Uncut Raw Diamond Value Guide

This uncut raw black diamond, also known as carbonado, represents one of the toughest natural mineral forms originating from Brazil. Formed under extreme mantle pressure, these ancient specimens are highly collectible for their unique polycrystalline structure and matte, metallic luster.

What affects the value of Uncut Raw Diamond?

• Carat weight and overall physical dimensions of the raw stone.
• The intensity and uniformity of the black coloration across the specimen.
• Structural integrity, specifically the absence of large cracks that might hinder artisanal cutting or setting.
• Origin documentation confirming the stone as a natural Brazilian formation rather than a lab-treated 'bort' diamond.

How to Identify Uncut Raw Diamond?

• Look for the characteristic opaque, dark grey to black coloration unique to Brazilian carbonado.
• Verify the presence of a porous or 'cinder-like' surface texture which distinguishes raw black diamonds from polished stones.
• Check for high thermal conductivity and a hardness of 10 on the Mohs scale, which separates genuine diamond from black spinel or tourmaline.
• Examine the stone for a lack of traditional cleavage planes, as carbonado is a polycrystalline aggregate.

History of Uncut Raw Diamond

Diamonds are formed deep within the Earth's mantle under extreme heat and pressure. These raw, uncut stones are valued for their natural beauty and unique characteristics, often used in artisanal jewelry or as collector's items. Black diamonds, also known as carbonado, are among the toughest forms of natural diamond.