'Ruby' aniversary

Today (well Sunday this is a backblip) we were invited to a party to celebrate friends' 30th wedding aniversary. Wracking my brains to think what to give them. I had a brilliant idea. Thirty is ruby right? I have just made some rather good (if I say so myself) strawberry jam. Give it a clever name label artily et voila!

Er... No

Thirty is pearl. Oh well they get the jam anyway