Formation of Diamonds | Diamond Origin

A lot of myth and allure surrounds the true origin of a diamond. Over the years, the industry has come under direct scrutiny over its practices whilst the media coins phrases such as ‘blood diamonds’ and ‘conflict diamonds’ only compounding the negative notions surrounding the sourcing and production of this timeless gem. Unless you’re directly involved in the trade: mining, manufacturing or wholesaling, the reality of a diamond's arduous journey to the consumer's hand is somewhat of a mystery to most. Furthermore, with the popularity of synthetic or lab grown diamonds and diamond simulant alternatives on the rise, it is worth taking a look at how remarkable the journey of a natural diamond truly is. Although one article is not enough to address these issues in detail, I dig deeper by way of a story with hand drawn fun illustrations done by our in-house talented artists to help you discover how long and arduous this extraordinary process is.

Discovery

It all begins with the discovery process. Diamond mine exploration can take decades and cost billions of dollars. In 1870, large diamond deposits were discovered near Kimberly in South Africa. Africa surpasses India and Brazil as the world’s largest diamond producer.

I suggest you read this article on the History of Diamonds before coming back to continue reading below on how diamonds are transformed from rough to the sparkling polished gems we all know them to be

Mining:

Alluvial Mining

Diggers scoop up the deposited sand layers up to 60m deep to reach diamond bearing alluvial deposits, usually found in rivers or near rivers.

Kimberlite Pipe Mining

Mechanised_Diamond_Mining_in_Botswana(crop)

Mechanised methods are needed to dig deeper due to today’s high demand. High-technology drills and cranes are used to extract diamond-bearing rocks. Approximately 250 tons of ore is needed to yield just 1 carat of gem-quality diamond.

Earth Moving

Diamond bearing ore is loaded onto trucks to be transported to washing equipment and processing plants.

Crushing & Milling

The technique used to separate diamond aggregate from soil and rock (ore), along with washing, screening and heavy media separation. The softer ore is crushed leaving the heavier and harder diamond unscathed.

Grease Separation

The crushed ore is transferred to a sophisticated grease and water belt — as diamonds attract grease, the diamonds stick to the grease and the rest are washed out with high pressure water and air jets.

Chemical Wash

Rough diamond crystals are chemically cleansed to be rid of surface impurities. This is done without affecting their natural properties. Onward to sorting.

Sizing & Sorting

The rough diamonds are sorted into various sizes using sieves, pans and automated computer-aided machines.

Market Classification

The rough diamonds are then classified under the various gem and industrial categories. Over 80% of naturally occurring diamond is actually used for industrial purposes.

Cutting

The diamonds for the gem market are then cut to shape using cleaving, sawing and bruting techniques to the right proportions. This is the first step to a polished diamond that we are all familiar with.

Polishing

A facet is a tiny planar surface that traps light, disperses it and creates a sparkle. Each facet on a diamond is polished one by one to bring out its brilliance. A modern round brilliant diamond has 57 facets, all polished tirelessly by hand

4C Grading

Experts sort the diamonds further according to different categories based on carat, colour, cut and clarity. Labs such as the GIA, IGI, HRD & EGL issue unique reports for each individual diamond.