Good control of teh lighting hee.
Soft light and negative space work here, though some reddish details are visible in the background. A little unsure what it actually is, be it a ring or pendant. (5)
I really like the composition of this shot and the lighting is great. However the focus is on the gold, not the pear, which by your title I would assume you were trying to showcase in the ad.
I like the composition with the item set in the lower left third, and nice bit of negative space. What I think could have been improved upon is the lighting off the pearl. There's quite a nice contrast lighting on the metal, but the pearl appears to be too dark relative to the rest. I suggest perhaps shining a soft light from the top right to create a spotlight like effect, which illuminates the immediate vicinity of the item. This would also aid in grounding the object and thereby give some frame of reference.
Ok, nice shot. The shadows of the background used are a bit distracting. It would be nice if there was one major reflection on the top of the pearl. The lighting and focus on the gold is good. For this challenge you may take a minor hit for not having any text, especially with all the negative space available. I know, text was not required for this challenge, but I think most voters are going to be looking for some with a photo such as yours. Overall, good job. Good luck.