NISHI EXPORT - EST.1995

Natural Brown Diamonds

Explore the complete spectrum of natural brown diamonds from C1 to C8, guided by three decades of Nishi Export expertise.

The Spectrum

Every shade of brown, classified

The C1-C8 Spectrum: from warm Champagne tones to rich Cognac hues

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Origin

The story beneath the surface

Formed deep beneath the Earth's surface, brown diamonds tell a story millions of years in the making. Discover the origins of the spectrum and the legacy behind it.

Discover the Story

Name Translator

One language, Zero confusion

The same shade can be known by many names. Sienna bridges this gap instantly.

Standard GradeInternal NameMarket Name

C1AIRChampagne Diamond

C2PANIChampagne Diamond

C3OFFWHITEChampagne Diamond

C4HAWAChampagne Diamond

C5NWChocolate Diamond

C6OWLBChocolate Diamond

C7C7Chocolate/Cognac Diamond

C8C7Cognac Diamond

Capabilities

Why Sienna?

Built on three decades of expertise from Nishi Export, Sienna AI helps you navigate brown diamonds with ease.

Explore Shades

View the complete brown diamond spectrum from C1 to C8.

Translate Names

Match industry grading to internal names

View Diamonds

Explore brown diamonds in high-resolution 360°.

Learn More

Learn more about brown diamonds.

Ready to explore?

Enter the Spectrum

Discover shades, compare diamonds, and ask Sienna. No login required.

For further enquiries, contact us at:
siennabynishiexport@gmail.com

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