Dates to the late Belle Epoque, Edwardian era, circa 1910.
Crafted in solid 14K yellow gold, and hallmarked as such upon the clasp. Also bears a maker's mark of Theberath & Company of Newark, New Jersey. (An amethyst & seed pearl lavaliere & matching chain by this company was listed at the Sotheby's September 2014 auction for the estimated price of $8000 to $12000.)
The quality and beauty of this piece is evident from the get-go. The forget-me-not flowers are truly superior to most of the gold work I have seen to date. It is bezel-set in the center with a soft golden yellow oval-cut citrine that measures approximately 15 mm by 7.25 mm, with an estimated weight of over 3 carats. Embellished on either side with two post-set genuine baroque seed pearls.
The back of the brooch has the original top locking clasp and pin, which work perfectly.
The brooch measures 1.54" from side to side, and 0.82" from top to bottom. It weighs 5 grams.
Condition is very good, with no damages or repairs.