Diamond education
Round engagement rings
How it looks, what to check, how to set it.
By the CTJ Jewellery team, led by founder Greg Ward · Updated September 2026 · Editorial policy
Key facts
- The most brilliant shape
- 57 or 58 facets
- Suits every setting
- Hides colour and inclusions well
- Highest price per carat
- Cut grade matters most
What to check
- An excellent cut grade on the report
- Eye-clean clarity, checked in person
- Colour matched to the metal
Best settings
- Four- or six-claw solitaire
- Halo for extra presence
- Hidden halo for side sparkle
- Three-stone with round or pear side stones