1 /5 Peter La: What a joke, I took 2 necklaces into the store. 1 silver one to extend a 18 k white gold one.
The jeweller told me it was costume jewellery, I had informed him, one was 18 k white gold and the other was silver.
After inspection he saw the hallmark of 750 for the gold.
If this is your profession you should know your product.
Do no ever devalue your clients jewellery without first looking into the clients authenticity.
I think you are in the wrong profession.