Six months seems a bit rapid unless you never take the necklace off! I always tell customers to look at the necklace for fraying or stretching and that is when ...
cynically of course using silk every time brings in more work! Although i usually do our own stuff free or cheaply
Yes, I know it's rapid. Far too rapid, in my opinion, however, this advice from GIA (Gemological Institute of America) does illustrate the problem with silk.
And, that's why I don't use it on anything but the most expensive pearls and why I always discuss the choice with clients.
I, too, do client work cheaply and/or for free AND because I rarely use silk, I don't have to do much of it! (Or at least I very rarely need to re-do my own work.)
By the way, this discussion prompted me to write an article about french wire you may have some interest in. It's on the website under articles and resources. http://fsommers.com
Regards and thanks for a thoughtful discussion-