London blue topaz is 8mm across.
Pendant setting is 10.5mm across.
Photograph 4 is the same necklace set with white topaz and is just to show scale.
Available with 16″ or 18″ chain, just let me know which you would prefer when you place your order.
Your necklace will come in a black gift box with a black bow.
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All jewellery is hand made at my studio in Cornwall, south-west England.