Dear all sifu,

Recently i am doing survey on proposal diamond ring (white good). I found that have 3 types of ring
1.) Ring with GIA certificate
2.) Ring with diamond shop in house certificate
3.) Ring without certificate

Here is my few question
1.) It is true the ring with certificate is so important?
2.) If i buy ring without certificate it is very likely the diamond spec show by the shop will be not accurate and also high chance will be get cheated by the shop?
2.) If i buy ring without certificate from reputable shop such as Wah chan or lazo diamond? It is more safe?

My budget is tight only around 2.5k. I really hope all sifu can give me advice. If certificate is really that important i will go for it. Thank you.