In the UK there likewise known as russian wedding rings.
Also there made here by most students as part of their jewellery
courses.
As to copyright, certainly the name Cartier is copyrighted as a
registetred trade name and rightly so but as to the design, well,
Cartier are just trying it on as we say over here. That generic design
has been around as a 3 coloured interlocking ring since metals have
been around in 3 colours.