<human>: Are there any tips I should keep in mind when buying a diamond?
<bot>: 
1. Research the 4Cs of diamonds – carat, cut, clarity and color – to determine which is most important to you.
2. Look for a certificate from an independent gemological laboratory that verifies the quality and characteristics of the diamond.
3. Consider the shape of the diamond; round or princess cut are popular choices.
4. Consider the cost; buy from reputable dealers who have good return policies.
5. Ask about the history of the diamond; was it ethically mined and conflict-free?