The Complete Buying Guide to Natural Black Diamonds (Updated 2025)

Natural black diamonds are some of nature’s most captivating and unique gemstones. With their opaque luster and deep black tones, these gems stand apart from traditional transparent diamonds. Known for their strength and bold aesthetic, black diamonds are increasingly sought after for jewelry and collections alike.

This guide explores everything you need to know about natural black diamonds, from their origins and types to their value and jewelry designs.

Related: View our collection of natural black diamonds for sale.

What Are Natural Black Diamonds?

Natural black diamonds, are a unique subset of fancy-color diamonds. Unlike transparent diamonds, black diamonds are completely opaque due to the high concentration of inclusions such as graphite, hematite, and pyrite within their crystalline structure. These inclusions give black diamonds their signature dark color and metallic sheen.

Some Black Diamonds Are Also Known As Carbonado. Carbonados are found in alluvial, sedimentary deposits close to or on the Earth’s surface. Only two regions of the world are known to yield these mysterious gems: the Central African Republic and Brazil.

The Origin of Black Diamonds

Natural black diamonds are found in limited regions worldwide, including Brazil and the Central African Republic.

Some black diamonds,known as carbonados have unknown origin, This is particular to the Carbonado diamonds, as their composition, trace elements, and other characteristics could support hypotheses of extra-terrestrial origins. A meteor or asteroid impact hasn’t been ruled out yet.

Understanding the Value of Black Diamonds

Several factors determine the value of black diamonds:

Origin

Natural black diamonds are rarer and more valuable than treated or lab-grown counterparts.

Inclusions

While inclusions define a black diamond’s color, excessive surface-reaching inclusions can weaken the stone’s structure, reducing its value.

Size (Carat Weight)

Larger black diamonds are harder to find, leading to significantly higher prices for larger carat weights.

Polish and Finish

A well-polished black diamond with minimal surface blemishes is more desirable.

Famous Black Diamonds

The Enigma is a carbonado-type black diamond and weighs a staggering 555.55 carats.

The Enigma is the largest known cut diamond in the world. Recently sold for 4.3 million dollars in an online auction, the extremely rare gem weighs 555.55 carats and bears 55 facets.

Black Orlov 

Also known as the Eye of Brahma Diamond, the 67.50 carat stone is one of the most famous black diamonds.

The Black Orlov diamond has been displayed at the American Museum of Natural History in New York City and the Natural History Museum in London. The cushion-cut stone weighs 67.50 carats and is set in a brooch that attaches to a necklace. 

Grousi Diamond 

The Gruosi Diamond is an exquisite, heart-shaped black diamond.

The renowned Swiss jeweler Fawaz Gruosi has long admired black diamonds and saw their potential for high jewelry. The Gruosi Diamond is the largest heart-shaped black diamond in the world, weighing 115.34 carats. 

Discover more about the Grousi Diamond in our Diamond Encyclopedia

How to Wear Black Diamonds

Black diamonds are versatile and perfect for creating bold jewelry designs:

Engagement Rings

• Pair a black diamond with platinum or white gold for a dramatic contrast.
• Use halo settings with colorless diamonds to add brilliance to the opaque stone.

Wedding Bands

• Combine black diamonds with colorlessdiamonds for a striking and modern design.

Everyday jewelry

• Incorporate black diamonds into necklaces, earrings, or bracelets for a touch of elegance.

Why Cut Matters for Black Diamonds

Unlike transparent diamonds, where cuts maximize brilliance, black diamonds rely on cut quality to enhance their symmetry and shape. Popular cuts include:

• Round: Timeless and versatile.

• Cushion: Highlights the gem’s luster.

• Emerald: Creates a sleek, modern aesthetic.

How Rare Are Black Diamonds?

Natural black diamonds are rare, representing a small fraction of all diamonds mined. Treated and lab-grown black diamonds are more widely available, making natural stones a premium choice for collectors and investors.

Did You Know: Most Black Diamonds Are Heated!

Heat treatment is a common industry practice used to achieve a uniform black color by subjecting diamonds to very high temperatures. In fact, most jewelry is made with heated black natural diamonds. It is extremely rare to find good quality natural black diamonds, and they command much higher prices.

Caring for Your Black Diamonds

Black diamonds, while durable, are more brittle than traditional diamonds due to their inclusions. To protect your investment:

● Avoid ultrasonic cleaners or harsh chemicals.

● Use lukewarm water and a soft cloth for cleaning.

● Store separately to prevent scratching.

Langerman’s Black Diamond Collection

At Langerman, we offer an exclusive selection of natural black diamonds, ranging from polished stones to exquisite bespoke jewelry. Whether you’re seeking a bold engagement ring or a unique collector’s gem, we’ll help you find the perfect piece.

Final Thoughts

Black diamonds are a striking choice for those seeking something unique and elegant. Their rich history, rarity, and dramatic aesthetic make them a standout option for jewelry or investment. Explore Langerman’s curated collection of natural black diamonds today and create a one-of-a-kind piece that reflects your bold style.

Design your dream jewelry today!

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Contact us to and we will guide you in the process of selecting the perfect black diamond.