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It would be worth weighing the 18ct ring because then you could know the intrinsic gold value. Allow about £30 per gramme for the gold. Let me know the weight. Obviously it is worth more though for the diamonds and workmanship. It looks quite heavy. The setting of the stones is a modern style that will not appeal to everyone and the diamonds are quite small. The 9ct and CZ ring is probably worth £100/120.
Get back with your answer on the 18ct one. Greg
The 18ct is not English, looks a bit Russian and it may be difficult to establish the maker. Foreign listed goldsmiths can be hard to trace.