Tyuuzou Honda has a video titled “The Art of Natural Stone“, note: I have altered the name of the video. This is a video of individual stone photos. The photos are high quality and is a great video to study stones and diaza’s. In addition to the video there is a blog by author. The blog titled “Suiseishi · Sansui scenic stone photo overview” is a large site with high quality photos of individual stones. You will need to use Google translator to navigate the site. It will take some effort on your part to navigate the site, but I am sure you can figure it out!! I have added the video and blog to the Suiseki page.