Dr Simon Thurley, chief executive, said its loss “would not just be a blow for Birmingham but for the world”.
He explained: “We now need to secure its long term future both as a business and as somewhere people can learn about the source of goods with which Birmingham supplied the Empire.”
The Jewellery Quarter has a network of 19th and early 20th Century terraces with workshops built in the back gardens.
The JW Evans building was described as “unique as the most complete repository of the traditional craft skills, industrial processes, tools, machinery and archive materials that epitomise this important facet of our industrial past”.
The city council said English Heritage’s commitment builds upon “great work” already under way to preserve and enhance the area.
Birmingham Conservation Trust has been working on finding the best route forward for the remarkable buildings and the history they hold. This is complex problem to unravel but it’s great news to know that JW Evans is secured.