You might take a look at the Kmart website as well. Right now they are having a 70% off all gold jewelry, and sometimes you can get a good bargin there.

Don't just go by price or diamond size, become familiar with how the QUALITY of the diamond is assessed (cut, carat weight, clarity, and color).

Google "diamonds" and you will find websites that explain these terms. Don't rely on the salesperson to educate you. Go into the store already having this knowledge.