DAMAGED Cameo Brooch diamond cut surround Early 20th Century? Small(3cm) Brass?

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DAMAGED Cameo Brooch diamond cut surround Early 20th Century? Small(3cm) Brass? :
$3.67

***DAMAGED***Dusky Greyish- blue coloured Cameo(does not appear to be shell)3cm
Diamond Cut Surround(POSSIBLY BRASS)***METAL IS BENT ON BOTTOM RIGHT QUARTER
Pin catch & style look like early 20th century,perhaps Victorian
***PIN IS DETACHED
Pictures with red background show brooch before it was damaged
I am unable to find anything like it to any number of items from me and pay postage for only one of them...ANDif you buy 2 or more items worth a total of at least £10 you will receive aFREE GIFT! ☺