It is 7 1/2" long by 1 3/16" wide by 1/4" tall.
I can say with certainty that this is indeed a rare find. It is not signed. It is circa 1940.
Each full bloom rose has centers of white pave rhinestones on top.
There is no enamel loss, no missing rhinestones, and no dead rhinestones. It is just an incredibly fabulous bracelet.
Anything made by DeRosa is striking in design with high quality enamel work. The floral pieces are especially good, particularly those in the retro style of Hollywood precious jeweler Paul Flato.
In 1973, and again in 1974, the company showed full color ads of their "Artist’s Series". These have no rhinestones, but feature geometric and abstract designs in enamel. According to Harrice Miller’s books (especially her second edition) some of the artists providing inspiration were: Braque, Miro, Chargill, Calder, Vesarely, Picasso and Pucci.
Sometimes this jewelry was made in sets including bracelets, pendants, pins, earrings, and rings. The color combinations were blue, turquoise, and green, also tan, orange, and brown, plus other variations. Some are solid brick red with black lines; others look as if the painted design was an oriental word. The enamel completely covered the metal. One of the ads states that it was baked 27 times!
Dimensions bracelet: Inner Circumference 2 1/8" x 2 1/16th"
Dimensions earrings: 1" diameter
Dimensions: 4" x 2"
This fleur de lis has an enamel center over brass and is used separately as a pin or as a watch holder. It is 1 1/4" x 1" .
Size: 1 7/8" x 2 1/2"
It looks very much like Trifari's 1960 version from the L'Orient Collection. Hallmark: NOT SIGNED!!
Reference: Brunialti, American Costume Jewelry- Art and Industry ( 2008) V2, p 57
It is pre 1942.