What is a half-drilled cultured pearl used for?

A half-drilled cultured pearl is specifically designed to allow for mounting on a post, such as in earrings. This type of pearl has a small hole drilled partway through its surface, which makes it easier to attach a post or other findings, like a bail or connector, without the need for cutting through the entire pearl. This technique preserves the integrity of the pearl while also providing a secure base for setting.

The choice that focuses on creating a necklace without additional modifications does not accurately describe the purpose of a half-drilled pearl, as these pearls typically require additional components for proper assembly. Preventing water absorption also does not relate to the structure or use of half-drilled cultured pearls, as this characteristic is more pertinent to the maintenance of the pearl rather than its functional design. Lastly, while half-drilled cultured pearls can be used in jewelry, their primary function is not solely decorative art, but rather to facilitate practical jewelry assembly, particularly in items requiring a secure post-attachment.