Hmmm... If I thought a question about ring stats was asked so that it could turn into an 'I want to one up you' type of conversation, I probably wouldn't answer with my information to start with. I may even feign ignorance. I would imagine it going something like this:
peer: Oh, what color and clarity is your
GF: I'm not sure, I never really thought to ask DiamondHunter. I was too swept up in the moment of him sharing how much he loved me and wanted to spend the rest of my life with me to worry about what the statistics of the ring were. I know he did take a lot of time to find something as unique as I am to him.
I am also a fan of the 'bean dip strategy.'
peer: My ring is D/VVS1.
GF: Yes, it's a beautiful ring. Would you pass the bean dip?
peer: What's the size of your center stone?
GF: The perfect size for me. Would you like some bean dip?
peer: Your ring looks a little yellow.
GF: Isn't it beautiful? Can I get your recipe for this delicious bean dip?
Please feel free to replace bean dip with anything appropriate for the situation.
The goal of the bean dip strategy is to set boundaries by not getting into the habit of defending your choices to people who don't really care to learn about them, but are rather just in it to be argumentative. I find the bean dip strategy to be invaluable if you live your life to a slightly different tune than others.
I perfected the strategy when I got married at 22.
random person who knows nothing about my life: Wow, you are so young to be getting married. Shouldn't you wait until you have more life experience?
me: I'm so happy. Would you pass the bean dip?
Once you get the hang of it, it really is fantastic.