Had a great email exchange with a Numberphile viewer to coincide with Pi Day.
Bryce, from Australia, showed me this photo of the engagement ring he bought his future wife.
He explained: "I chose the diamond for my finance's engagement ring based on Pi and so it is 0.314 carats. It was lucky that she wouldn't have worn a full scale Pi diamond at 3.14 carats because I couldn't have afforded that anyway!
"It is a round/brilliant cut, of course. I will be getting the Greek letter Pi engraved onto the inside of my wedding band so we have matching Pi rings."
Bryce went on to explain: "I knew for certain that she was the one when I told her the diamond was 0.314 carats, and she said 'you got me a Pi ring!'"