Answer: PEARL

AnswerCrossword Clue
PEARLBuck of books
PEARL30th anniversary gift
PEARLFind in an oyster
PEARLSteinbeck opus, with "The"
PEARLOyster's gem
PEARLWisdom unit?
PEARLGift from an oyster
PEARLOyster bead
PEARLThirtieth-anniversary gift
PEARLOyster gem
PEARLRock's "... Jam"
PEARLJune birthstone
PEARLRock's ... Jam
PEARLTreasure in an oyster
PEARLMinnie of "Hee Haw"
PEARLOyster formation
PEARL... Harbor
PEARLOyster's creation
PEARLJanis Joplin's nickname
PEARLOnly gem made by an animal
pearlfemale given name
PEARL"The Scarlet Letter" daughter
PEARLOyster's output
PEARLCultured gem
PEARLOyster find
PEARLOne of a strand
PEARLGem with a "mother"
PEARLHester Prynne's girl
PEARLItem case ...
PEARLShade of gray
PEARLLustrous bead
PEARLHee Haw's Minnie
PEARLEarring inset
PEARLDived-for item
PEARLHester Prynne's daughter
PEARLBit of wisdom
PEARLHester's willful child
PEARLDiving find
PEARLGem on a strand
PEARLNecklace gem