Diamond House Gem Lab

The Lab

Six tests. One signature. Zero shortcuts.

Most "certificates" in the market are a printed promise. Ours is six instruments, a trained gemologist, and a unique ID you can verify long after you've left the shop.

The Process

What happens to your stone

  • Refractive Index — Gem Refractometer at Diamond House Gem Lab

    Test 01

    Refractive Index

    Gem Refractometer

    Measures how light bends through a stone. Each gem species has a unique RI range — ruby reads 1.762–1.770, sapphire 1.762–1.778. The single most reliable identifier for natural vs simulant.

  • Microscopic Examination — 10×–60× Gemological Microscope at Diamond House Gem Lab

    Test 02

    Microscopic Examination

    10×–60× Gemological Microscope

    Inclusions are the fingerprints of a gem. Silk in ruby, fingerprints in sapphire, three-phase inclusions in emerald — we map each one to confirm origin, treatment and natural status.

  • Specific Gravity — Hydrostatic SG Balance at Diamond House Gem Lab

    Test 03

    Specific Gravity

    Hydrostatic SG Balance

    Density measurement that separates look-alikes the eye can't. Distinguishes natural spinel from synthetic, tourmaline from peridot — and confirms whether a 'diamond' is actually a moissanite.

  • Polariscope & Pleochroism — Polarizing Filters · Dichroscope at Diamond House Gem Lab

    Test 04

    Polariscope & Pleochroism

    Polarizing Filters · Dichroscope

    Reveals the optical character of a stone — singly or doubly refractive — and how it shows different colours from different angles. Essential for separating ruby from garnet, sapphire from tanzanite.

  • Treatment Detection — UV Lamp · Microscope · Reference Stones at Diamond House Gem Lab

    Test 05

    Treatment Detection

    UV Lamp · Microscope · Reference Stones

    Heat, flux healing, glass filling, beryllium diffusion — modern treatments are sophisticated. We flag every enhancement we detect, because what's been done to a stone affects what it's worth.

  • Final Certification — Signed by Aakanksha Kolhapure, G.G. at Diamond House Gem Lab

    Test 06

    Final Certification

    Signed by Aakanksha Kolhapure, G.G.

    Every test result is consolidated into a tamper-evident certificate with a unique ID and QR code. Verifiable in seconds, anywhere in the world — the certificate stays valid even after we close for the day.

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