Holland Jachtbouw Launches J-Class Yacht "Topaz" Dutch builder Holland Jachtbouw has launched their latest creation. She is called "Topaz", the J-Class yacht previously referred to as 'J8'. Launched and in the water already with her rig stepped, Topaz is anticipated to soon start sea trials. The yacht boasts exterior design by Hoek Naval Architects also Naval Architecture is by the same firm. The interior though, is created by Rhoades Young Design. The all aluminium yacht was initially built at Bloemsma and then transferred to Holland Jachtbouw for finishing.