Diamond education
Engagement ring buying guide
Every decision, in the order that makes it easiest.
By the CTJ Jewellery team, led by founder Greg Ward · Updated September 2026 · Editorial policy
Key facts
- Budget first
- Natural or lab-grown
- Shape, then setting
- Cut matters most
- Confirm ring size early
- Custom rings in about 2 to 3 weeks
The eight decisions, in order
| Step | Decision | Guide |
|---|---|---|
| 1 | Budget | How much to spend |
| 2 | Natural or lab-grown | Compared |
| 3 | Shape | Diamond shapes |
| 4 | The four Cs | The 4Cs |
| 5 | Setting | Settings and metals |
| 6 | Metal | Platinum vs white gold |
| 7 | Ring size | Ring size guide |
| 8 | Timing | Custom design |
Shape guides
Planning around a proposal date
Allow at least three to four weeks for a custom ring, including consultation and approvals. A solitaire with an in-stock diamond can be ready in about one to two weeks.