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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryIndustryManufacture of IT HardwareLosoneDiamond SA
Diamond SA Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Diamond SA is a vertically integrated company specializing in the development and manufacture of high-precision and high-performance optical components and systems. The company's core activity encompasses the production of optical components such as polarization-maintaining (PM), core-core alignment (ACA), ULL Power Solution (PS), VIS/NIR short wavelengths, Optical Line Identification (OLID), high-temperature connectors, specialty fiber ferrules, and lens ferrules. In addition, the company offers services including planning and installation of FTTX systems, testing and calibration laboratory, and ISO 7 cleanroom. The company processes high-quality ceramic, plastic, and metal components, from raw material to finished product, and has full control over the supply chain and manufacturing process.

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Products & services

Industry:Manufacture of IT Hardware
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Diamond SA

✓ Offered8
Connectors & adapter sleeves
Fiber optic connectors and adapter sleeves for precise, reliable connections, including Low Loss and Ultra-Low Loss as well as E-2000®-based solutions.
Active components
Active components for fiber-optic applications, including high-power interfaces and technologies for high-power, photonics and quantum applications.
Splicing, terminations and test cables
Splicing, terminations and test cables for fiber-optic connections, matched to assembly, testing and use in demanding applications.
Fiber optic wall outlets
Fiber optic wall outlets for fiber-optic installations and distribution, complementing the range of interconnect and component solutions.
Special products
Special products on request for custom fiber-optic requirements, in particular where standard solutions are not sufficient.
Manufacturing expertise
Vertically integrated manufacturing using ceramic CIP/CIM processes, metal machining and plastic injection molding for high-precision fiber optic components.
LWL fiber and cable assembly
Assembly of lightwave fiber strands and cables for custom fiber-optic interconnects and solutions.
Fiber optic solutions for demanding markets
Fiber optic interconnects and components for photonics, space, medical technology, industry, high power, quantum optics, defense and telecommunications.
Trust & reputation

ranQ Trust Score of Diamond SA: 4.4 out of 5.0

Trust Score4.4/ 5.0

Very high

x

Data basis 96% · As of October 2026

Diamond SA scores 78.4 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.71.724%
  • 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.77.410%
  • 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.100.08%
Diamond SA scores 95.8 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.96.07%
Diamond SA 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%
Diamond SA scores 14.0 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 35.14.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Diamond SA reaches a ranQ Trust Score of 4.4 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.5 out of 5 stars from 20 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.5
of 5

Aggregated from 20 reviews across all connected sources

Sources
GGoogle4.520
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Via dei Patrizi 5
6616 Losone
Opening hours
Mon
07:30 - 12:00, 13:30 - 17:30
Tue
07:30 - 12:00, 13:30 - 17:30
Wed
07:30 - 12:00, 13:30 - 17:30
Thu
07:30 - 12:00, 13:30 - 17:30
Fri
07:30 - 12:00, 13:30 - 17:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-102.120.561
Founded
1987 · 39 years
Last commercial register change
February 12, 2025
Employees
101 to 500
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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