| What to Consider | Why It Matters |
| Diamond grading | Shows the stone's carat, cut, colour and clarity |
| Certificate | Provides supporting information about the diamond |
| Metal | Gold or platinum can add to the overall value |
| Condition | Damage or repairs may affect the offer |
| Original documents | Can help provide useful background information |
| Current market | Prices can change over time |
| Buyer experience | Specialist knowledge can lead to a more informed valuation |
| Selling method | Consider whether an in-person or postal service is more suitable |