Published : 2025-03-13

Red Diamond: The rarest and most expensive precious stone in the world!

- Categories : Diamond News , Gemmology News

Red diamonds are among the rarest and most fascinating gemstones in the world. They stand out for their unique hue and exceptional value in the gemstone market. Why are they so rare? What is their price? What are their secrets? Here is a complete guide on this mythical stone.

What is a red diamond ?

The red diamond is a variety of natural diamond that owes its color to a unique atomic deformation. Unlike other colored diamonds such as the pink or blue diamond, the red color does not come from impurities, but from an alteration of the carbon crystal structure.

The characteristics of the red diamond

Color : Intense red, sometimes with shades of pink or purple.
Purity : Like any diamond, it may have inclusions, but these are rare in high-value stones.
Hardness : It retains the exceptional hardness of diamond (10 on the Mohs scale).
Origin : Exclusively extracted in certain regions of the world, notably in Australia, Brazil and Africa.

The origin of red diamonds

The mines producing red diamonds

Red diamonds are primarily extracted from the Argyle mine in Australia, which closed its doors in 2020. Other sources include Brazil and some mines in Africa. However, these deposits produce extremely limited quantities.

A unique training

The red diamond is formed under extreme pressure and temperature, altering the crystalline structure of carbon. Unlike other colored diamonds, its hue comes from a phenomenon called "plastic deformation", which alters the organization of its atoms.

Why is the red diamond so rare ?

The red diamond is so rare that it is estimated that only a few dozen specimens exist in the world. Unlike the ruby, which is a precious stone Red more widespread, the red diamond is much more difficult to find and extract.

The extreme rarity of natural stones

Every year, only a few stones are auctioned. This rarity contributes to their exorbitant price and their status as exceptional jewels.

Price of the red diamond: a priceless stone

The price of a red diamond varies according to several criteria: its weight in carats, its purity, its color intensity and its origin.

Average price per carat

Red diamond 1 carat : Between 1 and 2 million euros.
5 carat red diamond : Can reach up to 10 million euros.
24 carat red diamond : Practically untraceable, but its price easily exceeded 50 million euros.

The most famous red diamonds and their price

The Moussaieff Red Diamond (5.11 carats): One of the largest red diamonds ever found, sold for over 20 million euros.
The Kazanjian Red Diamond (5.05 carats): A historic diamond that has belonged to several prestigious collectors.

Red diamond vs others precious stones reds

Difference between red diamond and ruby

The ruby and the red diamond are often confused due to their similar color, but they have major differences:

Hardness The red diamond (10 Mohs) is harder than the ruby (9 Mohs).
Composition : The ruby is a variety of corundum, while the diamond is made of pure carbon.
Price : A ruby, although expensive, is still more affordable than a red diamond.

The red diamond and the other colored diamonds

The red diamond is even rarer than the blue diamonds and roses, which are already extremely popular. The colored diamonds the rarest include:

The purple diamond
The green diamond
The orange diamond

How to buy a red diamond ?

Where to find a red diamond ?

Red diamonds are only available at certain prestigious diamond dealers, like Celinni, which offers exceptional custom-made jewelry.

Selection criteria

When buying a red diamond, it is essential to check:

The certification (GIA or HRD)
The color and the purity
The carat weight
The authenticity and provenance

Red diamond jewelry: an exclusive trend

Red diamond rings are the most sought after among high jewelry enthusiasts. They represent a symbol of prestige and passion. Some jewelers, like Celinni, offer exclusive designs for these exceptional stones.

Red diamond rings

Red diamond solitaire ring : A unique piece for special occasions.
Red diamond alliance : A rare jewel for an unforgettable union.

Red Diamonds Rail Alliance

À partir de €1,830.00 -30% À partir de €1,281.00

-30%

Red Diamonds Alliance 4 Grains

À partir de €1,839.00 -30% À partir de €1,287.30

-30%

Ruby Rail Baguettes Alliance

À partir de €7,389.00 -30% À partir de €5,172.30

-30%

Diamond and Ruby Rail Alliance Baguettes

À partir de €8,150.00 -30% À partir de €5,705.00

-30%

Necklaces and pendants : Carried by great personalities.
Earrings : Sophisticated creations for incomparable brilliance.

FAQ about red diamonds

Why is the red diamond so expensive ?
The red diamond is extremely rare, with only a few specimens discovered each year. Its rarity, unique formation, and demand among collectors and investors explain its very high price.

What is the difference between a red diamond and a ruby ?
The red diamond is a variety of diamond, composed only of crystallized carbon, while the ruby is a variety of corundum containing chromium. The red diamond is much rarer and generally much more expensive than the ruby.

Where to buy a certified red diamond ?
Certified red diamonds can be purchased from reputable diamond dealers like Celinni, who offer authentic stones accompanied by recognized expertise certificates.

How is the price of a red diamond determined ?
The price of a red diamond depends on its weight in carats, its color intensity, its purity, and its origin. The more intense and uniform the color, the more expensive the stone will be.

What are the most beautiful known red diamonds ?
Among the most famous red diamonds are the Moussaieff Red Diamond (5.11 carats), the Kazanjian Red Diamond (5.05 carats), and the Hancock Red Diamond (0.95 carat), all extremely rare and prized.

Conclusion

The red diamond is undoubtedly one of the rarest and most expensive gemstones in the world. Its fascinating color, unique formation, and extreme rarity make it a gem coveted by collectors and jewelry enthusiasts. At Celinni, we put our expertise at your service to offer you exceptional and custom-made jewelry, paying tribute to the timeless beauty of these rare diamonds.