One-carat diamond price: what determines value

One carat does not mean one price.

Carat measures weight, not dimensions, quality or value. One 1.00 ct diamond can be priced very differently from another because of shape, colour, clarity, cut, proportions, fluorescence, grading report, origin and current availability.

Demand around milestone weights such as 1.00 ct can create a price step. A static figure in an article should therefore never replace a comparison of current stones with closely matched specifications.

What moves the value

1. Cut and proportions. These affect light performance and face-up size.
2. Colour and clarity. Each grade should be considered alongside imagery and inclusion placement.
3. Shape. Round and fancy shapes have different yield, demand and pricing dynamics.
4. Laboratory and report. A verifiable number connects the offer to the graded stone.
5. Origin and market. Natural and lab-grown supply move differently.

Compare the final commercial picture

Check whether the displayed value includes applicable tax and whether shipping or duties may arise for the destination. Prices and availability in the platform are dynamic; final terms are confirmed for the exact stone.

Compare several closely matched offers and open the original grading reports. The lowest price is not automatically the best choice, and the highest price is not evidence of a better diamond.

Current offers around one carat

Open natural diamonds from 1.00 to 1.09 ct or lab-grown diamonds from 1.00 to 1.09 ct. This is a starting selection by weight; align shape, colour and clarity before comparing prices.

For exactly 1.00 ct, set the upper limit to 1.00. If visible size matters more than the round number, also compare 0.90–0.99 ct natural diamonds by measurements in millimetres. Check the individual offer; this does not promise a particular discount.

Calculation example: a hypothetical €2,000 price for a 1.05 ct stone gives €2,000 ÷ 1.05 ≈ €1,904.76 per carat. These figures illustrate the formula and are not an offer. Keep the stone, tax, shipping and jewellery manufacture separate in your comparison.