History of Diamond Grading in Australia

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Explore DCLA’s legacy as Australia’s leading diamond authority. Learn our history, meet the founders, and discover our unmatched grading expertise.

Upper-Girdle Facet

An Upper-Girdle Facet refers to a triangle-shaped facet that is positioned along the girdle of a diamond,[…]

Wavy Girdle Girdle that is uneven in thickness and/or does not follow a straight plane around a diamond
Wavy Girdle

A wavy girdle refers to a girdle of a diamond that is uneven in thickness or does[…]

Diamond cut or shaped into a triangle, sometimes with curved sides.
Trilliant

A Trilliant cut, also known as a trillion cut, is a diamond shape characterised by its triangle-like[…]

Twinning Line

A Twinning Line is a specific type of diamond inclusion that appears as a line or ribbon[…]

Treated Diamond Diamonds that are artificially enhanced, to improve either colour or clarity
Treated Diamond

A treated diamond refers to a diamond that has undergone artificial enhancement to improve one or more[…]

Trigon

A Trigon is a unique feature found in some natural diamonds that is characterised by its triangular[…]

Toughness Measure of brittleness, or resistance to fracture and breaking
Toughness

Toughness refers to a diamond's resistance to fracture or breaking when subjected to impact or stress.

Table

The table is one of the most important facets of a polished diamond, situated at the very[…]

Table Size

Table size refers to the measurement of the table facet of a diamond, which is the large,[…]

Step Cut A style of diamond cutting creating rows or steps of elongated facets
Step Cut

A step cut is a style of diamond cutting that creates a distinctive look with rows or[…]

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