For most buyers, the best grade to buy is the one that is " "—meaning it looks perfect to the naked eye without paying for microscopic perfection. While the absolute highest grades are D (Colorless) and FL (Flawless), they command a massive price premium for rarity that you cannot see without professional tools. Recommended Value "Sweet Spots"
To maximize your budget without sacrificing visual beauty, consider these expert-recommended ranges: Guide to Diamond Color: Scale & Grading Chart - Blue Nile what grade diamond should i buy