1, weighing jewelry, electronic weighing accuracy needs two decimal places.

2. Put a container full of water on the scale and reset the electronic scale to zero. Water needs to be able to completely submerge the jewelry and ensure that the silver ornaments do not contact with the bottom and wall of the cup.

3. Lift the gem with fine iron wire, completely submerged in water, in a suspended state.

4. Calculate the density of jewelry. According to Archimedes principle, the average density of jewelry is equal to the density of water multiplied by the gravity of silver ornaments divided by buoyancy.

Precautions:

Hollow jewelry or jewelry with many small cracks can't be tested, because if water can't enter, the measured volume will be too large.