These are 7-8mm AA graded button pearls which are very round in shape with a relatively flat backside., The half-drilled button pearls are often used
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Tahitian Pearl - 2pcs Green & Purple ER874
8mm Mabe Shaped Southsea Shell Pearls in White or Black Half-drilled
Classical 3-row 7-8mm AAA Gem Quality Round Pearl Necklace 14k
Double 6-8mm Drop Pearl Brooch 18K Gold Plated
9-10mm White or Chocolate Rice or Oval Shaped Pearls Strand - Canada
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Tahitian Single Pearl - 1pcs Yellow Gold LP553
Mauve or Grey Colored Center Drilled Biwa Loose Pearl Strand
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10mm Southsea Shell Pearl Strands 2mm Holes