US guides
The diamond does not get whiter because the band is expensive.
If the US jeweler has not been chosen, assume white metal and buy a color you can live with in that case. You can always set a whiter stone in yellow gold.
The reverse hurts: an I color bought for yellow gold can look warm if you later move it to platinum.
Compare F, G, and H at your carat before the setting is designed. 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.