Strong's #3135: margarites (pronounced mar-gar-ee'-tace)
 from margaros (a pearl-oyster); a pearl:--pearl.
Thayer's Greek Lexicon:
 ́ 
 
  margaritēs 
 
 1) a pearl
 2) a proverb, i.e. a word of great value
 
  Part of Speech: noun masculine
Relation: from margaros (a pearl-oyster)
  Citing in TDNT: 4:472, 564
 
Usage:
This word is used 9 times:
Matthew 7:6: "neither cast ye your  pearls before swine, lest they trample"
Matthew 13:45: "man, seeking goodly  pearls:"
Matthew 13:46: "Who, when he had found one  pearl of great price, went and sold all"
1 Timothy 2:9: "or gold, or  pearls, or costly array."
Revelation 17:4: "precious stones and  pearls, having a golden cup in"
Revelation 18:12: "precious stones, and  of pearls, and fine linen, and purple,"
Revelation 18:16: "precious stones, and  pearls!"
Revelation 21:21: "twelve gates were twelve  pearls; every several gate"
Revelation 21:21: "every several gate was of one  pearl: and the"