Ask the Chatbot Games & Quizzes ProCon History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture Money Videos
Jonker diamond
Table of Contents
Introduction References & Edit History
Discover
Mayer Amschel Rothschild (1744-1855), founder of the house of Rothschild; lithograph by Friedrich Lieder, c. 1830.
Where Do Anti-Semitic Conspiracy Theories About the Rothschild Family Come From?
Santa Claus flying in his sleigh, christmas, reindeer
Was Santa Claus a Real Person?
Thanksgiving Celebration Traditional Dinner Setting Food Concept
Why Is Thanksgiving in the U.S. Celebrated on a Thursday?
Rural Irish landscape, Sligo, Ireland.
Why Is Ireland Two Countries?
John F. Kennedy as a boy with his family
What Did We Call America’s Elite Before the “1 Percent”?
Thanksgiving Turkey with all the sides
Why Do We Eat Turkey on Thanksgiving?
Artist interpretation of a Space meteoroid impact. Meteor impact. Asteroid, End of the world, danger, destruction, dinosaur extinct, Judgement Day, Planet Earth, Doomsday Predictions, comet
10 Failed Doomsday Predictions

Jonker diamond

gem
verifiedCite
While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any questions.
Select Citation Style
Share
Share to social media
URL
https://www.britannica.com/topic/Jonker-diamond
Feedback
Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login).
Thank you for your feedback

Our editors will review what you’ve submitted and determine whether to revise the article.

External Websites
Written and fact-checked by
The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.
The Editors of Encyclopaedia Britannica
Article History

Jonker diamond, white diamond tinged with blue that weighed 726 carats in rough form. It was named for the prospector Jacobus Jonker after the stone was found in 1934 on a farm near Pretoria, S.Af. After a year of study, it was cleaved by the New York cutter Lazare Kaplan into 13 stones ranging in weight from about 5 carats to an emerald-cut stone of about 143 carats. It was the first great diamond to be cut in the United States.

This article was most recently revised and updated by John P. Rafferty.