Gentle vibration can sometimes help loosen minor tangles.

Place the knotted necklace on a hard, smooth surface (like a small plastic lid or plate).
Place the surface on top of a mildly vibrating object, such as the top of a running washing machine or gently against an electric toothbrush handle.
The vibrations may help the knot loosen itself slightly over several minutes.
If loosened, proceed with fingers or pins to fully untangle.
This is less effective for tight or complex knots.

N/A - A hands-off approach that might work for very small, simple knots.

Vibration Method (Small Knots)