The vast majority of vintage, and especially antique (pre-1930) costume jewelry is unsigned.
If you collect only signed jewelry, you will miss way too many highly collectible items.
The key to investing in or collecting vintage jewelry is not always signature, but quality, condition, and how the design reflects the history of it's era.
One of the most fun jewelry collecting categories would be unsigned Weiss.
Also, on early pieces by Coro, marks were often very faint, and sometimes these marks rub off.
Many manufacturers or design houses, like Coro, signed only one piece from a set of costume jewelry.
Number 4 Cross pendant: This kitsch looking item is decorated with glass tiles and is properly known as micro mosaic jewellery, a distinct looking type of jewelry which has been made in Italy for hundreds of years.
This Italian religious pendant is modern and dates from the year 2000 – it was made to commemorate Christs 2000th birthday and is dated on the back.