0.74cttw 18kt White Gold Wedding Ring Set Waiting for a Center Diamond. This is a Gorgeous baguette and round diamond wedding set. It is pictured with a CZ as the center and it will need to be replaced by a 6.4mm round diamond cut stone. This would approximatley a 1.00ct Diamond. Please visit our retail location to pick out the center stone. We have many 6.4mm options in stock.