Dating your vintage costume jewelry is all about being a good detective. Here are some quick tips to get you started.
 Vintage Advertising and Magazines
Old magazines are full of vintage jewelry advertisements. These advertisements are a great way to tell the age of your jewelry as all magazines are dated. You can search old archives for magazines. 
1956 Jewelry Magazine Ad - Renoir
Patents
Some pieces of jewelry bear a registered patent number which can be researched to determine the registration date.
Google's has a new tool called "Google Patents" which contains a searchable data base of all US patents registered from 1790 to 2006.
Copyrights
The copyright symbol on a piece of jewelry indicates a date of 1956 or later. In 1956 it became much more cost effective to register a design Copyright which led designers to abandoned the expensive patent registration process.
Designer and Makers Marks Knowing how a piece was signed or marked by a designer or manufacturer during specific years may help you date a signed piece of vintage costume jewelry.
eg.: Gustave Sherman, renown Canadian jewelry designer, used an oval nameplate in the 1950s to mark his jewelry, but switched to a square cartouche in the
1960s.
Styles
Not all jewelry will be marked. Knowing what styles were popular throughout the years will then be most helpful. Jewelry styles have changed in accordance with changes in clothing and hairstyles.
1920's -1930's - long necklaces, cocktail rings, tennis bracelets in bold angular designs
1940's - sophisticated and large Hollywood style bows and floral motifs , patriotic wartime jewelry
1950's - very co-ordinated faux pearl, beaded and rhinestone necklace and earring sets, absract modernist designs
Revival Jewelry
Revival pieces are often a
re-interpretaion of a style from an earlier period and the trained and eye will detect the
difference. One must learn to identify the revival period
pieces from original period pieces.
Egyptian
The excavation of Egyptian tombs in the 1870's inspired an extreme fascination with Egyptian symbols. This fascination inspired the creation of "Egyptian Revival" jewelry which featured sphinxes, scarab beetles and other Egyptian designs.
The style was "revived"
in the '20's and '30's after the unearthing of King Tutankahmen's tomb
and again in the '50's after Elizabeth Taylor's portrayal of Cleopatra
and yet again in the '70's during the King Tutankahmen's world tour.
Victorian
Victorian revival pieces became popular in the 1930's and again in the
'50's. While similar in design, these revival pieces lack the
detailed craftsmanship of original period pieces.
Vintage and Antique Jewelry Research Information
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