It has a magnetic clasp hidden in one of the pearls (shown below) so you can use these necklaces directly.

Item #N3165 - AAA-Grade Ivory Mabe Pearl Necklace
Graded AAA by the vendor, Rare Ivory Mabe Pearl Necklace that are doubledrilled to prevent them from flipping so they sit snugly on your neckline. Looks a lot more expensive . Beads measure 13.5 -16.5 mm. These have a MOP backing and a magnetic clasp. Actual 18" strand shown.
$368 for this strand

Item #N3129 - Turquoise-colored Shell Pearls 10 mm
Shell pearls are a great alternative to the real ones due to their reasonable prices and wide range of colors. This strand is a beautiful clean blue turquoise color, imagine what this would cost if it were real turquoise! Beads measure 10 mm, 16" strands. Last strand.
$12 for 1 strand

Item #N3055 - White Shell Pearls Graduated Rounds
High quality White Shell Pearls Graduated Rounds from 8 mm to 16 mm, 16" strands.
$24 for 1 strand

Item #N3109 - South Sea Shell Pearls 8 mm Rounds
These are Shell Pearls in a South Sea Pearl color mix. Smooth Rounds measuring 8 mm, 16" strands. Color matches with N3119.
$12 for 1 strand
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Item #N3119 - South Sea Shell Pearls Graduated Rounds
These are Shell Pearls in a South Sea Pearl color mix. Graduated Rounds from 8 mm to 16 mm, 16" strands. Color matches with N3109.
$25 for 1 strand

Item #N3136 - White/Pale Pink Shell Pearls 10 mm Rounds
These are Shell Pearls in a white/pale pink color mix. Rounds measuring 10 mm, 16" strands.
$15 for 1 strand

Item #N2526 - Dark Green Keshi Pearls 5-6 mm
Small-sized Dyed Dark Green Keshi pearls measuring 5-6 mm, 16" strands.
$12 for 1 strand

Item #N2516 - Bronze Keshi Pearls 5-6 mm
Small-sized Dyed Bronze Keshi pearls measuring 5-6 mm, 16" strands.
$12 for 1 strand

Item #N2506 - White Keshi Pearls 5-6 mm
Small-sized White Keshi pearls measuring 5-6 mm, 16" strands.
$12 for 1 strand

Item #N2536 - Peacock Keshi Pearls 5-6 mm
Small-sized Peacock Keshi pearls measuring 5-6 mm, 16" strands.
$12 for 1 strand

Item #N1285 - Pearlized Shell Keshi
These are shell beads shaped like keshi pearls and coated with a pearlized rainbow coating. These certainly make a very reasonably priced substitution for the real thing! Beads range from 5x6 to 6x14 mm, 15.5" strands.
$3.50 for 1 strand

Item #N1265 - Pearlized Shell Nuggets
These are shell beads shaped like freeform nuggets and coated with a pearlized rainbow coating. These certainly make a very reasonably priced substitution for the real thing! Beads range from 7.5x8 to 10x12 mm, 15" strands.
$3.50 for 1 strand

Item #M2462 - Double-drilled Cross Pearls
Double-drilled pearls are rare and hard to come across. Now they are available and in an interesting new shape as well! Although I call these 'Cross' pearls they are actually more shaped like an 'X' . Pearls measuring around 14x14 mm, 16" strands.
$42 for 1 strand

Item #K3102 - White Keshi 'Square Nugget' Drops
These are natural white Keshi side-drilled drop pearls that are more 'square nugget' in shape. These have a wonderful luster and color, measuring around 8 mm, 16" strands.
$20 for 1 strand