Vintage Scottish Celtic citrine and silver shield brooch.  It has a pin and C clasp closure and is marked "SILVER"  on the rear. The brooch measures approximately 4.4 cm in diameter. Weight is 19 grams. It is in very good condition. Estimated to date from 1920's to 1940's 
 

Condition: Very good 
Colour:Silver
Metal: Sterling Silver
Size: 4.4 cm diameter approximately
Era: Estimated 1920's to 1940's