Depends on what you intend to take you pictures for. If it is to record your work and post pictures on a web site, you might get all you need from a modern compact camera, which will also double for social purposes.

Stick with either Nikon or Canon and study the hand book and you will build up a knowledge base for that marque that can still be used should you upgrade in the future. You might start with the fully automatic function and gradually experiment with the others.

Read the reviews on line and aim for a mid range price within you budget. Superseded models will be cheaper.

There are many online tutorials on 'table top photography', 'product photography' and 'photographing jewellery'. Dennis.