The charity has warned that cats could come to harm if their collar gets caught or embedded in their skin.
Cats have been found with infected wounds left from collars and suffering from deadly flystrike, which occurs when maggots make themselves at home inside the cuts.
The RSPCA’s Jason Finch told the Mail Online: “Buckles and elasticated collars can be lethal if cats get stuck somewhere.
“This serves as an important reminder to only use collars which snap open without human help.
“It is all very well dressing your cat up in a diamante collar so they look nice – but owners also have a responsibility to make sure their animals are safe.”
Dogs are required to wear a collar, whereas pet owners can opt whether or not their cats are collared.
The RSPCA has recommend that animal lovers should microchip their pets instead of using collars with name tags.
This will prevent your cat from any collar or buckle related danger as well as making them identifiable should they become lost.
Find out more about how to keep your pet safe at www.rspca.org.uk