CAD generated designs are definitely not the be all an end all of Jewellery manufacturing.  Due to certain inherent characteristics of CAD generated castings, such as they are not as dense or resilient to damage as hand-wrought work, and that they generally appear clinical, sterile soul-less in their execution, we do not recommend CAD except where it is ideally applicable.  Lighter CAD designs can tend to age quickly and bend readily, unless specialised hardened alloys are used, which in turn can present problems later with sizing, repairs and such.  CAD designed and executed rings popularised through chain stores have become a headache for repairers, to the extent that many now refuse to work on them, so be very careful to consult with a competent jeweller as to the best options when choosing the method of manufacture for your jewellery.