Here are some important things you should consider before buying a diamond jewellery:
1. Have a look at diamond shape(round, princess cut, etc..)
2. Carat weight - diamonds and other precious stones are measured in carat weight. Larger diamond size, increases in the carat weight.
3. Check diamond clarity
4. Diamond color
5. Metal Type- Platinum will cost more than gold. People prefer gold jewelry more. White gold metal are popular choice for an engagement ring