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Georg Jensen sterling "Tulip" brooch, set with a cabochon-cut synthetic (laboratory grown) blue sapphire
 
In the 1920's, when this piece was designed, laboratory grown sapphires were a recently innovation, and prized for the fine color and quality in which they could be grown.
 
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1-3/4  x 1- 5/8”
 
(the large size version)
 
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Reverse, with hallmarks
 
and good original mid-century hinge, pin and safety lock
 
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