C.
My parents and in laws recently celebrated their 40th anniversaries. We bought the same gifts for both of them and making it to be a something very memorable. Since 40th in ruby, we found Waterford ruby crystal champagne flutes and a bottle of champagne. They loved them. The 50th anniversary I believe is golden so you could find something crystal with a gold band (you can find great daels or ebay or at outlets/costco) or something from things remembered and have it engraved. We found that by this point in their marriage and lives there was not a lot that they really needed but this was something that showed what a memorable celebration it was. Hope that helps!