to 50 may be out of stock due to the extremely small number of production.
Clamshell Go stones are completely different from glass made Go stones and plastic made Go stones in terms of touch feel, use feel and texture.
We recommend clamshell Go stones so that you can enjoy Go game to your heart's content.

  • Clamshell Go Stones, Premium Blossom grade
  • Thickness:
    W : White Go stones, B : Black Go stones
    size 28 : W/7.5 ㎜, B/7.8 ㎜
    size 30 : W/8.0 ㎜, B/8.3 ㎜
    size 32 : W/8.8 ㎜, B/9.1 ㎜
    size 34 : W/9.5 ㎜, B/9.8 ㎜
    size 36 : W/10.1 ㎜, B/10.4 ㎜
    size 38 : W/10.7 ㎜, B/11.0 ㎜
    size 40 : W/11.3 ㎜, B/11.6 ㎜
    size 42 : W/11.9 ㎜, B/12.2 ㎜
    size 44 : W/12.5 ㎜, B/12.8 ㎜
    size 46 : W/13.1 ㎜, B/13.4 ㎜
    size 48 : W/13.7 ㎜, B/14.0 ㎜
    size 50 : W/14.3 ㎜, B/14.6 ㎜
    *Our black Go stones are 0.3 mm large thicker and 0.3 mm large diameter than the same size of white Go stones.
    The reason is that white is an expanded color, so when you see white Go stones and black Go stones of the same diameter and thickness with the human eye, the black Go stones look a little smaller.
    So we adjusted them so that they look the same size.
  • Diameter:White Go stones/21.9㎜,Black Go stones/22.2㎜
  • Quantity:180 Clamshell White Go stones, 181 Nachiguro Slate Black Go stones
    Spare Go stones (2 for each)
  • Materials:White Go stones/Mexican clamshell, Black Go Stones/Nachiguro Slate from Kumano City, Mie Pref., Japan
  • with wooden box, Fabric Go stone bag, Quality certificate, Guidance
  • weight:about 2.2 kg ~ 4.5 kg
  • Actual shipping cost shall be coved by the customer.
  • Appropriate Go bowls size
    size 28 ~ 30/Large L
    size 30 ~ 36/Extra Large XL
    size 36 ~ 42/Super Extra Large 2XL
    size 42 ~ /Please check the size notation of the Go bowls.
    *An appropriate size is that the Go stones fit in about 80% to 90% of the Go Bowls.
  • Appropriate Go board
    size 28 ~ 30/Folding Go Board, Table Go board
    size 30 ~ 36/Around 60mm thick Table Go board, Go board with legs
    size 36 ~/60 ~ 100mm thick Table Go board, Go board with legs
    *This is just a guide, so please choose according to your preference such as material, board type, and thickness.
"Clamshell Go Stones Premium Blossom grade" is a quality go stone that meets our strict selection criteria, so we confidently recommend it.

Only 2 pieces in stock!

Points to consider when selecting Go stones

The key to choosing a Go stone is to 'choose the right one for the right purpose'.
Who uses Go stones? Go stones are used by yourself, your children, your grandchildren, everyone, etc.
User-friendly (easy to hold between fingers, easy to play) go stones for daily use? Thick and heavy Go stones? High-class Go stones? For gifts? For beginners? For a certain level of experience? How good is your game? Rarity? What are the most popular stones? We recommend that you consider these factors when making your selection.
For introductory and beginners
For children
For everyday use
Recommendation
Clamshell Go stones Blue Label
Clamshell Go stones Premium Blossom grade
● Size: size 28(thick/7.5 mm) - 36(thick/10.1 mm)
For beginners,children, and daily use, we recommend "Clamshell Go Stones Blue Label" or "Clamshell Go stones Premium Blossom grade", size 28 to 36. When you play Go stones, you put them between your fingers, and the thickness that is generally considered easy to put between fingers is "size 28 to 36". Therefore, Go stones with thicknesses of "size 28 to 36" are practical and relatively inexpensive.
Gift, Intermediate and above
For those who want high quality Go stones
If you "want to buy a better one because you are buying it," or if you want a gift or a high-quality Go stone, we recommend "Clamshell Go stones Premium Snow grade" and "Clamshell Go stones Blue Label Snow grade". The price difference between the two stones is large, so please choose according to your budget and preference. The feel, touch and texture of the Clamshell Go stones are completely different from glass or plastic Go stones.
If your budget allows, we recommend using a Clamshell Go stone when you want to enjoy the game of Go to your heart's content.

