Dating, describing Flair Originals diamond shaped sunglasses

[Robin of Frocksley]

These sunglasses look 60's to me, does that seem correct? They strike me as very "mod". Wondering if there's a specific term for this frame style, or a better way to describe them than "diamond shaped". Any ideas? Thanks!

 

[Pinkcoke]

cat's eyes

I'm not sure if they aren't earlier than late 60's, thinking early to mid.