Hi again. You have a pretty good shot there of the necklace. on my Mac, I am seeing a reddish color cast on the silver type chain. Check your white balance. Composition is ok. What f stop are you using, stop down to the max I hope, f22-32. Clarity, focus and sharpness needs to improve. jewelry has to pop, whether on web or print. Study some of the top fashion mags like Vogue, Vanity, etc.
You are on your way, but for the price the jewelry is being sold for, you need to charge much higher fees. For $3-5 per image, someone from the street can come in with their cell phone camera and crank out that easy, but it will not be very appealing.
It is good you are getting experience, and I think you have a real knack to shoot jewelry. It takes the patience of Job to get it lookin' good, so keep at it! katt
Canon 10D and 30D. Tokina 80-200mm Pro 2.8 zoom, Sigma 50mm 2.8 macro, Sigma 10-20mm f4-5.6, Canon 28-135mm f3.5-5.6 IS, 2 AB 800