Here is the official replica of Bellatrix Lestrange's dagger, we see this dagger appear in the first part of Harry Potter and the Deathly Hallows. Bellatrix is ??certainly one of the most loyal Death Eaters to Voldemort and distinguishes himself from the others notably by the assassination of characters close to Harry. This collector's item is delivered in a collector's box lined with a magnificent red velvet to present and protect it.
Reference : NN7555