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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,952 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesResearch instituteLucerneGRS Gemresearch Swisslab AG
GRS Gemresearch Swisslab AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

GRS Gemresearch Swisslab AG is a gemological research laboratory that examines the origin and authenticity of rubies, sapphires, emeralds and other colored gemstones. It issues gemstone reports and investigates treatments and color characteristics.

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Products & services

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GRS Gemresearch Swisslab AG

✓ Offered
5
Gemstone Reports
Gemstone reports for loose gemstones, pairs, sets and mounted jewellery; include identification, authenticity, treatment and country-of-origin opinions for coloured gems such as ruby, sapphire, emerald, spinel, tourmaline and garnet.
Gemstone Report Verification
Online verification of GRS gemstone reports by report number, date and weight, or by scanning the QR code printed on the report; available free of charge.
Gemstone Enhancement Disclosure
Disclosure and grading of gemstone treatments, including heat treatment in ruby and sapphire, clarity enhancement in emerald, and other treatments such as coating, dyeing, oil, resin and irradiation.
Laboratory Testing and Submission Services
Stone submission, shipping instructions and turnaround options for laboratory analysis in Switzerland and other locations; includes regular, priority and express service arrangements.
Gemological Research Publications
In-house publications on gemology, including the 'Contributions to Gemology' series in hard copy and digital PDF form, with topics on gemstone origin, identification and treatments.
Trust & reputation

ranQ Trust Score of GRS Gemresearch Swisslab AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of November 2026

GRS Gemresearch Swisslab AG scores 65.9 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.78.124%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.49.510%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.50.08%
GRS Gemresearch Swisslab AG scores 92.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.82.07%
GRS Gemresearch Swisslab AG scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).85.022%
GRS Gemresearch Swisslab AG scores 100.0 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.100.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

GRS Gemresearch Swisslab AG reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 5.0 out of 5 stars from 6 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of November 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 6 reviews across all connected sources

Sources
GGoogle56
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Knowledge

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Comparisons

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Location

Habsburgerstrasse 12
6002 Lucerne
Opening hours
Mon
09:00 - 12:00, 13:30 - 17:00
Tue
09:00 - 12:00, 13:30 - 17:00
Wed
09:00 - 12:00, 13:30 - 17:00
Thu
09:00 - 12:00, 13:30 - 17:00
Fri
09:00 - 12:00, 13:30 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-108.206.451
Founded
1996 · 30 years
Last commercial register change
July 6, 2026
Employees
21 to 50
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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