Kaya is regarded as one of the best materials to make Go and Shogi boards, because of its good sound and feel when placing the stones, moderate elasticity, beautiful grain, color, gloss and luster, and aroma.
There are three types of kaya trees: "Hyuga kaya" which is grown and harvested in a mountainous area in the southern part of Kyushu, Japan, "Japanese-grown honkaya" which is grown in other areas of Japan, and "China-grown honkaya" which is mainly grown in Yunnan Province, China. Generally, Japanese-grown honkaya is said to be better than Chinese honkaya in terms of quality.
Chinese kaya tends to be less valued than Japanese kaya due to its reddish wood color, wood quality, and rarity, but this material is often sold at a relatively affordable price for a high-quality board.
*Go board materials are explained detail in "How to choose a board".
Please take a look.
Go to "How to choose a board".