Simply put, mechanical jewelry is jewelry that moves. In some cases, flower petals are hinged so that they open. In some cases, tiny springs allow parts to tremble, such as the wings on a bird brooch. In all cases it is wonderful and innovative jewelry.
 

   CORO pink enameled floral Duette marked "Coro Duette, Pat'n 1798867" and is 3-5/8" by 2-1/3", similar to the Day & Night set. Patent issued to Adolph Katz in 1939. In this case, the brooch becomes two clips, and the flower centers revolve.   View    #C13105

 CORO unsigned  "Day and Night" pieces. The earrings are 1-1/8" and the bracelet is 7" by 1-1/4".  "Day and Night" unsigned bracelet. Each flower on these pieces opens and closes. They are enameled on both sides, and the underneath each are round glass beads and rhinestones.   View   View   View  They are beautifully enameled, and the flower petals move to open and close the flower. (Seen in Christie Romero's "Warman's Jewelry, 3rd Ed, page 188.)   View  View   View   View

   CORO unsigned Blue set  day and night style, circa 1940. The necklace is 16-1/4" and 6-1/2" by 1-1/3" (front width), the pin on the top left is 3-1/4" and the clip is 2-1/2".  View    #C14732

   COROCRAFT day and night blue cabochon and pave floral 4" brooch.    The petals on the central flower OPEN and CLOSE around the center blue cabochon. giving the brooch a different look. The MECHANISM that allows this is amazingly complex.  View  View   #C20223

   CORO Day and Night brooch with brown enameling on gold tone and clear rhinestones. ONe-half of each flower opens and closes to reveal the beaded petals underneath.   View   View   View   #C20355

   ROSENSTEIN sterling and enameled 2-3/4" flying fish fur clip with green rhinestone eyes. Each of the large fins flips as though this fish could swim!  View  #X24351

     HOBE pink and yellow unfoiled rhinestones set in gold tone filigree leaf brooch with flower trembler, 2-1/2" by 1-3/4".  View   View   #O31114

    ROSENSTEIN gold tone, clear rhinestones and artificial pearl 2" flower trembler necklace, 15".  View   #X25989

 ROSENSTEIN gold plated base metal with clear rhinestones apple trembler brooch, 2".   View   #X28533

  ENAMELED blue, yellow and red 3" bird trembler brooch circa 1940. Springs allow the wings to tremble.   View   View   #Y24418

    WHITE and black enameled  swan brooch with hinged wing, 2-1/3".  The wing opens to about 45 degrees on a hinge. View   View   #Y24340

    MOSELL wind up music box mechanical organ grinder's monkey brooch.  View   View
Courtesy of Harrice Miller

  DeNICOLA bug pin with moveable wings, 1-1/2".   View   View   #X5115

   IRADJ MOINI huge unsigned blue and green rhinestone pin with hinged double wing, 4-1/4".   View   View   #K21875

CARNEGIE trembler winged insect pin  View    View  #C20279

CARNEGIE smoke and clear rhinestones trembler necklace.   View   View   View   View   View   View  #C17851    

     CLEAR rhinestone flowers trembler 14-1/2" by 1-1/4" necklace, 7" by 7/8" bracelet and 7/8" earrings. See a matching brooch in Moro's "European Jewelry" page 25.  View   View   View   #27679

   TREMBLER "Zulu" circa 1940. Shown in Brunialti's "American Costume Jewelry" on page 236.     View   #Y27756