US guides
The premium is largest on natural stones because colorless natural crystals are scarce.
If your US setting is yellow gold and the stone is under 1.5 carats, compare G before you pay for D. If the setting is platinum and the stone is over 2 carats, look at D–F seriously.
Hold clarity and cut constant so the USD gap is only the color.
Open a D and a G natural listing at the same carat and decide with your eyes. Carat Mate ships the certified loose diamond and its lab report to United States addresses. Prices on the site are in USD. Wrong-item returns may be considered within 3 days of delivery, subject to review.