Diamond Open Access is a model of scholarly publishing that does not charge author fees (APC - Article Processing Charges). Also known as sponsored or platinum OA. Since journals do not charge either readers or authors directly, such publishers often require funding from external sources such as the sale of advertisements, academic institutions, learned societies, philanthropists or government grants.
In effect, this is a ‘publisher-pays’ model and is usually offered by university presses where the costs of publication are subsumed within existing budgets and regarded as part of the mission of a university.
