Silver and gold blue topaz earring and selling ring set

This earring and pendant set was an unwanted gift that a client has asked to sell for me.
They're made from silver and gold and set with pear-shaped Swiss Blue topaz and cubic zirconia.
The sweep of gold that borders each element appears to be solid as it's coloured underneath as well. There's a possibility that it's gold plate but just cunningly applied so that it appears solid.
Each element measures 13mm X 9mm and the pear-shaped topaz are 8X5mm.
The pendant is mounted on a fine 16" silver chain but I can find you a longer one if necessary.