"This piece is from the 1930's and most likely were premiums at tourist areas like fairs. This one is specialized for Sandra. It's made of iridescent white Mother of pearl in the shape of a heart with the original curb chain. This information I got from my book title \"Brilliant Rhinestones Vintage & Contemporary Jewelry\" from the Ronna Lee Collection page 73.  The majority of them had \"MOTHER\" in cursive. This one came from my collection which I've had for decades. It will arrive in a gift b Collectible Heirloom Necklace For Valentine's Day, Collectible Heart-shaped Hallmarked Jewelry, Vintage Necklaces For Valentine's Day Memorial, Vintage Necklace For Valentine's Day Memorial, Engraved Jewelry Collectible For Valentine's Day, Personalized Heart Jewelry Collectible, Personalized Heart Jewelry For Collectors, Vintage Nameplate Necklaces, Victorian Personalized Jewelry For Valentine's Day