In cultured pearls, a mother-of-pearl bead or a piece of tissue is inserted (by man) into the mollusk to start the process. For both, the quality of the nacre dictates the quality of the luster, or shine of the pearl, which is very important to its beauty and its value.
For an airplane pilot, education takes many forms, including applied instruction, a high school diploma, an associate's or bachelor's degree, and specialized training. The Federal Aviation Administration also requires pilots to accumulate a lot of real-world knowledge in the form of flight-hours.
Degrees in Aviation, Aviation Management, or similar fields. FYI - There IS a requirement to have at least 1,000 hours pilot-in-command time in jet aircraft to qualify as a Astronaut Candidate Pilot. Flight test experience is highly desirable. Basic Qualifications - Astronaut Candidate.