There are currently 1 Diane Johnson Design yachts afloat as of today. The longest yacht designed by Diane Johnson Design is Invictus, measuring 65.5m. She was built in 2013 by Delta Marine. The largest yacht designed by Diane Johnson Design is Invictus, built by Delta Marine in 2013, with a volume of 1943 GT. On average yachts designed by Diane Johnson Design are 66m with a volume of 1943 GT. Last year there was a total of 0 yachts designed by Diane Johnson Design built.