Businesses face more challenges today but can overcome them by reacting smartly while sticking to their core values, management guru Jim Collins told American Gem Society attendees in the keynote address for the group's recent conclave in Denver. The session was sponsored by Jewelers' Mutual Insurance, Neenah, Wis. Jewelers' Mutual president Darrin Kath introduced Collins to the audience, adding that his books were a personal inspiration in his own career. Collins, author of the book Good to Great, told the audience that companies in the same set of circumstances often get different results. “We live in an increasingly turbulent and disruptive world,” he said. “Our environment is much less forgiving. Your outcome has to do with how you manage yourself, not with what the world does to you. “Disruptions and storms and outside events mean nothing in terms of who becomes great