Jim Brusilovsky puts the diamonds right where you can see ’em: onlineUnlike many of his contemporaries, fine ­jewelry retailer Jim Brusilovsky isn’t intimidated by the tide-shifting prowess of the Blue Niles of the world. “Having a human being is important” when selling diamonds, asserts the owner of Pennsylvania’s Marks Jewelers, with locations in Levittown  and Montgomeryville. But that doesn’t mean he’s not hustling to compete with the industry’s major e-commerce players. Brusilovsky recently souped up his company’s website by integrating an online search tool, Diamo