CAD has also led to innovative techniques, such as “Invisible Setting”, which further promotes the use of marginal stones in what amounts to disposable jewellery. When these invisibly-set stones fall out, which they inevitably do, they are all but impossible to replace properly and securely. My friends in the repair industry hate doing “No Guarantee” work, but are forced into it by the inherent insecurity of the modern setting techniques. We like to stand behind our work, but if the basic structure of the piece is compromised, there is little recourse.
Granted, I've drifted away from the initial subject of diamonds, but I get all enraged sometimes, and my mind wanders. I'll come back when I'm more focused.