12ct Gold Filled Measures 60mm Features a post that slides easily through the back of the hoop for an endless hoop design Wear alone or add a charm, drop, or dangle for an enhanced design This 12ct gold filled endless hoop earring is a classic earring design which can be worn alone or with drops or dangles for a more dramatic look. 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. Unlike gold plated metal, gold filled can be soldered using 9ct gold easy solder. To close the hoop, slide the post through the hole in the back of the hoop behind your ear.