Vintage Osmena Pearl and Sterling Earrings

Oh my! There are not enough synonyms for exquisite in the English language to describe these vintage Osmena pearl and sterling silver pierced earrings. The luminous colors of the Osmena pearls seem to change when observed from different angles with hues of pink, blue and purple. These are absolutely bewitching! The earrings and the extra-large butterfly backings are all stamped sterling. One of the earrings appears to be signed, however, the artist is unknown to me (see close up picture). The approximate dimensions are 3/4 inches long and 5/8 inches wide with a total weight of 6.61 grams. These earrings are in excellent preowned vintage condition.