For a medium budget we recommend as a good standard quality color G/H and Si1. Color: For white gold & platinum, choose G in any case. For rose gold and yellow gold, an H is also quite legitimate, as the stone takes on a certain yellow tint due to the alloy anyway. Clarity: With Si1, you can expect an "eye-clean" diamond. The inclusions are especially visible under a magnifying glass. However, we do not recommend going below Si1. The inclusions can be visible to the naked eye and can severely diminish the sparkle.