Hippocrates wrote that silver had beneficial healing and anti disease properties. The expression 'born with a silver spoon in their mouth' stems from health rather than wealth status, as children fed with silver utensils were believed to be healthier.
Early necklaces were made of mollusc, bone, shells, small stones, claws and animal teeth gathered from successful hunting trips and date back to the Stone Age 40,000 years ago.
They then moved on to wearing strings of shellfish around their necks (I think I prefer the thought of teeth)
The earliest examples of gold used in necklaces dates back to 2500bc and were found in Royal graves. After the fall of Rome necklaces were seldom worn until the 14th century.
Beads were introduced into necklaces as a form or barter with other traders. The Native Americans discovered mixing Turquoise with Sterling Silver, and for that we thank them!