This is Kahelelani poepoe style shell necklace/pendant. This pendant made of green oma'oma'o, pink ‘ākala pua and burgundy māku‘e Kahelelani shells with Tahitian pearl centerpiece.
Origin of shells: Niihau
Shells measures: 1 3/4 inch (measures from jump ring to jump ring)
Over all necklace measures : 17 3/4 inches (measures from end to end)
Pearl size: 7.95 mm
Findings: 14K gold filled
Chain style: Fancy Italian