ISO 9001:2015
Diagnostic turnaround schedules, physical specimen return procedures, and insured certificate dispatch at Koustav Gemological Laboratory.
Standard Examination: Routine gemstone identification and diamond grading are completed within 24 to 48 business hours of specimen intake at our Krishnagar diagnostic center.
Express Service: Same-day priority testing is available upon prior appointment for urgent commercial or trade consignments.
Clients may collect tested specimens and physical PVC cards directly from our billing counter or opt for secured, insured express courier delivery across West Bengal and India. Consignment tracking numbers are communicated via SMS / WhatsApp once dispatched.
While physical certificate cards are being dispatched or picked up, electronic test results are instantly available for online validation 24/7 on https://koustav.org/test immediately upon laboratory supervisor sign-off.