According to diamonds.pro, a 1 carat diamond costs anywhere between $1,800 and $12,000. However, a quality diamond doesn't just come down to size. Buy Jewellery Online in Pakistan. When assessing stone value four very important factors are always taken into consideration - the four c's of diamond quality: color, cut, clarity and carat.A budget of two thousand dollars for a diamond ring isn't exactly high but it's still a decent price range to find something nice. While it is possible to find affordable options that are both beautiful and elegant, you shouldn't harbor any unrealistic expectations like buying a 1 carat diamond ring with a 2k budget.