This is a word of thanks for PentaxForums.
My partner and I have launched our new business selling diamond engagement rings on the Internet for the Japanese market. And we couldn't have done it without the photography advice that I got from this forum, such as:
https://www.pentaxforums.com/forums/general-photography-techniques-styles/624...elry-look.html
For those curious to see the set of product photos that I made with the technique I developed, you can start
here. The site is entirely in Japanese. Again, thanks to everyone at PentaxForums for making this a site worth visiting to ask such questions in the first place.