Hard, smooth, lustrous structure found inside a '38 Down' or oyster

Let's find possible answers to "Hard, smooth, lustrous structure found inside a '38 Down' or oyster" crossword clue. First of all, we will look for a few extra hints for this entry: Hard, smooth, lustrous structure found inside a '38 Down' or oyster. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.