Reputable jewelers provide certificates (e.g. IGI, GIA) verifying diamond quality — especially for larger pieces. Also look for a warranty or after-sales care (cleaning, prong tightening) to preserve value and durability. https://www.tumblr.com/divourdiamonds/801456107950342144/smart-ways-to-buy-a-diamond-tennis-bracelet-this?source=share