Glassblower's Bauble is a type of currency in Path of Exile, which is used to upgrade rare items. It can be obtained by trading in Divination Cards, or by completing certain in-game tasks such as daily missions or challenges. The Glassblower's Bauble can also be bought from other players or from the official shop.

Once obtained, the Glassblower's Bauble can be used to upgrade any rare item with an item level of at least 80 to an item level of 84. This will make it more valuable and potentially more powerful. The cost of upgrading an item varies depending on the item's base item level and the number of upgrades desired.

The cost of using the Glassblower's Bauble is one of the most important factors when deciding whether or not to upgrade an item. The cost can range from a few hundred to several thousand per upgrade, depending on the item and the number of upgrades desired.

Once an item has been upgraded, the Glassblower's Bauble is consumed and can no longer be used. Therefore, it is important to think carefully before investing in upgrades.