Sales at latest auction of rough emerald hit £22m at £42 per carat.
Argyle Diamond Mine has worked with indigenous people for 10 years.
Priorities include profitability, shipping and disciplinary measures.
Company sees 2% growth in production between July and September 2014.
Institute reduces per-stone fee for synthetic and natural testing.
Preliminary stats shows 20% rise in revenue and 17% production boost.
Company to provide diamond valuations for consumers trading stones.
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