Color
Beyond a point, this one changes the price more than the stone. It is where most people overspend.
Graded D (colorless) to Z (light yellow or brown). Set in yellow or rose gold, G to J look just as white as D to F to the naked eye and cost noticeably less. Only side-by-side under white light can most people tell D from G.
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Carat · Certificate · Clarity · Cut · Eye-Clean · Fluorescence · Lab-Grown Diamond · Ratio · Table and Depth