Harry Potter Slytherin Crest Necklace Slytherin Charm on a silver plated necklace The Crest of the famous house, founded by Salazar Slytherin This charm has been created using a print from the Warner Bros style guide. It is approx 15 mm x 20 mm. The Necklace is a silver plated trace chain which is 16 inches in length with a 2.5 inch extender chain This charm comes on the Harry Potter branded card packaging and shows the Warner Bros logo on the reverse.