I have a similar experience to what you are referring to. In my previous job, I got engaged a few months earlier than a coworker in the office. My DH got me my dream ring, the Victoria E-ring from Tiffany and when my coworker saw it, she told me it was the biggest and the most beautiful ring she's ever seen and she absolutely loved it. Then a few months later, she got engaged as well and her DF got her a 1ct classic Solitaire from the jewelry district which to me was absolutely beautiful.
Shortly after that, while we were having an open conversation with a few other ladies in the office, my coworker expressed how she didn't understand why people would go to Tiffany,
it's so much more $$ for the same thing. She turned to me and said, "I know you like Tiffany so I am not saying there is anything wrong with that, I am just saying I would never go there...it's so not worth it"
I just smiled.
Now I am not sure if I am being too sensitive but to me, I felt like she was trying to defend herself or her E-ring, explaining why it's not from Tiffany when no one was comparing to begin with?! I think that was a sign of insecurity.