Most people refer to 'vintage' jewelry as pieces that are between 50 and 100 years old.

Estate jewelry is a term used to describe previously owned jewelry. This jewelry is usually acquired from estates or jewelry that has been sold and is often antique or vintage in nature. Antique jewelry is jewelry that is 100 years old or older, while the term “vintage” includes many decades or eras. 

Upcycling represents a variety of processes by which “old” products get to be modified and get a second life as they're turned into a “new” product.