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Method Summary An eight kilogram sample is fused in a kiln containing caustic soda. The molten residue is then poured through a stainless steel wire mesh at the required size, and is chemically treated to reduce the residue to a manageable size. The residues are then observed and the diamonds recovered. Quality Control The quality of this method is monitored by assessing the recoveries of separately added synthetic diamonds to the sample during the caustic fusion and chemical treatment processes. If customers are considering spiking their own samples, as an additional quality control measure (blind spikes), please consult the laboratory for the correct type/quality of synthetic to be used. If the blind additions are identical to the laboratory QCs it is impossible for the laboratory to distinguish between the in-house and blind QCs which may give an inaccurate recovery.
For further information: Contact the laboratory (geolab@src.sk.ca) Or Diamond Laboratory Supervisor
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