February 15

What Is the Density of Diamond? | Learn About This Important Feature!


Author: Alene Geed

Key Takeaways

  • The density of a diamond is 3.51 g per cubic centimeter. 
  • Because diamond has a high density, it sinks in water.
  • On the other hand, most diamonds, like quartz, which are fake, float in water.
  • Gemologists measure diamond density using heavy liquids. Other methods include the Berman scale or Hanneman balance.
  • Gemologists ensure precise temperature control, specimen preparation, absolute cleanliness, and replicate measurements to determine diamond density accurately.

You might find these terms too confusing if you're learning more about the world of gemstones. I, too, struggled when I started learning about the chemical composition of this gemstone. So, what is the density of diamond? In this article, I'll discuss how to determine diamond density.

What Is the Density of Diamond?

Diamonds have different properties and Mohs scale, which make each piece different from the others. One example of these properties is density. A natural diamond is a volcanic rock with several microscopic imperfections, making any two diamonds differ in density. 

You've probably heard the word density used interchangeably with specific gravity; however, these two have individual meanings. Density is the relationship between the volume of an object and its mass, while gravity measures the ratio between water and density.

Density refers to its weight ratio to its water volume. Thus, a stone with a density of 2.70 weighs 2.70 times the weight of the same volume out of water. The average density of a diamond is 3.52. The value will vary depending on the inclusions and traces on the diamond

Consequently, Brown diamonds from Brazil are 3.60, Yellow Diamonds from Africa have a density of 3.524, and diamonds from Australia have a density of 3.54.

What Determines Diamond Density?

Like other gemstones, diamond density combines several factors, such as crystal structure and chemical composition. Diamond is a polymorphous crystalline form of the carbon element. Since the diamond structure has its atoms packed tightly, its density is 3.5. 

How to Measure a Diamond’s Density

Now that you understand a diamond's density, I'll discuss further how to measure a diamond's density. 

When measuring the density of diamonds, you require a heavier liquid than water. Gemologists place the diamonds in a mixture of bromoform and toluene. The gemologists determine the diamond's density after confirming whether it'll float, sink, or stay suspended in the solution. 

Of course, other methods are also used to estimate a diamond's density. Most of these tests take place in gemological laboratories and geological institutions.

Determining a diamond's density is crucial because it lets gemologists differentiate authentic diamonds from synthetic stones

diamonds in a blue liquid

Do Colored Diamonds Have Different Densities?

Diamond density may differ in colored diamonds. Have you heard of carbonado? Carbonado diamonds are a type of black diamond found in the Central African Republic and Brazil. These diamonds are the toughest form of natural diamonds in the world. 

Carbonado diamonds are high-density, slightly denser, and tougher than mono-crystalline. Regardless of the diamond's color, its density can be challenging to determine if it contains many inclusions. Imperfection traces make the diamond's density useless.

That's why you'll find that diamonds with Vvs1 and Vvs2 clarity and are nearly perfect are more valuable. Furthermore, an extremely hard and flawless diamond (IF clarity) costs more and is extremely rare.

What Interferes With Diamond Density Measurements?

Ideally, two diamonds should have the same density and specific gravity. But, impurities, bubbles, and cracks in diamonds cause a diamond density disparity. The impurities rarely ever possess a similar specific gravity as the host diamond. Consequently, this hinders the importance of specific gravity used to examine gem identification

Surface tension can make the diamond "float" in a torsion balance and heavy liquid. Thus, this leads to erroneous specific gravity outcomes.

Accurate diamond density measurements involve total cleanliness, great specimen care, replicate measurements, and precise temperature control. 

graphic illustration of diamonds

Does Diamond Have High Density?

Because of its compact structure, diamond has a higher density than graphite. Diamond presents itself as a covalent network of carbon atoms, and graphite presents itself as a layered structure of hexagonal carbon sheets.

These atoms present themselves at the hexagon corners. The difference in diamond density varies between 3.5 to 3.53 grams per cubic centimeter.

What is the Density of Diamond g mL?

The diamond has a crystal structure with a face-centered cubic space diamond lattice with two identical. It has a high density, which ranges from 3150 to 3530 kgs per cubic meter (over 3X that of water density) for natural diamonds, and pure gold is 3520 kg/m3.

What is the Density of a Diamond in g cm3?

The density of a diamond is 3.51 g/cubic centimeter as opposed to 2.26 gm/cubic centimeter in graphite. 

What is the Density of a 1 Carat Diamond?

Carat measures the diamond's physical weight.

Diamond weight is in carats, where one ct = 0.200g or ⅕ gram and is subdivided into 100 points. 

Do Graphite and Diamond Have Similar Densities?

No, they don't have similar densities. Diamond and graphite have several similar characteristics; they are of carbon origin and polymorphous crystalline forms. 

Chemically, both gemstones are the same but have different optical properties. Diamonds have tightly bonded atoms, while graphite has loosely bonded atoms, making diamonds dense and tougher than graphite. Graphite has an average density of 2.2 grams per cubic centimeter.

clear diamonds on the dark surface


Why Is Diamond High Density?

Diamond is high density because pure carbon-carbon bonds are strong covalent bonds, which makes the diamond solid and hard. It's for the same reason that it has high density. Each carbon atom is hybridized and bonded tetrahedrally to four other carbon atoms by single covalent bonds. 

Are Heavier Diamonds More Expensive?

Due to their rarity, heavier diamonds command a premium price. The price difference isn't geometric but rather exponential compared to other minerals. In other words, a 1.00-carat diamond costs much more per carat than a 0.50-carat diamond, especially when selecting one to make a ring and necklace. 

Why Does Diamond Sink in Water?

Loose diamond crystals are highly dense gems and sink to the bottom when dropped in liquid water. Most fake diamonds – quartz and glass included – don't sink in water but float because they're less dense. However, this test might not be foolproof because large pieces like moissanite and cubic zirconia sink reasonably fast.

What Is Diamond Density Used For?

Diamond density works as an effective flowering stimulant, and it's useful because it forces a rapid onset of flowering when utilized in the first week of the flowering cycle. Secondly, it increases density and weight in weeks six to seven of the flowering cycle.

Does the Weight of the Diamond Matter? 

The carat weight of the diamond matters because it helps determine the price of the diamond while reflecting its rarity. So, if you're shopping for a diamond, you must find out the diamond's carat weight. 

About the Author:

Alene Geed

I am a published writer and an experienced jewelry designer. In my designs, I use gold, steel and silver, and adds gemstones to enhance the beauty of my unique, sparkling pieces of jewelry.

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