Aetheric Chronometer

a beautifully crafted pocket watch, its casing adorned with arcane symbols and delicate engravings that tell tales of ancient magic. The watch face is protected by a crystal clear, unbreakable glass, beneath which the hands move in a seemingly erratic pattern, only aligning to the correct time when held by its attuned owner. At the heart of the watch’s design is a small, specialized compartment designed to house a single gemstone.

• Gemstone Activation: Inserting a gemstone into the watch is an action that requires the user to open the compartment and place the gem inside. Once a gem is placed, its magic is activated, and the effect lasts for 24 hours. Only one gemstone can be active at a time.
• Changing Gems: Changing gemstones is an action. Removing a gemstone before the end of the 24-hour period immediately ends its effects. 
• The Gemstone is Consumed once it is used in the Chronometer. If it is pulled before the 24 hours is up the Gemstone is still consumed.  

Notes: Gem Effects:  Obsidian:  Grants wearer Nondetection (Other Gem effects made at GM discretion on the spot or ahead of time) , To attune to the Aetheric Chronometer, a user must spend a short rest concentrating on the device, allowing its magic to synchronize with their arcane signature.