Natural Diamonds

Soham Ghosh International offers an exceptional range of natural diamonds. We deal in loose diamonds, therefore, our diamonds do not come preset in any form of jewellery, hence, you can embed them in your customised jewellery. Our business model is tailored to suit our customers’ requirements. We cater to individuals and offer diamonds on a retail basis, at the same time, we cater to businesses and offer diamonds on a wholesale basis. We offer a wide range of loose diamonds, starting from 0.18 carat upto 50 carat and upwards in size, in more than 9 unique shapes. Our natural diamonds above 0.30 carat are certified. If you happen to choose diamonds under 0.30 carat, they will be non-certified, however, we can get them certified if you wish so, from an internationally recognised gemological laboratory. This service is complimentary.

To bring you the most exquisite quality diamonds, a rigorous process is conducted to analyse and grade the brilliance of each masterpiece. Professional gemologists go beyond the traditional 4C’s (Cut, Clarity, Colour and Carat Weight) to assess a diamond’s value and rarity, ensuring a perfect marriage of science, technology and pure craftmanship resulting in a beautiful diamond.

Where do Natural Diamonds come from?

Natural diamonds are formed deep in the earth under extreme pressure and high temperature as long as three billion years ago. Volcanic activity bring them to the surface where they lay in a type of volcanic rock formation known as kimberlite pipes, waiting to be mined. However, only about five percent of kimberlite pipes contain enough diamond to make them economically feasible to mine. This magnifies the rarity aspect of a natural diamond owing to its scarcity. This is precisely why natural diamonds are expensive and also have substantial future value.

Birth of a Diamond

Rough Assortment

A gemstone’s journey to becoming a timeless diamond begins from this stage. After rough diamonds are received at the facility, every stone is sorted or categorized according to its unique characteristics with regards to colour, clarity and carat weight. The expert sorters assess the potential of each rough and separate the potentially flawless diamonds from lesser quality gems.

Planning and Cleaving

Planning is one of the most significant processes in analysing and visualising how the diamond would exactly look like as a final product. Our diamond planners technically visualize all the possibilities before marking and concluding on the final shape, size and carat weight of each gemstone. Natural facets like minor inclusions are creatively planned to enhance or add value to the diamond’s overall beauty. The following step, cleaving is the separation of a piece of diamond rough into separate pieces, to be finished as separate gems. During the planning stage, diamond manufacturers identify cleavage planes and use those planes to decide how to split the diamond. Diamond manufacturers cut a groove in the diamond with a laser or saw and then split the diamond with a steel blade.

Blade Sawing and Laser

Gemstone marked by the planners is then cut into two pieces with either blade or laser sawing. Both the processes are widely used demanding a specific and specialised skill. Incorporating laser makes the process of sawing extremely precise and efficient. On the other hand, in blading, a stone-cutting saw is a thin disk made of phosphor bronze. As the saw blade rotates it continues to pick up or recharge itself with diamond dust which is the cutting agent. It can comfortably take several hours for the saw blade to cut through a 1 carat rough diamond.


Bruting is the process whereby two diamonds are set onto spinning axles turning in opposite directions, which are then set to grind against each other to shape each diamond into a round shape. This can also be referred to as girdling. The bruting process is only necessary for round brilliant diamonds, on the other hand, fancy cut stones need a different preparation.


Polishing is the name given to a process whereby the facets are cut onto the diamond and final polishing is performed. The process involves the steps of blocking, faceting and polishing. There are two phases of the polishing process, the first is blocking. The blocking stage sets the standard for how much brilliance the diamond will have. When dealing with a small diamond, the polishing process stops here. Larger diamonds continue on to the second phase, called brillianteering. A brillianteer is a diamond polishing specialist who polishes the final facets of the stone. This is the stage that ultimately determines the fire and brilliance. The brillianteer cuts an extra 40 facets onto the stone to create the round brilliant cut diamond. Even minor inconsistencies in symmetry and proportions have the potential to distinguish a sparkling diamond from a dull one.

Final Inspection

The final stage involves examining the diamond with precision to see whether the diamond meets the quality standards of the manufacturer and is graded based on the 4C’s. At this point, the decision is made whether to have the diamond assessed by a reputed and bankable independent laboratory to receive a diamond grading certificate or sell the diamond without a certification.

Clearing the Air: Certified vs Non-Certified Diamonds

Certified diamonds are those which have been graded or certified by a reputable gemological laboratory. The quality and characteristics of the diamonds have been evaluated and the results are recorded in a grading report, more popularly known as a diamond certificate. Here the most crucial thing is that the diamond certificate should be issued by an independent entity that has no association with the manufacturer, i.e., the third-party laboratory. Certified diamonds are more valuable since the grading acts as proof of authenticity and verifies that the diamond meets all quality standards. However, do not be perturbed if your jeweller does not have a certificate for the diamond you want to purchase because not all diamonds are certified since it is not mandatory. Diamond certification comes with a cost, therefore, diamonds under 0.30 carats are generally, not certified. Precisely why, certified diamonds are dearer and expensive.


Now, non-certified diamonds, on the other hand, are not put through any kind of third-party testing or formal laboratory grading. Please bear in mind that non-certified diamonds are not necessarily inferior in quality or value. It just does not make sense to get diamonds under 0.30 carats of weight graded where the price of testing will compete with the actual price of the diamond. The main criteria in purchasing non-certified diamonds is trust. Soham Ghosh International assures you of authentic non-certified diamonds, if you opt for the same. However, if you happen to choose non-certified diamonds (under 0.30 carats) and wish to get it certified, we will get them certified from an internationally recognised gemological laboratory. 

Our Certifications

Our natural diamonds (0.30 carat and upwards) have either been certified by the Gemological Institute of America (GIA) or the International Gemological Institute (IGI). If you choose diamonds under 0.30 carat and wish to get them certified, we will get them certified from either of the abovementioned gemological laboratories. This service is complimentary, you will not have to bear any additional charges for the same.

diamond exporters India
diamond exporters


Please note, the diamond authenticity certificate will be sent along with your courier.

Ethical Sourcing

We take immense pride in conveying that we engage in ethical and conflict-free business practices across our value chain :

  • Our diamonds originate from outside conflict zones where diamonds may be used to fund civil and religious wars. Diamonds are intended to be a commitment of love, not war. We ensure and validate that no rough diamond was acquired from an illegitimate source in a war-torn region. Additionally, compliance with the Kimberly Process Certification and System of Warranties are mandatory across our value chain. We solemnly advocate conflict-free diamonds.
  • It is imperative that mining practices are ethical without the abuse of human rights and civil liberties. We advocate democratic and fair labour law practices, in concurrence, with elimination of any kind of health and safety risk in processes that might threaten the lives of team members. 
  • Across our value chain, it is ensured that team members are not subjected to any form of harassment, discrimination or abuse at their workplace. Strict disciplinary regulations are have been implemented and enforced. 
  • We consider it our responsibility to leave as small a footprint on the Earth as possible so it can be protected for future generations. This is particularly relevant with diamond mining as 250 tons of rock are required to discover a single carat of diamond. The best available technology is employed across our value chain to avoid environmental sacrifice. 
  • The diamond industry employs large number of people, offer fair wages and follow fair labour practices. We believe in the act of giving back, thereby, aspire to create opportunities to that empower people personally, financially and professionally.

Our Range

  • FL to I3 Clarity
  • D to M Colour
  • 0.18 to 50+ Carat
  • 9+ unique shapes

Please contact us for natural diamonds