These were from a very old seamstress friend of my mother.  Given to me by her in the mid 70s. They are approximately 60 years old. They have been stored in a glass jar.  Measuring 5/16" long by 3/16" wide, tear drop shape.  Very old.  Faceted, silver backed like a mirror foil flatback.  In fair shape.  Check out photos.  Weighs 96.3 grams.