Many buyers want dates for their vintage jewelry and sometimes dating a piece can be difficult.   There are many clues to dating vintage jewelry and here is one.  Aurora borealis jewelry (see pictures below of examples) are pieces that are coated with a film that is stunningly beautiful and changes color with your every slight movement.  They are some of my favorite pieces.

They are however not found on pieces (as sometimes seen on listings) of  1940's or 1920's or anytime around there. I've read several articles and information on aurora borealis and dates can vary slightly, though it comes down to the fact that aurora borealis process was developed in the mid 1950's.  If dating a piece to a specific year is an issue then you'll have to sort through the different articles on it to find your exact year and go with your own gut instinct, but for most collectors this is not an issue. 

When dating a piece of jewelry with aurora borealis rhinestones, or crystals, figure the piece to be mid 1950's or newer.  And yes, aurora borealis rhinestones are quite common on "new" pieces of jewelry.

Here are some common pieces of jewelry that aurora borealis rhinestones are found on.

Pink aurora borealis crystals (some of my favorites)

Aurora borealis rhinestone necklace.  Notice the beautiful colors. 

 More common clear faceted aurora borealis crystal necklace.