Masterclasses

Diamond

A considered NOBILITH introduction to diamond: colour, character, documentation and individual selection.

At NOBILITH, diamond is introduced as a complete gemstone rather than a single visual impression. Diamond is crystallised carbon and the hardest naturally occurring mineral commonly used in jewellery. Its optical performance depends on cut, colour, clarity, carat weight and the individual character of the stone.

Chapters

Introduction

Formation

Every diamond carries a history of formation, growth and change. Natural diamonds form deep within the Earth under high pressure and temperature, then reach the surface through volcanic pipes. Their inclusions and chemistry preserve evidence of their geological history.

Mineralogy and chemistry

Its mineral identity provides the foundation, while the individual stone gives that foundation its character. Diamond is carbon in a cubic crystal structure. Its hardness, thermal conductivity, optical dispersion and cleavage are important for identification, setting and care.

Colour

Colour is often the first thing we notice, but it is the balance of the whole stone that holds the eye. Colour grading in colourless diamonds concerns the presence and strength of body colour. Slight differences can influence appearance, but cut, fluorescence, size and viewing conditions also matter.

Origins

Locality can add context to a gemstone, but it belongs to the evidence of the individual stone and not to assumption. Geographic origin is generally not determined for an individual polished diamond by standard grading alone. Claims about provenance require separate chain-of-custody evidence and must not be inferred from appearance.

Inclusions

The interior of a gemstone is part of its story and should be read with curiosity and restraint. Clarity characteristics may be internal or surface-reaching. They affect transparency, durability and identity, and they are recorded within the limits of the grading method.

Gem Lab

Diamond microscope study

Compare internal features that may be visible in a diamond under magnification.

Illustration: microscope view of a diamond with an included crystal

Choose a lens

Swipe or choose a lens

Microscope images: illustrations of typical features, not a laboratory finding.

10×

Crystal inclusion

A crystal inclusion is a mineral feature enclosed within the diamond. Reports use defined terminology to describe such observations.

Treatments

Treatment belongs in the dossier because it shapes how a gemstone should be understood, cared for and described. Diamond may be treated to alter colour or clarity. Laboratory disclosure is essential because treatment can affect care, durability, appearance and market understanding.

Cut and proportions

Cut is where material becomes presence: it controls how the gemstone meets light and how it feels when viewed. Cut determines how a diamond returns light. Proportions, symmetry, polish, facet precision, brightness, fire and scintillation should be considered together rather than reduced to a single grade.

Quality characteristics

A serious assessment looks for balance rather than a single headline characteristic. The four Cs provide a useful framework, not a complete definition of beauty. Fluorescence, optical performance, appearance and the quality of the report also matter.

Laboratory examination

Laboratory work is strongest when several observations are brought together and interpreted in context. Laboratories examine optical properties, inclusions, proportions, treatments and other identification features. A grading report is not the same as an appraisal or guarantee of future value.

Origin determination

An origin opinion is valuable precisely because it is evidence-led and allowed to remain inconclusive when necessary. Do not confuse geographic origin with laboratory identification or ethical sourcing documentation. A responsible provenance statement must identify its evidence and limits.

Understanding the report

A report becomes useful when it is read as one part of the gemstone's wider identity and dossier. Review report number, grading laboratory, measurements, proportions, clarity plot, fluorescence, treatment comments and verification link.

History and significance

The cultural story of a gemstone can enrich ownership while remaining separate from its examination record. Diamond has been associated with endurance, commitment and ceremonial meaning. Its history includes both artistic achievement and complex social and environmental questions.

NOBILITH Selection

NOBILITH selection begins with the complete picture and ends with a clear reason for choosing the individual gemstone. NOBILITH evaluates diamonds through verified documentation, optical performance, treatment transparency and a clear separation between grading facts and provenance claims.

Updated 2026-09-30