: Always request a grading report from a reputable lab like the Gemological Institute of America (GIA) or IGI. This is your "C" for Certificate —proof of the diamond's quality.

: The diamond's weight. Prices jump at full-carat marks, so "buying shy" (e.g., 0.9 carats instead of 1.0) can save you money without a noticeable visual difference. 3. Verification and Safety

: Sites like Blue Nile and James Allen offer massive selections and lower markups (often 5-15% lower than physical stores). They provide high-resolution 360-degree videos and grading certificates to help you shop with confidence from home.