Solomon Islands · Shell Craft / Currency Making

Langalanga Shell Money Making (Malaita)

Rokosama (shell money)

The Langalanga people of the lagoon off the western coast of Malaita Island (Solomon Islands) produce the shell money (rokosama) that is still used as currency for bride price, compensation, and ceremony throughout Malaita. Shell money is made from tiny discs of shell — primarily from three species: white discs from Malaita clam, orange-red discs from spondylus, and black discs from black-lip oyster — each ground to exactly 6-8mm diameter and strung in specific value sequences. The defining technical knowledge is the grinding uniformity: each disc is ground on a flat stone until it matches the diameter standard — assessed by threading onto a reference string: 'when the disc slides freely but does not rattle, the diameter is correct.'

Risk level: Critically Endangered · Solomon Islands national ICH list; Pacific cultural heritage

Alternate Names
Shell money; rokosama; Langalanga shell disc; Malaita shell currency
Geographic Center
Langalanga Lagoon, Malaita Island, Solomon Islands
Community / Ethnic Group
Langalanga people — lagoon-dwelling shell money makers of Malaita
Estimated Origin
Ancient Malaita tradition; shell money documented from earliest European contact; continuous use as currency to present
Cultural Function
Active currency — bride price, compensation, ceremonial exchange; each strand color and sequence has specific value; most labor-intensive currency in the world
Primary Materials
Malaita clam (white disc), spondylus (orange-red disc), black-lip oyster (black disc); flat grinding stone; reference string for diameter check
Primary Tools
Flat grinding stone; drill for center hole; reference string (diameter standard); water
Process Overview
Shell breaking -> center hole drilling -> threading on reference string -> circular grinding on flat stone -> string diameter test -> accept or continue grinding -> value stringing assembly
Traditional Applications
Active currency — bride price, compensation, ceremonial exchange
Contemporary Applications
Cultural heritage; anthropological study; museum collection
Notable Practitioners
Langalanga lagoon community — approximately 200 active shell money makers; family specializations within Langalanga
Key References
Guo, P. (2006). Fishing Practices and Fish Trade in the Context of Oceanic Exchange. University of Hawaii Press; Solomon Islands National Museum documentation; Pacific Community (SPC) cultural records
Verification Status
Verified

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