Rough Diamonds

Sierra Leone is one of the world's established sources of alluvial rough diamonds, drawn largely from the Kono district fields. Buying rough diamonds here lawfully means buying through a licensed exporter under the Kimberley Process Certification Scheme (KPCS) — the international system that confirms stones are conflict-free and legitimately sourced. Nova Parameter supplies KPCS-certified rough, graded across colour and clarity and sealed under serial-numbered certificate.

Kimberley Process certification

Every rough diamond parcel we export is valued by independent government valuers and sealed at the Precious Minerals Trading Directorate, accompanied by a serial-numbered Kimberley Process certificate. That certificate is your proof of lawful, conflict-free origin and is required for the parcel to clear customs in your destination country.

How rough diamonds are graded & valued

Rough is assessed across the standard criteria — carat, colour, clarity and shape — by a three-valuer government system that establishes an on-record value before export. This independent valuation protects the buyer: you are not relying on the seller's word for what a parcel is worth.

Diamond export duty & charges

A 3% export duty applies to rough diamonds, plus a 0.3% advance income tax and a 0.05% contribution to a rehabilitation fund, settled before the sealed parcel is cleared. We handle valuation, certification, duty and insured shipment end to end.