Welcome to Diamond Auto Locksmith - the lock and keys locksmiths in Gaithersburg, MD. What distinguishes our 24 Hour Locksmith services is the fact that our technicians use the latest locksmith tools and lock picks which enables Locksmith Gaithersburg to be your home security experts above all the rest. Emergency Locksmith Services in Gaithersburg, Maryland. Call 240-813-9700 for your free estimate of locksmith services for Home, office or Automotive needs. With Locksmith Gaithersburg you are sure to enhance the security of your home.