Chris Wanstrath, known by his handle @defunkt, has shared a tutorial on his blog authored by technicalpickles about using Jeweler, a tool for crafting Ruby gems. The tutorial, titled "Craft the perfect gem with Jeweler," provides guidance on building custom GitHub gems, offering insights and practical tips for developers interested in creating and managing their own Ruby libraries. It serves as a resource for those looking to enhance their skills in gem creation, leveraging Jeweler's capabilities to streamline the process.