This is Momi pikake style shell pendant/necklace. This necklace using white and yellow Momi lenalena shells design into ombre style.
Origin of shells: Niihau
Shells section measures: 3 inches (measures from end to end)
Over all necklace measures: 19 1/4 inches (Measures from end to end)
Findings: 14K Gold filled, Fancy Italian style