The story
Founded by Dean Zelinsky.1
On August 26, 2008, Dean Zelinsky announced the launch of his new company, DBZ Guitars, in partnership with Diamond Amplification owner Jeff Diamant, and Diamant's Texas partner, Terry Martin.
On January 9, 2009, DBZ Guitars' founders announced the official launch of their debut website in order to premier their new electric and acoustic guitar models.
Rumors about Zelinsky leaving the DBZ Guitars company began circulating in January 2012. On February 9, 2012, a lawsuit was filed by DBZ Guitars against Zelinsky for a breach of fiduciary duties.
On April 19, 2012, it was reported that Zelinsky was founding a new company, "Dean Zelinsky Private Label Guitars", further signaling his shift away from the DBZ company.
At some point between Zelinsky's departure in 2012 and the following NAMM show in 2013, the company was rebranded to DBZ/Diamond. This shift in branding coincided with new headstock designs and models.
By December 2014, the company dropped DBZ from their branding and began going solely by the Diamond moniker.
From Wikipedia’s article on Diamond Guitars, shared under CC BY-SA 4.0.4