Kyoto Origin Shirakawa gravel needed for watch project


Very random post, but I am looking to secure some Shirakawa gravel used in traditional Zen gardens originating from Kyoto.

The timepiece will be a celebration of the philosophy behind the zen gardens and I really want to source some materials from either:

One of the zen gardens them selves if they are maybe cleaning or discarding any stones or gravel.
Or

Kyoto origin Shirakawa gravel which is commonly used in Zen gardens.

If anyone can help or put me in touch with someone who may be able to help, please let me know.

Thank you

by SupJoshy