What makes a walnut worth handling for years?

This is an English reading overview of the Chinese article, rather than a complete translation. The Chinese source has been updated since this overview was prepared; consult the original for the latest details.

The central idea

Long-term suitability cannot be established by a variety name, weight, dimensions or price. Maturity and the shell’s underlying structure matter, alongside a stable natural surface. Collector terms such as shell quality and oiliness describe combined experience, rather than a single scientific measurement. Exclude risks before considering appearance and personal fit.