This is such a sweet, charming little piece! It truly celebrates the seed pearl, so popular during this era. We believe this pendant/pin dates from the 1870's.
We love the detail, even the 2 little seed pearls on the bale! The bale folds in to be unseen when you wear it as a brooch. Note that the hinge, pin, and clasp have been replaced sometime in the 20th century.
The seed pearls are set in a floral pattern of 10K gold (tested). There is an illegible hallmark on the back.
It measures one inch in diameter, and weighs 2.2 pennyweights.