Most Expensive Diamonds No.3 - The Cullinan Diamond
A clear, expert guide from the Monroe Yorke Diamonds team.
This is the Cullinan I Diamond at $400million, and No 3 in the Monroe Yorke Diamonds' most expensive diamonds of the world.
Again, this superb diamond is an exquisite gem discovered at the Premier Diamond mine in South Africa, and is the largest rough stone ever found.
When found the uncut stone was a staggering 3,106.75 carats (621.35 grams) Many know the diamond as the Great Star of Africa and is 530.4 carats (106.1 grams).
The Cullinan I Diamond is now mounted in the head of The Sceptre with the Cross. The large rough diamond was cut into nine smaller pieces, the Cullinan I being the larger part. The Cullinan II, a smaller section of the rough stone is the fourth largest diamond in the world. Known as The Little Star of Africa it weighs 63.5 grams -317.4 carats. Both of these stunning gems are mounted in the Crown Jewels of the British Royal Family.
Nine Stunning Diamonds Cut from the Cullinan Diamond
Written & reviewed by the Monroe Yorke Diamonds team
We have spent 20 years helping Australians choose diamonds, with appointment-only studios in Sydney, Melbourne, Brisbane and Perth.
Frequently asked questions
Ready to find your ring?
Browse the collection, or book a private appointment and let our specialists guide you.
Buying Guide
03 Jun 2026
Diamond Quality Facts
Every diamond is unique. This is a beautiful fact about the most exquisite mineral in the world. They are not...
22 Sep 2025
The Strategic Purchase: Choosing Between a Loose Diamond and a Pre-Set Ring
The Strategic Purchase: Choosing Between a Loose Diamond and a Pre-Set Ring Choosing the perfect engagement ring is a deeply...
22 Sep 2025
The Definitive Guide to Lab-Grown Diamonds
The world of diamonds is evolving, and lab-grown diamonds are at the forefront of this new era of conscious luxury....
