Where is Black Diamond found?

Black Diamond occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.

Where to find Black Diamond

Collecting tips

1. Geological Context. Focus on alluvial deposits in known carbonado regions (Brazil, Central African Republic) or kimberlite/lamproite pipes for inclusion-rich black diamonds. Understanding the local geology is crucial.
2. Density Test. Diamonds are significantly denser than most common minerals. A specific gravity test can help differentiate them from other black minerals. Diamond's specific gravity is 3.50-3.53 g/cm³.
3. Hardness Test. Diamond is the hardest known natural material (Mohs 10). It will scratch all other minerals. This is a destructive test, so use with caution on potential specimens.
4. Visual Inspection. Look for the characteristic opaque black color, often with a duller luster than typical diamonds. Carbonados may have a porous, irregular, and somewhat 'clinkery' appearance. Inclusion-rich black diamonds might show a more typical diamond crystal habit if not too heavily included.
5. Professional Identification. Due to their value and the difficulty in distinguishing them from simulants or other black minerals, professional gemological testing (e.g., Raman spectroscopy, X-ray diffraction, specific gravity, thermal conductivity) is highly recommended for definitive identification.

Quick Check

Color:

Opaque black to dark grey

Luster:

Sub-metallic to adamantine, often dull

Streak:

Colorless (will scratch a streak plate, but leaves no colored powder)

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