Value and Price

Materials
Hyuga Clam Shell
Mexican Clam Shell
Glass, ceramics, etc.
Plastics, etc.
High
Low
Nachi-Kuroishi from Kumano City, Mie Prefecture
Other Domestic Black Stones
Foreign black stone
Glass, ceramics, etc.
Plastics, etc.
Quality
In the case of white Go stones made from clam shells, it is very difficult to produce Go stones without flaws or colors, because there are flaws originating from the material, or flaws are caused in the manufacturing process, or the color of the material remains. In addition, our Go stones have an ideal Go stone shape for each size. Any stones that deviate significantly from this ideal shape are excluded from our products. In the case of Nachiguro Black Go stones, there is no difference in quality compared to Clam White Go stones because there are no stripes and the quality of the material is stable.
Premium grade
Almost flawless Go stones
All of our Go stones, white and black, are selected by our craftsmen for quality. Go stones with almost no flaws are classified as "Selected" grade.
Blue label
Go stones with slight scratches and color remaining
Go stones that have been carefully selected but still have slight flaws and color are classified as "Blue Label" grade. Go stones that do not meet the Blue Label standards will not be commercialized.
Grade
Clamshell White Go Stones Stripe Rank
Snow grade
Top quality (approx. 5-10%)
The grade of Clamshell White Go Stone is ranked by the stripes of the Go Stone. Clamshell White Go stones have stripes on one side of the stone (some stones have a little stripe on the other side). The side with stripes is called "Omote" and the other side is called "Belly". The more stripes on a Clam White Go stone, the thinner the stripes themselves are and the straighter and narrower the distance between stripes, the more beautiful and valuable the Go stone is.
Blossom grade
Grade (stripe) is less than Snow grade
Only clamshell White Go stones with more than 80% of the total stripes are the highest grade "Snow grade". Because only about 5 to 10% of all clamshell White Go stones are produced, "Snow grade" is a very rare and relatively expensive clamshell White Go stone. Striped Go stones that do not meet the "Snow grade" grade are classified by quality as "Premium Blossom grade" for stones with almost no flaws, and "clamshell Go stones Blue Label" for stones that were not selected carefully but still have slight flaws and color.
Size (Thickness)
The thickness of Go stones (Clamshell White Go stones and Nachikuro Black Go stones) are standardized from size 20 to size 50. Clamshell white Go stones are made from natural clam shells, and since only a small number of thicker shells can be obtained, the thicker the Go stone, the more expensive it is. Normally, we sell 12 types of Clamshell Go stones in even numbers from size 28 (7.5mm) to size 50 (14.3mm).
The thickness and diameter of our Go stones are slightly different between white Go stones and black Go stones of the same size. The thickness of Nachikuro Black Go stones is 0.3mm thicker and the diameter is 0.3mm larger than Clamshell White Go stones of the same size.
The standard diameter of the Clam White Go Stone is 21.9 mm, while the diameter of the Nachi Black Go Stone is 22.2 mm.
The reason for this is that white is an expansion color, so when white and black stones of the same diameter and thickness are viewed by the human eye, the black stones appear slightly smaller, so they are adjusted to appear about the same size. If the black stones look smaller on the board, it would seem psychologically disadvantageous, so the stones are adjusted so that they appear to be about the same size to the human eye.

Each clam shell stone produced in our workshop carries specific numbers on its surface. This numbering system will help us track our products and clarify our liability.
We will continue to make every effort to further improve the quality of our products and our quality assurance system.
*The numbers become visible when the stones are exposed to black (ultraviolet) light.

This new numbering system will help us further improve our quality control and assurance system.
Up until now, manufacturers had no unified sorting standards, which makes it hard for customers to distinguish genuine brand stones from inferior/second-hand ones.
Many customers find it extremely hard to know the true value of clam shell stones. We believe that our newly-introduced numbering system will help customers around the world understand our strong commitment to our products and liability.

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