{"id":1622,"date":"2026-05-19T10:08:11","date_gmt":"2026-05-19T10:08:11","guid":{"rendered":"https:\/\/adiamondisforever.com\/en-in\/?p=1622"},"modified":"2026-05-19T10:08:12","modified_gmt":"2026-05-19T10:08:12","slug":"lab-grown-vs-natural-diamond-colour-stability","status":"publish","type":"post","link":"https:\/\/adiamondisforever.com\/en-in\/education\/lab-grown-vs-natural-diamond-colour-stability\/","title":{"rendered":"Natural diamond vs lab grown: Will the colour grade stay the same over time?"},"content":{"rendered":"\n

From the soft blush of a fancy colour pink to the icy brilliance of a D-grade white, the hue of a diamond not only determines its look but also its value and meaning. Lab grown or natural diamond, it\u2019s only right to query how steadfast its colour is and whether it\u2019s likely to change. <\/p>\n\n\n\n

Does a diamond\u2019s colour fade over time? The short answer is no. Both natural diamonds and laboratory-grown alternatives (LGDs) are generally incredibly stable when it comes to colour. That said, there are a few exceptions. Read on to discover more\u2026 <\/p>\n\n\n\n

What \u201ccolour stability\u201d means for diamond clarity and colour<\/h2>\n\n\n\n

Colour stability in a diamond refers to how well it retains its colour. As a rule, a diamond\u2019s shade is baked into its atomic structure and even after it\u2019s been cut and polished, its colour stays the same for life. <\/p>\n\n\n\n

Certain types of lighting, different coloured metals surrounding a diamond, and even dirt and grime can make a diamond\u2019s colour appear to have changed. For instance, if a diamond is set in yellow gold, the warmth of the gold can accord a more golden tone to the diamond. If you wear a diamond ring every day, lotions and creams may make the gemstone appear slightly cloudy, and affect diamond clarity and colour, if only for a little while. But view your diamond in different light, have it re-set or take it for a professional clean, and you\u2019ll quickly breathe a sigh of relief. <\/p>\n\n\n\n

Both natural diamonds and LGDs<\/a> are highly stable when it comes to colour, but let\u2019s go deeper and really compare. <\/p>\n\n\n\n

Natural diamonds: formation and long-term colour stability<\/h2>\n\n\n\n

Do you know how natural diamonds are formed<\/a>? Around 4.5 billion years ago, stardust from the galaxy accumulated in the core of the Earth. It was this source of carbon that, when bonded under intense heat and pressure hundreds of kilometres deep, then crystallised and formed diamonds. <\/p>\n\n\n\n

How natural diamonds reach the surface<\/h3>\n\n\n\n

These incredible gemstones were then brought to the planet\u2019s surface by powerful volcanic eruptions millions of years ago and became lodged in pipe-like rocks.\u202fEven today, most are buried far too deep for us to recover. <\/p>\n\n\n\n

Why natural diamonds resist change over time<\/h3>\n\n\n\n

Because natural diamonds are formed\u00a0almost entirely\u00a0from carbon atoms bonded together in a rigid tetrahedral structure, they are not only the hardest naturally occurring substance on Earth1<\/a><\/sup>\u00a0but also one of the most stable2<\/a><\/sup>.\u00a0\u00a0<\/p>\n\n\n\n

How natural diamonds get their colour<\/h3>\n\n\n\n

The small amount of trace elements (such as nitrogen) or stress-induced irregularity in a diamond\u2019s structure that causes its colouration is locked into place under normal conditions, making it highly resistant to change. Generally, it would take extreme conditions (such as very high temperatures) to change the colours of a natural diamond. <\/p>\n\n\n\n

Chameleon diamonds and their rare, temporary colour shifts<\/h3>\n\n\n\n

But there are some exceptions, however. A \u2018chameleon diamond\u2019,\u00a0a very rare\u00a0type of natural diamond, is typically a grey-yellow-green colour. However, when\u00a0it\u2019s\u00a0heated to over 300\u00b0F (148.88\u00b0C) or exposed to light after a prolonged period in the dark, it changes to yellow. This colour change typically lasts around 15 minutes although some chameleon diamonds emit a yellow glow (or phosphoresce) for up to an hour3<\/a><\/sup>.\u00a0<\/sup>Cool, right?\u00a0\u00a0<\/p>\n\n\n\n

