What Is a Diamond?

Diamond is a crystalline form of carbon in which carbon atoms are arranged in a three-dimensional crystal structure. This structure gives diamond its exceptional hardness and contributes to its optical properties.

Natural diamonds form deep within Earth under high pressure and temperature over geological timescales. They are brought closer to the surface through volcanic rocks known as kimberlite and, in some regions, related geological deposits. The Gemological Institute of America (GIA) explains that diamond’s properties arise from its crystal structure and composition.

The 4Cs of Diamond Quality

The internationally recognised framework of Cut, Colour, Clarity and Carat Weight is widely used to describe diamond quality. The four factors interact, so one characteristic should not be considered in isolation.

Carat weight measures mass, not visual quality. Two diamonds with the same carat weight can have substantially different appearance, cut quality and value.

Reference: GIA Diamond Quality Factors.

Diamond Shape vs Diamond Cut

Shape describes the outline of a polished diamond, such as round brilliant, oval, pear, emerald, cushion or princess. Cut describes the quality of the diamond’s proportions, symmetry, polish and light performance.

Natural Diamond vs Laboratory-Grown Diamond

Natural and laboratory-grown diamonds share the same fundamental chemical composition and crystal structure, but their origins are different. Natural diamonds form through geological processes inside Earth. Laboratory-grown diamonds are produced using controlled technological processes, commonly HPHT or CVD.

Laboratory-grown does not mean imitation: a laboratory-grown diamond is diamond material. However, it should be clearly disclosed as laboratory-grown rather than represented as a mined natural diamond.

Learn more from GIA’s laboratory-grown diamond research.

Diamond Colour: From Colourless to Fancy Colour

For many white diamonds, the GIA D-to-Z scale describes increasing traces of yellow or brown body color. D represents the highest color grade in that scale. Diamonds with noticeable natural hues such as yellow, pink, blue or green can fall into the fancy-color diamond category and are evaluated using different criteria.

Colour perception is affected by lighting, setting and surrounding materials. When comparing diamonds online, use consistent photography and, for important purchases, a recognised laboratory report.

Diamond Clarity Explained

Natural diamonds commonly contain tiny internal characteristics and surface features. The clarity scale considers the number, size, relief, nature and position of characteristics when viewed under standardised conditions.

Clarity does not mean “perfect” versus “bad.” Many diamonds with inclusions that are difficult to see without magnification can appear beautiful in normal viewing. The practical goal is to understand what is present and whether it affects transparency, durability or appearance.

What Determines Diamond Price?

Diamond pricing is influenced by the combination of the 4Cs, shape, fluorescence, proportions, finish, laboratory report, market conditions and whether the diamond is natural or laboratory-grown. Fancy-color diamonds are evaluated under a different framework, where hue, tone, saturation and color distribution can be especially important.

There is no single universal retail price for a diamond. Compare stones with similar specifications and verify the grading information before comparing prices.

Diamond Origin and Responsible Buying

Diamond sourcing can matter for consumers who want greater transparency about supply chains and environmental or social considerations. The Kimberley Process was established to help prevent trade in rough diamonds used to finance armed conflict, while individual companies and certification systems may provide additional sourcing information.

For a purchase where provenance is important, ask the seller what documentation and sourcing information they can provide. Do not assume that a generic “conflict-free” statement alone answers every ethical or provenance question.

Reference: Kimberley Process.

Diamonds in Rings, Earrings and Necklaces

Diamond’s hardness of 10 on the Mohs scale makes it highly resistant to scratching, which is one reason it is widely used in jewellery. Toughness and durability are not identical to hardness, so settings still need appropriate care.

Diamond rings

Rings receive frequent contact with surfaces. Check prongs and settings periodically, and avoid exposing jewellery to harsh impacts.

Diamond earrings and pendants

These formats can reduce direct contact with hard surfaces while allowing the diamond to remain the focal point of the design.

How to Care for a Diamond

Regular cleaning helps remove oils and residue that can reduce sparkle. A gentle approach using warm water, mild dish soap and a soft brush is commonly suitable for many diamond jewellery pieces.

• Clean gently and rinse thoroughly.
• Store diamonds separately from softer jewellery to reduce scratching.
• Have settings inspected periodically, especially for rings.
• Ask a jeweller before using ultrasonic or steam cleaning if the diamond is treated or the setting contains delicate materials.

For professional guidance, see GIA Diamond Care & Cleaning.

How to Buy a Diamond Online

1. Decide whether you want a natural or laboratory-grown diamond.
2. Choose your preferred shape before comparing individual stones.
3. Set a budget and compare the 4Cs within that budget.
4. Review the laboratory report and verify the report details.
5. Check measurements, proportions, fluorescence and any treatment disclosure.
6. Compare several diamonds with similar specifications rather than judging by carat weight alone.
7. Read the seller’s return, warranty and shipping terms before purchasing.

Explore Diamonds and Natural Gemstones

Continue exploring GemsVault for gemstone education and current gemstone listings. Browse our existing guides on Ruby, Larimar, Sapphire, Opal and Cabochon Gemstones.

Diamond FAQ