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.

Yellow Diamond A coloured diamond with a natural yellow body colour.
Yellow Diamond

A yellow diamond is a coloured diamond characterised by its natural yellow body colour.

World Federation of Diamond Bourses

The World Federation of Diamond Bourses (WFDB) is an international confederation of diamond bourses, or exchanges, which[…]

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[…]

Upper-Girdle Facet

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

Twinning Line

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

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[…]

Trigon

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

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[…]

Transparency

Transparency in diamonds refers to the degree to which light can pass through the diamond's material, offering[…]

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.

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