The rarity of Crown of the Silken Queen is Mythical. At this moment the item is available for trade.
Crown of the Silken Queen is a skin for Broodmother. The skin was added to the game on July 19, 2018, it was created by blossomalex.
Crown of the Silken Queen is currently one of the most popular skins, but it is rarely seen in the game due to its high price.