Drawing, like any other technique, or the things you are good at, your tools at hand, or your raw materials, will influence the kind of output you produce Ring sketch by http://www.xennoxdiamonds.com.au/
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A spring ring clasp opens when you push backwards on a little lever that slides along a circular ring. Once the clasp is open open you simply insert the chain or loop that's attached to the piece you're connecting into the open circle, then release the lever to return it to the closed position. There's a tiny spring inside the clasp that puts pressure on the mechanism to keep the spring ring shut until you decide to open it again.
How to draw a ring Google Image Result for http://www.fashiontechniques.com/fig/drawing_jewllery1.jpg
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Vintage diamond ring (sketch)
Silver leva ring by Silva/Bradshaw
Mark Schneider Design - sketch of Vision engagement ring with a pear cut diamond center