Choosing between a lab-grown diamond and an earth-formed diamond is a personal decision. Both are genuine diamonds, both can display exceptional brilliance and beauty, and both are available in a wide range of shapes, sizes and quality grades. The principal difference between them is their origin.
Earth-formed diamonds are created naturally deep within the Earth over immense periods of time. Lab-grown diamonds are produced in controlled conditions using advanced technology that recreates the circumstances in which diamonds develop. Understanding what they share, and how they differ, can help you decide which feels right for you.
Are lab-grown diamonds real diamonds?
Yes. A lab-grown diamond is a real diamond. It has essentially the same chemical composition, crystal structure and physical properties as an earth-formed diamond.
Both consist principally of carbon arranged in a diamond crystal structure. They possess the hardness, transparency, brilliance and fire associated with diamond and are suitable for fine jewellery, including engagement rings, wedding rings, earrings, pendants and bracelets.
Lab-grown diamonds should not be confused with diamond simulants. Materials such as cubic zirconia and moissanite may resemble diamonds, but they have different chemical and physical properties. A lab-grown diamond is not an imitation: it is a diamond with a laboratory origin.
How are earth-formed diamonds created?
Earth-formed diamonds developed naturally beneath the Earth’s surface under conditions of intense heat and pressure. Their formation took place over extraordinarily long periods, with many diamonds believed to be hundreds of millions or even billions of years old.
Natural geological activity eventually carried some of these crystals closer to the surface, where they could be recovered through mining. Each earth-formed diamond is the result of a rare combination of natural conditions and an immense geological journey.
For many people, this origin is central to the diamond’s appeal. Its age, rarity and connection with the natural world give it a significance that extends beyond its visible appearance.
How are lab-grown diamonds created?
Lab-grown diamonds are produced using one of two principal methods: High Pressure High Temperature, known as HPHT, or Chemical Vapour Deposition, usually abbreviated to CVD.
HPHT recreates the high-pressure, high-temperature conditions associated with the formation of diamonds beneath the Earth. A small diamond seed is exposed to carefully controlled heat and pressure, allowing additional carbon to crystallise around it.
CVD takes place within a sealed chamber containing a carbon-rich gas. Energy is used to release carbon atoms from the gas, and these gradually build upon a diamond seed to form a crystal.
After growth, the rough diamond is cut and polished using the same specialist skills and techniques applied to earth-formed diamonds.
Can you see the difference?
A lab-grown diamond and an earth-formed diamond of comparable quality can appear identical to the unaided eye. Their origin cannot usually be established by looking at the finished jewellery, even by someone familiar with diamonds.
Specialist gemmological equipment can detect growth features and other characteristics that distinguish one origin from the other. Independent grading laboratories use these methods to identify diamonds accurately.
Inclusions can occur in both types of diamond. Earth-formed diamonds may contain features created during their natural formation, while lab-grown diamonds can display characteristics associated with the method by which they were produced. These are generally examined under magnification and do not necessarily affect the diamond’s beauty.
Comparing the four Cs
Both lab-grown and earth-formed diamonds are assessed according to the four Cs: cut, colour, clarity and carat weight.
Cut describes the quality of a diamond’s proportions, symmetry and polish. It determines how effectively light travels through the stone and has a major influence on brilliance and sparkle.
Colour grading indicates how colourless a white diamond appears. The commonly used scale begins at D and continues through progressively warmer grades.
Clarity considers internal features, known as inclusions, and external features called blemishes. Many are microscopic and cannot be seen during normal wear.
Carat is a measurement of weight rather than visible diameter. Shape, proportions and cutting style can cause two diamonds of the same carat weight to appear different in size.
These quality factors apply regardless of origin. A well-cut lab-grown diamond can be more visually impressive than a poorly cut earth-formed diamond, and the reverse is equally true.
Differences in price and size
Lab-grown diamonds generally cost less than earth-formed diamonds of comparable size and quality. Their controlled production and different supply structure can make a larger diamond or higher specification accessible within the same budget.
An earth-formed diamond usually commands a higher price because of its natural rarity, the work involved in recovering it and its established position within the international diamond market.
Price alone does not determine which represents the better choice. One person may prefer to devote the available budget to a larger lab-grown diamond, while another may place greater importance on the natural origin of an earth-formed stone.
Rarity, tradition and personal meaning
Earth-formed diamonds have been used in important jewellery for generations. Their natural origin, extraordinary age and finite supply can give them a powerful emotional and symbolic appeal.
Lab-grown diamonds offer a more recent route to owning diamond jewellery. They may appeal to someone who prioritises size, specifications or the advantages of a technologically produced stone.
Neither origin carries a universal meaning. A diamond becomes significant through the occasion it represents, the person who gives it and the life in which it is worn. Personal priorities are therefore more useful than general claims about which type is superior.
Environmental and ethical considerations
The environmental impact of a diamond cannot be judged from its origin alone. Earth-formed diamond production involves mining, while growing diamonds in a laboratory requires energy, equipment and raw materials.
The effects vary considerably between individual producers. Factors may include the source of electricity, mining practices, land management, water use, working conditions and the distance travelled through the supply chain.
Broad statements that every lab-grown diamond is environmentally friendly, or that every earth-formed diamond has the same impact, are too simplistic. Anyone for whom these considerations are especially important should look for clear, specific and verifiable information about sourcing and production.
Certification and grading reports
A grading report records the independently assessed characteristics of an individual diamond. Depending on the stone and laboratory, it may include carat weight, measurements, colour, clarity, cut information, polish, symmetry and fluorescence.
The report should also state whether the diamond is lab-grown or earth-formed. Many graded diamonds carry a microscopic inscription on the girdle that corresponds with the report number and, where applicable, identifies their laboratory origin.
A grading report is not the same as a financial valuation. It describes the diamond’s gemmological characteristics but does not guarantee a particular selling price or future value.
What about resale value?
Jewellery should primarily be purchased to wear and enjoy rather than as a guaranteed financial investment. Both lab-grown and earth-formed diamond prices can change, and the amount realised through resale may be considerably below the original retail price.
Earth-formed diamonds generally have a longer-established secondary market. Lab-grown diamond prices have changed as production has expanded and technology has developed, making their future resale values difficult to predict.
If resale is an important consideration, seek independent advice and avoid relying on assumptions or promises of guaranteed appreciation.
Choosing the right diamond for you
Begin by deciding what matters most. Consider the diamond’s appearance, origin, quality, size and price, together with any personal views about rarity, tradition, production or sourcing.
Choose a well-cut diamond that looks attractive rather than concentrating on a single grade. Small differences on a certificate may be difficult to see once the diamond is mounted, while cut quality can make a noticeable difference to its beauty.
Clear product information is essential. You should know whether a diamond is lab-grown or earth-formed before buying, and any independent grading report should correspond with the stone being offered.
Two origins, one personal choice
Lab-grown and earth-formed diamonds share the qualities that make diamond such an enduring choice for fine jewellery. Both are genuine diamonds, both can be exceptionally beautiful and both can carry deep personal meaning.
Their difference lies in how they came into existence. An earth-formed diamond may be chosen for its natural rarity, age and tradition. A lab-grown diamond may be selected for the size or quality it makes possible within a particular budget.
There is no answer that suits everyone. The right diamond is the one whose appearance, origin and value feel appropriate to you, presented honestly and chosen with confidence.