Agats and Metal Necklace

Necklace of 50 cm made up of Agates of various colors on Silver plated Metal.
The name of Agate comes from a river of Sicily, the achates.
The Agate is a ribboned and sometimes crossed Chalcedony opal. The Agates are in nodules or géodes whose size varies between a few millimetres and several meters of circumference. Hardness on the MOHS scale of hardness: 6.5-7. Density: 2.6-2.65.