# Collision
The **Collision** command automatically detects if any gemstones in the design are overlapping or intersecting.
When the **Collision** icon is clicked, the system scans all the gemstones in the model and selects those that:
* Are **overlapping**, meaning they occupy the same physical space or are placed too close together to be properly set.
* Are in **collision**, meaning their geometries are intersecting, which could lead to issues during manufacturing or stone setting.
This command is especially useful for quickly reviewing the final design before creating renderings, prototypes, or production files, ensuring that all stones are correctly placed without interference.
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**Goldsmith's Tip**: In tightly packed pavé or multi-stone designs, using **Collision** helps prevent common mistakes that might only become evident during printing or assembly.
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