The perennially wonderful Ganoksin Project website has posted an old article from the MJSA Journal offering an interesting case study in using CAD modelling to amplify a classically designed filigree bespoke engagement ring made for a client commission. The design in question is one of the many excellent pieces made by Ron Litolff of Gemstone Designs. (His CAD work is strong enough to warrant adding to the Something Beautiful in Jewellery section).
While the story is rather lacking in imagery, he does provide an interesting step by step account of his approach to surface texturing in Gemvision Matrix Jewellery CAD. It contains some good suggestions for solving certain problems in making American Deep South style heavy engagement rings like the one you see below.