9ct Hallmarked Gold Necklace with Gold & CZ Pendant

Excellent condition as shown

Chain measures approx. 40cm in length and weighs approx. 0.41g

The pendant is made of what I think is 14ct gold and has a cz stone (or might be a diamond?)
Looks to be a hallmark on the inside of the clasp but it is hard to see, I think it says "14ct"

Pendant measures approx. 10mm x 6mm
(stone 5mm x 5mm)