This is Kahelelani poepoe style shell necklace/pendant. This pendant made of pink ‘ākala pua Kahelelani shells with Tahitian pearl centerpiece.
Origin of shells: Niihau
Shells measures: 1 1/2 inch (measures from jump ring to jump ring)
Over all necklace measures : 16 3/4 inches (measures from end to end)
Pearl size: 8 mm
Findings: 14K gold filled
Chain style: Fancy Italian