The Temple St Clair Celestial Pendant is beautiful from the design and engineering perspective. (It is featured on page 36 of the November 2010 Town & Country.) Each one of the concentric circles moves independently of the others. (I could not find a photo of the pendant to share but the earrings are made in a similar manner.)
Please take the time to watch the Temple St Clair video. It gives you a window into the mind of a jewelry designer.
Ornamental Elements 