The World's Most Unusual Double Diamond
Key Takeaways
- The double diamond (diamond within a diamond) is an extremely rare natural phenomenon, recorded as a small diamond lying freely inside the core of a larger diamond. Recently, a 0.85-carat double diamond, formed...
The double diamond (diamond within a diamond) is an extremely rare natural phenomenon, recorded as a small diamond lying freely inside the core of a larger diamond. Recently, a 0.85-carat double diamond, formed about 1.4 billion years ago at a depth of 200km, was discovered at the Ellendale mine (Western Australia) – a place famous for the world's most exquisite yellow diamonds.
This article will take you to explore the magical beauty of this unique gem and review the rarest diamonds in human history.
The Only Double Diamond
A 0.85-carat diamond containing a smaller diamond at its inner core was discovered at the Ellendale diamond mine, Kimberley region, Western Australia, ABC News reported on November 26. This gem is believed to have formed 1.4 billion years ago, about 200 km below the Earth's surface.
Unlike stones with common impurities, the double diamond at the Ellendale mine possesses a unique structure similar to Russian Matryoshka dolls.
- Special Structure: A small void within the large diamond contains a smaller diamond.
- Phosphorescence: When exposed to ultraviolet light, this stone emits a rare purple glow – a characteristic similar to the legendary "Hope Diamond".
- Historical Value: Found at a depth of 200km below the Earth's surface, the stone is evidence of harsh geological upheavals from billions of years ago.

The only double diamond found in Australia
Rarest Diamonds in the World
Rare diamonds are still found all over the world with many geologists and gemologists working to discover these gems.
The Cullinan Diamond
The Cullinan Diamond is the largest diamond ever discovered. It weighs 3,106.75 carats and is nicknamed "the most famous diamond in the world." The Cullinan Diamond was found in 1905 at the Premier Mine in South Africa by Frederick Wells, a mining engineer. It was named after his employer, Sir Thomas Cullinan.
The diamond was misidentified as a 5-carat stone and was not considered the largest known diamond until 18 months after receiving an official certificate from England.

The largest rough diamond ever discovered (South Africa).
The Mountain of Light Diamond (KOH-I-NOOR)
Koh-I-Noor is the Arabic name for a diamond called the Mountain of Light. The most expensive diamond in the world, it was gifted to Queen Victoria as a wedding present in 1850 and has been on display at the Tower of London ever since. The most famous of its owners was Napoleon III, who placed it on the crown his wife Josephine wanted to wear at her coronation.

Symbolizing power, it is now on the British Crown Jewels.
See more: The Light Refraction Ability of Diamonds
The De Beers Centenary Diamond
The De Beers Centenary Diamond is the third largest diamond in the world, weighing 273.85 carats. This diamond was discovered in 1988 and is now part of a heart-shaped diamond weighing 599 carats.

A diamond with exceptional clarity.
The Pink Star Diamond
In 2017, the Pink Star diamond broke the auction price record for a gemstone set by the Oppenheimer blue diamond. It weighs 59.6 carats and has a natural pink color with a fancy cut.

The natural pink diamond holds the record for the highest auction price in the world.
The Regent Diamond
If you have the chance to visit France, you can admire the dazzling Regent diamond on display at the Louvre Museum. The history of this gem has passed through many owners and it now belongs to the French state.

The dazzling stone is on display at the Louvre Museum (France)
Where to buy reputable, quality diamonds?
Jemmia Diamond is a GIA-authorized diamond expert, committed to bringing sustainable value and absolute transparency to customers:
- Transparent Legal Status: 100% diamonds are officially imported, with full invoices and GIA certificates.
- Quality: Strictly selects the top 2% of the world's most beautiful diamonds, does not use diamonds with flaws affecting durability and structure.
- Modern Technology: Jemmia uses 100% imported technology equipment from GIA USA, including GIA iD100, GIA Diamond Dock, GIA Match iD… to verify the quality and origin of each diamond.
- Ethical Sourcing: Only distributes clean diamonds, adhering to the Kimberley Process.
- Good Prices & Policies: Public, transparent price list; optimal buy-back and trade-in policies in the market.

Reputable diamond purchasing address
The double diamond and legends like Cullinan or Koh-I-Noor are testaments to the infinite magic of nature. Owning a diamond is not only investing in a precious asset but also owning a work of art of time. Come to Jemmia Diamond to be consulted by experts and choose your most perfect diamond.