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There are several tests in determining Authentic Antique and Vintage Bakelite Jewelry using Formula 409, Hot Water, Simichrome Polish and a Q-Tip.
Still, some Bakelite such as Black Bakelite may not test positive.
Marcasites which were substituted for diamonds as early as the 1700s, regained it's popularity in the 1920s and 1930s.
A higher valued marcasite piece would have better workmanship where each marcasite would be set with tiny prongs or beads versus glued in ones and because of this the stones will stay in place longer.
If you see a marking such as "1/20 12K on Sterling" then 1/5 of the piece is 12K gold and is likely to be from 1942 to 1945.
Vintage Bakelite which is a Polymeric Plastic invented by Leo Hendrik Baekeland in 1907, became popular in jewelry design during the hardships of World War II also.
Many clasps on old jewelry such as pins broke in time so replacement ones were soldered onto the back.
Remember that there are always exceptions to the rules since the "C" clasp was also used later on in Europe so take every detail into account to come to your full conclusion.You'll be amazed at what you could find and where you will find it.Suddenly a piece of jewelry that you thought was newer or made of silver plate or gold plate now may be seen in a different light as genuine antique silver or gold with another store of value!This is also true for Rhinestones in Vintage Costume Jewelry, where prong set ones are valued higher than glued in ones.These are just some of the many date and value tips to help you learn what to look for when buying Antique and Vintage Jewelry which can be as much fun as wearing and collecting it! To learn more date and value tips and how to invest in Antique and Vintage Jewelry & Collectibles from the Victorian Era into the 1960s, check out Sharon's shop at Rubylane - YEARS AFTER Shop.
Look at the hinge and the clasp of a brooch, bracelet, necklace, etc..