Pink and Argyle diamonds\u2019 response to light and heat<\/h3>\n\n\n\n

Then\u00a0there\u2019s\u00a0the mind-blowing science behind pink diamonds, particularly the coveted Argyle ones. These diamonds are photochromic, meaning their colour can fade under UV light and reappear under visible or blue light. They are also thermochromic. Expose them to temperatures above a scorching 1,472\u00b0F (800\u00b0C) and their colour will take on a more purplish tone4<\/a><\/sup>.\u00a0Also very cool.<\/p>\n\n\n\n

The science of colour grading diamonds<\/h3>\n\n\n\n

Colour is one of the\u00a04Cs of diamonds<\/a>.\u00a0The diamond colour scale is used to assess and certify\u00a0diamond clarity and\u00a0colour\u00a0(or, technically, the absence of colour).\u00a0For white diamonds, colour is graded on an alphabetic scale from D to Z, starting at completely colourless gems and ranging all the way to those with a noticeable warm, yellowish tint. A diamond with any shade or depth of colour beyond that is called a\u00a0fancy colour diamond<\/a>\u00a0\u2013 think vivid reds, pinks, blues,\u00a0greens\u00a0and browns, for example. Fancy coloured natural diamonds are graded using a separate system\u00a0that\u2019s\u00a0based on hue,\u00a0tone\u00a0and saturation.\u00a0<\/p>\n\n\n\n

Why a diamond\u2019s colour grade stays consistent<\/h3>\n\n\n\n

Because diamond\u00a0colour\u00a0doesn\u2019t\u00a0change over time, once your diamond has been given its\u00a0colour\u00a0grade, you can rest assured that\u00a0it\u2019ll\u00a0stay that grade for life.\u00a0<\/p>\n\n\n\n

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Lab-grown diamonds: production and colour stability<\/h2>\n\n\n\n

Their name would suggest that lab-grown diamonds (LGDs) are meticulously created in sterile laboratories but, in most cases,\u00a0they\u2019re\u00a0produced in huge industrial manufacturing plants.<\/p>\n\n\n\n

How lab-grown diamonds are created<\/h3>\n\n\n\n

While LGDs have the same chemical and optical properties as natural diamonds,\u00a0they\u2019re\u00a0created in an artificial environment in a\u00a0significantly\u00a0shorter\u00a0timeframe.<\/p>\n\n\n\n

The two common lab diamond production methods: HPHT and CVD<\/h3>\n\n\n\n

Generally, there are two different methods of producing LGDs. One is High-Pressure, High-Temperature (HPHT), which attempts to recreate the extreme geological conditions required for natural diamonds to grow deep in the Earth, in a factory using powerful high-pressure presses. <\/p>\n\n\n\n

The second technique is Chemical Vapour Deposition (CVD). This method involves heating carbon-bearing gases, such as methane, to extremely high temperatures in a vacuum chamber. The process breaks up the carbon-bearing molecules, allowing the carbon atoms to gradually build up layer by layer. <\/p>\n\n\n\n

How stable is colour in lab-grown diamonds?<\/h3>\n\n\n\n

Regardless of method, LGDs are\u00a0generally as\u00a0colour\u00a0stable as natural diamonds, since both types have stable atomic structures5<\/a><\/sup>.\u00a0However, a subset of CVD pink-grey diamonds with high silicon content can behave a little differently. Much like Argyle pinks, these gems are subject to photochromic responses, shifting to a cooler,\u00a0bluish\u00a0tone when exposed to UV light.\u00a0<\/p>\n\n\n\n

Colour treatments: what to check on reports<\/h3>\n\n\n\n

It\u2019s\u00a0also worth noting that many CVD diamonds undergo HPHT post-growth treatment to remove brown hues, or irradiation and heating to create vivid fancy\u00a0colours\u00a0like pink, blue, or green. These treatments are permanent and can also be carried out on natural diamonds, so\u00a0color\u00a0origin testing is wise6<\/a><\/sup>.\u00a0<\/p>\n\n\n\n

Insist on transparent disclosure of such\u00a0colour\u00a0treatments, so\u00a0you\u2019re\u00a0well aware\u00a0of the\u00a0colour\u00a0stability of the diamond of your choice. Ask if the\u00a0colour\u00a0is natural, treated,\u00a0or growth related, and whether the report\u00a0states\u00a0it.\u00a0<\/p>\n\n\n\n

Can diamonds change colour over time?<\/h2>\n\n\n\n

No, under everyday conditions, diamonds don\u2019t change colour. But, as we mentioned, sometimes they can appear to have changed colour due to external factors. These could include:  <\/p>\n\n\n\n