From rough to polished

Diamonds

One standard: every diamond polished by skilled artisans in our Sri Lankan facility.

Origin of cut
Sri Lanka
Scale
1,450 team members

A stones journey in NIRU Sri Lanka

From round to fancy and precision cut diamonds,
crafted with precision, technology and traceability.

Rough diamond

113

Hand switches

57

Processes

32

QC Checks

16

Divisions

Polished diamond

Diamond polishing wheel engaged on the stone, sparks rising from the contact point on the Sri Lankan polishing line

01 / Polishing

01 / Polishing

Polishing.

Each stone is cut and transformed by NIRU Sri Lanka artisans.

Gemmologist examining a diamond mounted on a dop stick through a loupe at the NIRU internal laboratory

02 / Quality Assurance

02 / Quality Assurance

Quality assurance.

Internal checks accompany each diamond, from first inspection to final release.

Small rough natural diamond crystals scattered on a wooden surface, before entering the manufacturing process

03 / Naturality Screening

03 / Naturality Screening

100% diamonds screened for naturality.

At the last point before packing, every stone is screened on Assure Program equipment by lab controllers trained by GGTL, and sealed for supply.

Array of diamond dop sticks at the NIRU manufacture, each tool tracked end to end across every stage

04 / Tracking

04 / Tracking

Tracking.

Every stone is tracked from rough to polished, with a full internal record retained for 5 years.

Our standards begin here

Diamond Shape Catalogue.

NIRU diamond collection: round to fancy shapes. Baguette precision-cut within a tolerance of ±0.01 mm.

  1. Round Brilliant

  2. Princess

  3. Emerald

  4. Cushion

  5. Marquise

  6. Pear

  7. Baguette

  8. Taper

  9. Asscher

  10. Radiant

  11. Trapeze

  12. Oval

Continue exploring
stones.

Colored stones and naturality.

01 Colored gemstones laid in a rainbow gradient Colored Stones Sapphire, ruby and emerald, polished in Bangkok. 02 A river running through untouched forest Naturality 100% screened in NIRU laboratories.

One group,
a world of expertise.

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One contact for the entire group. Your enquiry will be directed to the right team.

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