the size of a diamond you could get for $3000 depends on up-to-date, consisting of the fine (cut, color, clarity) of the diamond, up to date cutting-edge marketplace conditions. usually, smaller diamonds with better quality will cost less than larger diamonds with decrease first-rate. As a up to date estimate, you is probably up-to-date get a diamond within the range of 0.50 up-to-date 0.75 carats with up-to-date exceptional (thinking about cut, shade, and clarity) for $3000.