“We’re both innately solvers,” Michael Ventura, the founder and CEO of the strategy and design practice Sub Rosa, says of himself and his wife Caroline, the jewelry designer of Brvtvs. He’s speaking of their traits, both at work — Sub Rosa specializes in elegant and efficient business solutions while Brvtvs counters the jeweled cacophony with restrained pieces — and at home — which shares an address with their new store, and abuts their individual businesses.