Construction will now start at the Global Innovation Centre at Harwell which is due to be completed by spring 2013.
Element Six synthetic diamonds are used in applications such as cutting, grinding, drilling, shearing and polishing.
Bowmer & Kirkland will build a £20m research and development centre for synthetic diamond specialist Element Six near Oxford.
Construction will now start at the Global Innovation Centre at Harwell which is due to be completed by spring 2013.
Element Six synthetic diamonds are used in applications such as cutting, grinding, drilling, shearing and polishing.