By Rajendra Jadhav, Polina Devitt and Clara Denina MUMBAI/LONDON (Reuters) -India, home to 90% of the world’s diamond cutting and polishing industry, and De Beers, the top global rough diamonds producer by value, are seeking clarity and flexibility from G7 countries in implementing a ban on imports of Russian gems. The Group of Seven countries on Wednesday announced a direct ban on Russian diamonds starting Jan. 1 followed by phased-in restrictions on indirect imports of Russian gems from around March 1. Russia is the world’s biggest producer of rough diamonds by volume with a 30% share of the…