I am not a expert and will describe as best I can.
Unique handcrafted artistic studio jewellery necklace 
By.
Polish designer.
Dorota Gulbierz.
Gold plated ceramic mounted in 925 silver. 
Some crazing to the porcelain.
Don't know what the chain is made of 
Adjustable clasp.
Approx.
1.25 inches.  3 cm diameter 
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CAN BE PICKED UP FROM BOROUGHBRIDGE NORTH YORKS YO51 9AX.
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 PLEASE ASK ANY QUESTIONS THROUGH EBAY OR TEL RAY ON 01423 325394. I ALWAYS LEAVE FEEDBACK ONCE I HAVE RECEIVED SAME FROM THE BUYER THIS LETS ME KNOW THE ITEM HAS ARRIVED AND YOU ARE HAPPY WITH IT. IF NOT HAPPY WITH A ITEM PLEASE CONTACT ME BEFORE LEAVING FEEDBACK AND I WILL DO MY BEST TO SORT THINGS OUT. THANK YOU.