ISO 9001:2015
Leading the benchmark for scientific gemological diagnostics, authenticity verification, and ISO 9001:2015 certified testing standards.
Established in Krishnagar, West Bengal, Koustav Gemological Laboratory was founded with a singular commitment: to provide uncompromised, unbiased, and scientifically rigorous testing for gemstones, diamonds, and precious minerals.
Our laboratory operates under strict ISO 9001:2015 quality management systems. Every diagnostic report is backed by multi-parameter optical readings, specific gravity measurements, microscopic examination, and cryptographic QR verification.
We pledge to maintain total impartiality and technical excellence in every diagnostic examination. All optical constants, absorption bands, and microscopic inclusions are verified by senior certified gemologists prior to certificate dispatch.
Our laboratory is equipped with precision optical and electronic gemological equipment for comprehensive specimen analysis.
Measures refractive index (R.I.) and birefringence up to 1.81 to differentiate gemstone mineral species and optic signs (isotropic vs. anisotropic).
Determines optic character (Uniaxial, Biaxial, Aggregate) and detects internal strain, twinning, and pleochroism in colored stones.
Analyzes diagnostic absorption spectrum bands to detect artificial color treatments, beryllium diffusion, and synthetic origin.
Electronic micro-balance for precise specific gravity (SG) determination to classify loose gemstones accurately.
Stereo zoom magnification with fiber-optic illumination to examine 3D crystal inclusions, growth zoning, and fissure fillings.
Fluorescence and phosphorescence analysis under 365nm and 254nm ultraviolet light for diamond and gemstone authentication.
Contact our certified gemological team in Krishnagar for consultations, testing rates, and turnaround schedules.