Mini bell shaped 'yan' for Chinese calligraphy

My mini bell shaped 'yan' ink stone for Chinese calligraphy, bought in 2012 from Singapore's Bras Basah complex. It's smaller than the palm of my hand. The 'eye' was a natural pattern formed in the river stone. Yes, I do fill this yan with ink when practicing calligraphy. The ink stains washed off very easily within a minute with relatively little water under the tap. haha