Cinder Shard

You can feel a warm glow from within this stone.
Overview
Cinder Shard is a late-game resource found in the Volcano Dungeon on Ginger Island. It is primarily associated with the Forge on the tenth floor, where it becomes one of the most important materials for improving equipment. Beyond forging, it also has a handful of island-specific uses in trading, tailoring, dyeing, and a 
In the Forge, Cinder Shards are used to combine rings, enchant tools, and forge melee weapons with gemstones. The standard cost is 20 Cinder Shards for combining two rings, applying a random enchantment to a tool or weapon, or adding a 
Cinder Shards can also be traded for special goods and recipes rather than purchased with gold. They are accepted by the Island Trader and the 

They have a few other uses outside of forging and trading:
- In tailoring, Cinder Shards are used on the
Sewing Machine spool to create a clothing item.
- They can be used in dyeing as an orange dye at the dye pots in
Emily and
Haley’s house.
Stingray can request 7 Cinder Shards in a Fish Pond quest to raise the pond’s capacity from 3 to 5.
- Cinder Shard is not used in any bundles.
Because many of its uses are tied to Ginger Island progression, Cinder Shards are most valuable once the player has access to the island and can reliably clear the Volcano Dungeon. Players aiming to maximize their forge options, complete fish pond requests, or buy island-exclusive trades should hold onto them rather than selling them off.
Official description
You can feel a warm glow from within this stone.