This paper reviews research literature on Diamond Open Access (DOA) journals - sometimes also called Platinum Open Access - that was produced after this journal segment started to become a priority in European research policy around 2020. It contextualizes the current science policy debate, critically examines different understandings of DOA, and reviews studies on the role of such journals in scholarly communication. Most existing research consists of quantitative studies focusing on aspects such as the number of DOA journals, their publication output, the diversity of the landscape in terms of subject areas, languages, publishing entities, indexing in major databases, awareness and perception among scholars, cost analyses, as well as insights into the internal operations of DOA journals. The review shows that research on DOA journals is partly influenced by the science policy discourse in at least two ways: first, through the normativity inherent in that discourse, and second, through the temporality of policy-driven research of practical relevance, which leaves important aspects of the phenomenon understudied. Moreover, research on the DOA journal landscape has implications beyond understanding this particular journal segment, as it also challenges established views of the global system of scholarly communication.

翻译：本文综述了2020年前后钻石开放获取（亦称铂金开放获取）期刊成为欧洲研究政策优先领域以来产生的研究文献。文章将当前科学政策讨论置于具体语境中，批判性地审视了对钻石开放获取的不同理解，并回顾了关于此类期刊在学术传播中作用的研究。现有研究大多为定量分析，重点关注钻石开放获取期刊的数量、出版产出、学科领域/语言/出版机构的多样性、主流数据库收录情况、学者认知度与感知、成本分析，以及对其内部运作机制的考察。综述表明，钻石开放获取研究在至少两方面受到科学政策话语的影响：一是该话语内在的规范性，二是政策驱动型实用研究的时效性，这导致该现象的重要维度尚未得到充分研究。此外，对钻石开放获取期刊生态的研究不仅有助于理解这一特定期刊类型，也对既有的全球学术传播体系认知提出了挑战。