By Silke Koltrowitz and Mimosa Spencer GENEVA (Reuters) -Cartier and other labels of the Richemont group have stepped down from the Responsible Jewellery Council (RJC) after the industry body failed to cut ties with Russia, executives from the group told reporters at the Watches and Wonders watchmakers industry fair on Wednesday. “It is not part of our Richemont values to be part of an organization in which some members are supporting conflicts and wars,” said Cyrille Vigneron, president and chief executive officer of Cartier. Jewellery maker Pandora PNDORA.CO also said on Wednesday it was cut…