| Factor | What to Look For | Why It Matters |
| Carat weight | Accurate measurement | Helps establish the diamond's size |
| Colour | Professional assessment | Colour can influence market value |
| Clarity | Identification of inclusions | Affects rarity and desirability |
| Cut | Assessment of proportions and finish | Influences brilliance |
| Certification | Verification where available | Supports confidence in the diamond's characteristics |
| Market considerations | Current buyer demand | Can influence the potential offer |