Diamond House · Heritage Gemology
Authenticating Heritage.
Preserving Trust.
Professional gemstone authentication, certification — and a curated catalog of precious and semi-precious stones available to purchase, backed by a legacy of traditional jewelry craftsmanship.
Every gemstone examined by Diamond House Gem Lab is carefully analyzed and issued a secure authentication certificate with a unique verification ID.
A Legacy in Stone
Diamond House Gem Lab is a professional gemstone authentication house — rooted in Maharashtrian heritage, master craftsmanship, and timeless elegance.
Built on trust and precision, our certification process helps customers, collectors, jewelers, and families verify the authenticity and characteristics of their precious gemstones with confidence.
Est. 1979 · Three Generations
A jewellery house built in 1979.
A gem lab built for today.
Diamond House was founded in 1979 by Prakash Kolhapure — Aakanksha's grandfather. Nearly five decades later, the same family — now in its third generation — brings certified gemology and modern laboratory science to the trust that started it all.
- 01
1979
Prakash Kolhapure
Aakanksha's grandfather established Diamond House in Kolhapur — a small jewellery house built on honesty, hand-picked stones, and a handshake.
- 02
Second Generation
Prasad Kolhapure
Aakanksha's father carried the trade forward — deepening relationships with mines, cutters, and clients who returned generation after generation.
- 03
Today
Aakanksha Kolhapure
Third-generation gemologist. Certified in modern gemology and an authenticated member of the gemological society — pairing heirloom trust with laboratory precision.
How it works
From your hand to a verified certificate — in four simple steps.
No jargon, no guesswork. Here is exactly what happens when you bring a stone to us.
- 01
Bring your stone
Drop it off at our Kolhapur atelier, or book a private viewing.
- 02
We examine
Microscope, refractometer, polariscope — the full gemological work-up.
- 03
Receive your card
A signed certificate card with a unique ID and a scannable QR code.
- 04
Verify anytime
Anyone, anywhere — scan the QR to confirm authenticity on this site.
Services
Gemological Examination
- 01
Natural Gemstone Authentication
We confirm whether your stone is natural, treated, or synthetic — in plain language.
- 02
Diamond Verification
4Cs report — cut, colour, clarity, carat — for loose and mounted diamonds.
- 03
Ruby, Emerald & Sapphire
Origin opinion and treatment disclosure for the big three coloured stones.
- 04
Natural vs Synthetic ID
Lab-grown vs earth-mined — separated under the microscope, never guessed.
- 05
Certification Cards
A printed visiting-card certificate travels with your stone, forever.
- 06
QR Digital Verification
Scan the QR — your certificate appears here, instantly, anywhere.
- 07
Jewelry Stone Evaluation
Honest, unbiased opinion on stones already set in your family jewellery.
The Catalog
We don't just certify. We sell, too.
The nine sacred Navratna stones and a curated wider spectrum of semi-precious gems — each hand-picked, personally evaluated, and dispatched with its own authentication certificate.
Explore the CatalogThe Certificate Card
A signed, scannable mark of authenticity.
Every authenticated gemstone receives a visiting-card-sized certificate — onyx front, ivory back, gold corner marks, and a QR code that points to its digital verification on this site. The card travels with the stone; the truth lives in the database.
- · 3.5″ × 2″ business-card format · printable PNG export
- · QR links directly to /?cert=ID for instant verification
- · Generated automatically when admin issues a certificate
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Certificate Verification
Verify Your Authentication Certificate
Each gemstone certificate issued by Diamond House Gem Lab carries a unique Certificate ID and QR verification system for secure validation. Enter your Certificate ID below to access the gemstone authentication report.
Try the sample ID AKGL-2026-00421
Certified By
Aakanksha Kolhapure
Professional Gemologist
In Their Words
Trusted across generations
We've been buying gold from Diamond House since my mother's wedding. When Aakanksha tested my grandmother's emerald and gave us a proper certificate, it felt like the family had finally caught up with the times — without losing what made them special.
Priya Deshmukh
Customer · Kolhapur
I went to three jewellers in Pune before someone told me to drive to Kolhapur. Prasad sir picked out a pair of natural blue sapphires within ten minutes. The certificate, the photos, the price — everything was upfront. Worth the trip.
Rohit Joshi
Customer · Pune
Got our engagement ring made here with a solitaire we chose ourselves. They walked us through every C, showed inclusions under the microscope, and didn't push us towards anything. Quiet confidence — that's the only way to describe it.
Sneha & Amey
Couple · Kolhapur
Visit & Connect
Three showrooms. One trusted house.
Walk into any of our locations across Kolhapur and Pune, or message us first and we'll have the stone ready for you.
- Open in Maps
Kolhapur — Showroom
230B, Jotiba Road
Kolhapur 416012
- Open in Maps
Kolhapur — Lab
607, Krystal Square
Behind Khanwilkar Petrol Pump, Kolhapur 416003
- Open in Maps
Pune — Branch
3, Radha Krishna Apartment
Bibwewadi-Kondhwa Road, Pune 411037