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not a good idea to finish with a diamond stone it will leave a toothy edge you can get a black ark for around 30 bucks or a spyderco ultra fine ceramic hone that will last a life time for under 50...

i use soft ark after i set the bevel with a fine indian stone to get out the deep scratchs if you want to use ark's for maintaining the black or translucent ark would be a good choice the soft ark...