When I saw this 17th Century portrait of La Marchesa Sacchetti (by Jacob Voet, 1670-1680, at the Pallazo Chigi, Rome) I KNEW I had to have her earrings!  I love the combination of her Black and White earrings! 

These teardrops in these earrings are made with beautiful Shell Pearls, which are beads made of the nacre of oyster shells giving them the luster and weight of real Pearls without the high prices!  The top black pearl is made of glass and has a nice quality sheen to it. 

Available as a hoop (shown), leverback, or clip on. 

The first image is from Patterns of Fashion 5 by the School of Historical Dress: