Imagine finding a rough diamond so extraordinary that experts spend nearly two years deciding how to cut it. That is exactly what happened with the world’s largest square emerald cut diamond—the remarkable Graff Lesedi La Rona. Weighing 302.37 carats, this breathtaking gemstone represents one of the greatest achievements in modern diamond cutting.
Its journey began as the famous 1,109 carat Lesedi La Rona rough diamond, discovered in Botswana. Today, the polished masterpiece has earned worldwide recognition for its exceptional size, remarkable quality, and precision craftsmanship. It also stands among the largest emerald cut diamonds and one of the finest diamonds ever certified by the Gemological Institute of America (GIA).
In this guide, you’ll learn how the diamond was discovered, why it is historically significant, how experts transformed it into a flawless masterpiece, its value, ownership, and the fascinating facts that continue to make it one of the world’s most celebrated luxury diamonds.
From a 1,109-Carat Rough Diamond to a 302.37-Carat Masterpiece
The story begins in November 2015, when Lucara Diamond Corp. recovered a spectacular 1,109-carat rough diamond from the Karowe Mine in Botswana.
At the time, it became the second-largest gem-quality rough diamond ever discovered after the legendary Cullinan Diamond found in 1905.
The name Lesedi La Rona comes from the Setswana language and means “Our Light.” The name was selected through a nationwide competition in Botswana, reflecting the country’s pride in one of its greatest natural treasures.
Unlike many rough diamonds that head directly to a cutting facility, this exceptional stone underwent extensive scientific analysis. Specialists used advanced imaging technology to map every internal inclusion and crystal structure before making a single cut.
That planning stage alone lasted almost two years.
How Graff Acquired the Lesedi La Rona Diamond
In 2017, luxury jeweler Graff Diamonds, led by Laurence Graff, purchased the rough stone from Lucara Diamond for US$53 million.
Rather than rushing the process, Graff assembled a team of highly experienced gemologists, engineers, and master cutters.
Every decision carried enormous risk.
One incorrect cut could have destroyed millions of dollars in value. Instead, Graff invested months studying the diamond using optical scanning, computer modeling, and traditional craftsmanship before beginning the cutting process.
The patience paid off.
Lesedi La Rona Before and After Cutting
Transforming the 1109 carat Lesedi La Rona rough diamond into polished diamonds required extraordinary precision.
The original crystal produced several polished diamonds, but the most famous became the Graff Lesedi La Rona diamond, weighing 302.37 carats.
Although many people focus on the reduction in weight, that is completely normal in diamond cutting. The objective is not to preserve maximum size but to maximize beauty, brilliance, clarity, and long-term value.
Think of it like sculpting a masterpiece from a giant block of marble. The finished artwork weighs less, yet becomes far more valuable.
Why the World’s Largest Square Emerald Cut Diamond Is Historically Significant
The 302.37 carat diamond holds multiple records that make it unique.
It is the world’s largest square emerald cut diamond
No other polished square emerald cut diamond matches its size.
This achievement alone places the Graff Lesedi La Rona among the most important gemstones ever fashioned.
It showcases exceptional modern craftsmanship
Cutting a stone this large requires balancing weight retention with optical performance.
The emerald cut does not hide imperfections as well as brilliant cuts. Instead, its broad step facets reveal the diamond’s clarity. That means cutters must work with extraordinary precision.
It demonstrates advances in diamond technology
Modern laser mapping and computer analysis helped experts understand the diamond’s internal structure before cutting.
Even with advanced technology, human expertise remained essential throughout the process.
GIA Certification and Diamond Quality
One reason the Graff Lesedi La Rona receives so much attention is its remarkable quality.
The diamond received the following prestigious grading from the Gemological Institute of America (GIA):
- Weight: 302.37 carats
- Shape: Square Emerald Cut
- Color Grade: D Color
- Clarity Grade: VVS1
- Diamond Type: Type IIa
D Color Diamond
D represents the highest possible color grade.
It means the diamond is completely colorless, allowing maximum light transmission and exceptional visual beauty.
VVS1 Clarity
A VVS1 diamond contains extremely tiny inclusions that remain difficult for skilled graders to detect under 10× magnification.
For a diamond exceeding 300 carats, achieving this clarity level is exceptionally rare.
Type IIa Diamond
The Graff Lesedi La Rona belongs to the rare Type IIa diamond category.
Type IIa diamonds contain extremely low levels of nitrogen impurities, making them some of the purest natural diamonds ever discovered.
Many of history’s most famous diamonds belong to this exclusive group.
How Big Is the Graff Lesedi La Rona?
Numbers alone rarely tell the full story.
At 302.37 carats, the Graff Lesedi La Rona is significantly larger than almost every polished diamond displayed in museums or luxury collections worldwide.
Its carefully balanced square emerald cut emphasizes long, elegant step facets rather than intense sparkle.
Instead of producing countless flashes of light like a round brilliant, an emerald cut creates broad reflections often called the “hall of mirrors” effect.
That sophisticated appearance has made emerald cut diamonds especially popular among collectors who appreciate clarity and elegance over maximum brilliance.
Graff Lesedi La Rona Value and Price
One of the most common questions people ask is:
How much is the Graff Lesedi La Rona worth?
Graff purchased the original rough diamond for US$53 million in 2017.
However, Graff has never publicly disclosed the value or selling price of the finished 302.37-carat polished diamond.
Because of its unique characteristics, rarity, historical importance, and exceptional grading, experts generally consider it virtually priceless.
Unlike commercial diamonds, stones of this significance rarely have a standard market value because no direct comparison exists.
Who Owns the Graff Lesedi La Rona Diamond?
Another frequently searched question is:
Who owns the Graff Lesedi La Rona diamond?
The polished diamond is owned by Graff Diamonds.
The company has displayed the gemstone internationally as part of its prestigious collection of exceptional diamonds.
As of today, Graff has not announced any public sale of the stone.
Is Graff Lesedi La Rona for Sale?
There is no public evidence that the Graff Lesedi La Rona is currently for sale.
Exceptional diamonds of this importance often remain part of a jeweler’s historic collection rather than entering the open market.
They serve as symbols of craftsmanship, prestige, and innovation.
Why Is Graff Lesedi La Rona Famous?
Several factors make this one of the world’s most celebrated diamonds.
Record-breaking size
It remains the largest square emerald cut diamond ever created.
Extraordinary origin
It came from the famous Karowe Mine in Botswana, one of the world’s leading sources of exceptional large diamonds.
Exceptional quality
Its combination of D Color, VVS1 clarity, and Type IIa purity is extraordinarily rare at this size.
Historic craftsmanship
The cutting process required years of planning and showcased some of the highest levels of gemstone craftsmanship ever demonstrated.
Which Diamond Is Bigger: Cullinan or Lesedi La Rona?
The comparison often creates confusion.
Rough Diamond Comparison
| Diamond | Rough Weight |
|---|---|
| Cullinan Diamond | 3,106 carats |
| Lesedi La Rona | 1,109 carats |
The Cullinan Diamond remains the largest gem-quality rough diamond ever discovered.
Polished Diamond Comparison
The Cullinan rough produced several famous polished diamonds, including the Cullinan I, which weighs 530.2 carats.
The Graff Lesedi La Rona weighs 302.37 carats, making it smaller than Cullinan I but still the world’s largest square emerald cut diamond.
Each diamond holds its own unique historical importance.
Graff Famous Diamonds and Its Legacy
The Graff diamond collection includes some of the world’s most extraordinary gemstones.
Over several decades, Laurence Graff has acquired, restored, recut, and preserved numerous historic diamonds.
The addition of the Graff Lesedi La Rona further strengthened Graff’s reputation as one of the leading names in luxury diamonds and exceptional gemstone craftsmanship.
Fascinating Graff Lesedi La Rona Facts
Here are some verified facts that make this diamond remarkable:
- It originated from the Karowe Mine in Botswana.
- The rough diamond weighed 1,109 carats.
- It became the second-largest gem-quality rough diamond discovered in modern history.
- The polished centerpiece weighs 302.37 carats.
- It is the world’s largest square emerald cut diamond.
- It received D Color and VVS1 clarity from GIA.
- It belongs to the exceptionally rare Type IIa diamond category.
- Graff purchased the rough diamond for US$53 million in 2017.
- The name Lesedi La Rona means “Our Light” in Setswana.
Why This Diamond Matters Beyond Luxury
The Graff Lesedi La Rona is more than an expensive gemstone.
It represents the intersection of geology, engineering, artistry, and patience.
Nature spent billions of years creating the crystal beneath the Earth’s surface. Modern technology revealed its internal structure. Skilled artisans then transformed it into one of history’s greatest polished diamonds.
That combination explains why collectors, gemologists, and jewelry enthusiasts continue to study it years after its creation.
Few diamonds tell such a complete story from discovery in Botswana to becoming a record-breaking masterpiece admired around the world.
Frequently Asked Questions
What is the world’s largest square emerald cut diamond?
The Graff Lesedi La Rona, weighing 302.37 carats, is recognized as the world’s largest square emerald cut diamond.
Where was the Lesedi La Rona diamond discovered?
It was discovered at the Karowe Mine in Botswana in November 2015.
What does Lesedi La Rona mean?
Lesedi La Rona means “Our Light” in the Setswana language.
How big is the Graff Lesedi La Rona?
The polished diamond weighs 302.37 carats, while the original rough crystal weighed 1,109 carats.
Who owns the Graff Lesedi La Rona diamond?
The diamond is owned by Graff Diamonds.
How much is the Graff Lesedi La Rona worth?
Graff bought the rough diamond for US$53 million, but the company has never publicly disclosed the value of the finished polished stone.
Is the Graff Lesedi La Rona GIA certified?
Yes. GIA graded the diamond as D Color, VVS1 Clarity, and Type IIa.
How long did it take to cut the Lesedi La Rona?
Graff spent nearly two years studying and planning the cutting process before completing the polished diamonds.
Conclusion
The world’s largest square emerald cut diamond, the 302.37ct Graff Lesedi La Rona, stands as one of the finest achievements in modern gemology. Born from the legendary 1,109-carat Lesedi La Rona rough diamond, it combines extraordinary size with exceptional quality, earning a D Color, VVS1 clarity, and Type IIa classification from GIA.
Its journey from Botswana’s Karowe Mine to the Graff collection highlights the importance of patience, precision, and craftsmanship. While many famous diamonds are known for their size alone, the Graff Lesedi La Rona stands apart because it balances record-breaking dimensions with remarkable beauty and historical significance.
For anyone interested in famous diamonds, gemstone craftsmanship, or the history of exceptional natural diamonds, the Graff Lesedi La Rona remains one of the most impressive examples ever created.
