What are golden beans in coffee?

Golden beans - sometimes called golden tips or golden kernels - are underdeveloped seeds with a pale yellow or slightly translucent appearance, found most commonly in dry-processed coffees from Yemen and Ethiopia. They're counted as a secondary defect on the SCA green grading scale.

They develop when one of the two seeds inside a cherry doesn't fully mature before drying - typically due to incomplete fertilisation or adverse conditions during cherry development. The result lacks the density and cellular development of a normally formed bean.

In small quantities, golden beans are a characteristic of certain origins rather than a serious problem. Traditional Yemeni naturals and some Ethiopian dry-processed lots contain them as part of the style. At higher concentrations, they indicate a quality issue - roasting unevenly, developing less than surrounding beans, and contributing a bland or papery note similar to a quaker. If you're seeing many on a green assessment, it's worth flagging before committing to the lot.