Diamonds are formed by high-pressure high-temperature (HPHT) processes that naturally occur deep within the Earth. The exact temperature and pressures at which these processes occur naturally is not known, but we can get a pretty good idea by comparing the temperatures used when using artificial HPHT means to manufacture synthetic diamonds. It seems that temperatures of approximately 5000°C and pressures of around 100,000 atmospheres are needed - and such temperatures and pressures occur nowhere on the surface on the Earth, nor anywhere in the outer layer of the Earth, known as the crust.
It is thus thought that natural diamonds are created within the Earth's mantle (this view is reinforced by the fact that a pressure of 100,000 atmospheres is equivalent to that of 200 miles of rock). Most of the diamonds formed in this way, probably never reach or approach the surface, but just sometimes they are exploded towards the surface in fissures. These fissures tend to become circular near the surface, are known as "pipes", and are composed of the mineral kimberlite.
In some diamond mining regions, diamonds are mined directly from the kimberlite pipes. However, kimberlite, like other minerals is liable to weathering and erosion, and hence in other diamond mining regions, diamonds may be found in locations where the alluvial deposits from erosion are found - such as beaches, deltas, river and stream beds, and former river and stream beds.
Here is a list of some the most important diamond mining regions around the world:
Please share your comments on this page.
Guide 2 Diamonds
Diamond Clarity Enhancements
Diamond Color Grading
Diamond Scams & Tricks
What are Diamonds?
Note: Our company and this web site does NOT sell jewelry or gems. Any and all jewelry or gems that may appear on, or be linked from, this website, is an advertisement for a product sold by a third party. Please be sure to read product descriptions carefully, and do appropriate research and due diligence before purchasing jewelry or gems or other products. Sorry, we are NOT able to answer questions about jewelry or gems or third party products/websites.
Copyright © 2006-2020, Answers 2000 Limited
CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON SERVICES LLC. THIS CONTENT IS PROVIDED 'AS IS' AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
CERTAIN CONTENT THAT APPEARS ON THIS SITE,COMES FROM AMAZON EU S.à r.l. THIS CONTENT IS PROVIDED 'AS IS' AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
Disclosure: Our company's websites' content (including this website's content) includes advertisements for our own company's websites, products, and services, and for other organization's websites, products, and services. In the case of links to other organization's websites, our company may receive a payment, (1) if you purchase products or services, or (2) if you sign-up for third party offers, after following links from this website. Unless specifically otherwise stated, information about other organization's products and services, is based on information provided by that organization, the product/service vendor, and/or publicly available information - and should not be taken to mean that we have used the product/service in question. Additionally, our company's websites contain some adverts which we are paid to display, but whose content is not selected by us, such as Google AdSense ads. For more detailed information, please see Advertising/Endorsements Disclosures
Click privacy for information about our company's privacy, data collection and data retention policies, and your rights.
In Association With Amazon.com
Answers 2000 Limited is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.
In Association With Amazon.co.uk
Answers 2000 Limited is a participant in the Amazon EU Associates Programme, an affiliate advertising programme designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.co.uk.
As an Amazon Associate, our company earns from qualifying purchases. Amazon, the Amazon logo, Endless, and the Endless logo are trademarks of Amazon.com, Inc. or its affiliates.
All trademarks are property of their respective owners.
All third party content and adverts are copyright of their respective owners.