The design features a post that slides easily through the hole in the back of the hoop behind your ear, which secures the earring.
Gold filled jewellery is also known as rolled gold or gold bonded and is created by mechanically bonding a layer of gold to a layer of base metal - usually brass. The outer gold layer must be at least 1/20 of the overall metal content by weight. Therefore it makes a great alternative to gold plating, which is thinner and less durable.
The hoops measures 24mm and has a thickness of 1.25mm.