Which characteristic is typically associated with full-drilled cultured pearls?

Full-drilled cultured pearls are characterized by having a hole that runs all the way through the pearl. This design allows for greater versatility in stringing the pearls for necklaces or other jewelry applications, providing a secure fit. The drilling process typically creates a channel that maintains the structural integrity of the pearl while enabling effective use in various settings.

Other features of cultured pearls may differ based on the method of cultivation and the specific type of pearl, but the defining characteristic of full-drilled cultured pearls is indeed the complete passage of the drilled hole. This aspect distinguishes them from other types of gems and pearls, which may not always exhibit such thorough drilling.

While the irregular shape or size variations of cultured pearls can be considered, they do not directly define the full-drilled aspect. The surface polish may also vary depending on the quality of the pearl's nacre, but again, this is not specifically indicative of being full-drilled. Therefore, the presence of a hole that extends through the entire pearl is the key characteristic associated with full-drilled cultured pearls.