hello everyone, I just started creating photos on the site, can you see if this is suitable?

In addition to @RALPH_L's great advice, the direct lighting is causing the light to appear uneven and leaving some harsh shadows, and one of the gems is cut off in the frame. 

The paper background in the other photos is distracting, and I think the depth of field is too shallow in most shots, leaving the subject out of focus.

Good luck with your future submissions!

The first photo is too dark, thge white balance is off and the phone and trademark belong to Apple.  You cannot use it without a release.