A diamond may look delicate in a fine setting, yet the crystal itself began its journey far below Earth’s surface. Its story connects deep geological processes with ancient Indian trade, changing mining centres and the choices people make when buying jewellery today. Understanding that story also helps explain why a diamond is exceptionally hard but not impossible to damage.
Ancient India and the early diamond trade
For much of recorded history, India was the principal known source of diamonds. Crystals were recovered from alluvial deposits—sand and gravel left behind by rivers and weathering—rather than from the deep, narrow volcanic pipes that supply many modern mines. Indian deposits became part of long-distance trade, carrying diamonds beyond the subcontinent through changing networks of merchants and intermediaries.
Ancient writers in the Mediterranean world knew of Indian diamonds, though early accounts can mix observation with legend and are not always reliable descriptions of where individual stones came from. In later centuries, Golconda became a celebrated diamond-trading centre. The name is often used broadly in jewellery history, but it is important to distinguish a trading centre from a mine: not every diamond sold through Golconda was necessarily mined nearby.
Diamonds also held cultural meaning. In India and elsewhere, people associated precious stones with status, protection, power or auspiciousness. Such associations belong to history and traditional belief, not to scientific evidence that a diamond produces a particular outcome. The stone’s enduring appeal also has a practical explanation: its brilliance, rarity in particular qualities and ability to be fashioned for jewellery.
How diamonds form inside Earth
Diamond is a crystalline form of carbon. Most natural diamonds formed under very high pressure and temperature in Earth’s mantle, commonly at depths of roughly 140 to 200 kilometres or more. Their formation took place over geological timescales; some diamonds are billions of years old, though ages vary from stone to stone. Diamonds do not all share one formation history, and their age is not the same as the age of the rock that later carried them towards the surface.
A diamond’s journey upward is usually associated with powerful volcanic eruptions. Kimberlite and, less commonly, lamproite magmas can transport mantle material towards the surface. If the journey is relatively rapid, some diamonds survive the changing conditions. Once exposed, the surrounding rock may weather away, leaving crystals to be moved by water into alluvial deposits.
This geology helps explain the changing map of diamond supply. As exploration and mining developed, significant sources were found in places including southern Africa, Russia, Canada and Australia. The discovery of diamond-bearing deposits in southern Africa during the nineteenth century transformed the scale and organisation of the trade. Today, diamonds may come from several producing regions and from different types of deposits. A stone’s origin should not be guessed from its appearance alone.
From rough crystal to polished gem
A rough diamond is not automatically a brilliant, symmetrical gemstone. Cutting and polishing require careful decisions about shape, proportions, inclusions and the direction in which the crystal can be worked. The cutter must balance the finished stone’s light performance against the weight that will be lost in shaping it. Traditional Indian diamond expertise has also contributed to the modern jewellery industry, including through cutting and polishing work.
The familiar round brilliant cut is designed to return light to the viewer, but diamonds are fashioned in many shapes. A well-cut stone can appear lively and bright, while a diamond’s appearance also depends on lighting, setting, cleanliness and the viewer’s preferences. Cut is not the same thing as shape: “round” describes a shape, while cut quality concerns the proportions and finish of a fashioned stone.
What diamond durability really means
Diamond ranks 10 on the Mohs scale of mineral hardness, making it the hardest naturally occurring mineral on that scale. Mohs hardness describes resistance to scratching, not resistance to every kind of damage. A diamond can scratch many materials, but a sharp impact may chip or fracture it. Diamonds have cleavage directions—planes along which the crystal can split—so a blow in the wrong place can cause damage even though the stone is exceptionally hard.
That distinction matters in daily wear. A diamond ring can be vulnerable if its stone projects above the setting or catches against a hard surface. Prongs and other settings can loosen with wear, allowing a stone to move or fall out. Hardness also means a loose diamond can scratch other jewellery, so store pieces separately rather than letting them rub together.
For routine care, use warm water, mild soap and a soft brush, then rinse carefully and dry with a soft cloth. Check that the drain is closed before cleaning over a sink. Avoid harsh chemicals and use caution with household ultrasonic cleaners: some diamonds may contain inclusions or have treatments, and certain settings or nearby stones may not be suitable for ultrasonic cleaning. If a diamond is loose, chipped or set in delicate jewellery, ask a qualified jeweller about appropriate cleaning and inspection.
Buying a diamond with clear information
A useful starting point is the four Cs: carat weight, colour, clarity and cut. Carat measures weight, not visible size alone. Colour grading describes how close a diamond is to colourless within a grading system; clarity considers internal features and surface characteristics; and cut assesses how a fashioned diamond’s proportions and finish influence its appearance. These factors interact, so a larger carat weight does not by itself guarantee a more beautiful stone.
Ask whether the diamond is natural or laboratory-grown. Both are diamond, with the same basic chemical composition and crystal structure, but they have different origins and market contexts. A simulant such as cubic zirconia may resemble diamond but is a different material. Clear disclosure helps buyers understand what they are considering.
For a significant purchase, request written product details and, where applicable, an independent grading report that corresponds to the stone. A grading report is not the same as a guarantee of ethical sourcing, and a report’s scope depends on the issuing organisation. Buyers concerned about provenance can ask what origin information is available and what it does—and does not—establish. The Kimberley Process, for example, is an international system focused on trade in rough diamonds and conflict concerns; it should not be treated as proof of every aspect of a diamond’s ethical or environmental history.
In Solapur, as anywhere, compare jewellery in suitable light, ask questions in plain language and make sure the invoice describes the item accurately. Consider the setting, intended use and maintenance alongside the stone’s appearance. A diamond’s long history spans ancient Indian river deposits and modern global supply chains, but a thoughtful purchase begins with the same essentials: clear information, realistic expectations and care suited to the jewellery.
Sadhguru Gems & Jewellers AI Editorial · 9/10/2026
