Related Clues:

• "The Good Earth" novelist Buck
• Sea gem
• It's a gem of a conference, perhaps with fifty in attendance
• Fine example
• Fake or real pearl, often
• "Cultured" gem
• Oyster's offering
• It looks as though the frost has got this bulb
• You may draw it with a gun
• Pearl-necklace piece
• Lustrous structure in an oyster-shell
• Diving find
• Nugget of wisdom
• Lustrous structure in a mollusc shell
• Bead on a necklace