Diamond Education
Fancy Coloured Diamond
Everything you need to know about natural, lab-grown and treated coloured diamonds
Fancy coloured diamonds combine the durability of diamond with colours ranging from champagne and yellow to vivid pink, blue, green and exceptionally rare red.
At Fergus James, we can source natural, lab-grown and colour-treated diamonds according to the colour, intensity, shape, size and budget you're looking for.
Key Takeaways
Colour Comes First
Unlike white diamonds, colour is usually the most important quality factor. Hue, intensity and how evenly the colour appears can have a major impact on beauty and value.
Origin Changes Everything
Natural, lab-grown and treated coloured diamonds can look beautiful, but their rarity and value can be dramatically different. Certification and disclosure matter.
Compare the Actual Diamond
Two coloured diamonds with similar grades can look noticeably different. The certificate describes the colour; your eyes decide whether you love it.
Types
What Is a Fancy
Coloured Diamond?
A fancy coloured diamond displays colour beyond the conventional D–Z grading range used for most white diamonds.
With white diamonds, increasingly noticeable yellow or brown colour generally lowers the colour grade. With fancy coloured diamonds, the opposite can be true: stronger and purer natural colour can make a diamond considerably rarer and more valuable.
Fancy coloured diamonds fall into three main categories:
Naturally Coloured
The colour developed naturally as the diamond formed.
Lab-Grown Coloured
The diamond was created in a laboratory and displays a fancy colour.
Colour-Treated Natural
The diamond is natural, but its original colour has subsequently been altered or enhanced.
These categories can look similar but have very different rarity and price.
Natural vs Lab-Grown vs Colour-Treated
Naturally Coloured Diamonds
Natural fancy coloured diamonds formed within the Earth, with their colour developing through trace elements or changes within the diamond's crystal structure.
Their rarity depends heavily on the particular colour, intensity, modifiers and size.
Lab-Grown Coloured Diamonds
Lab-grown coloured diamonds have essentially the same chemical composition and crystal structure as natural diamonds but are created in a controlled environment.
They can provide strong colour and larger sizes at a significantly more accessible price, particularly for pink, yellow and blue diamonds.
Colour-Treated Diamonds
A colour-treated diamond starts as a natural diamond but undergoes a process that alters or enhances its colour.
Treatments can include irradiation, heating and HPHT processing.
Treatment doesn't automatically make a diamond undesirable. What matters is that you understand exactly what you're buying and any known treatment is properly disclosed.
At Fergus James, all known treatments are disclosed before purchase.
Colour
How Are Fancy Coloured
Diamonds Graded?
The traditional 4Cs still matter, but the priorities change. With rare natural fancy colours in particular, colour usually comes first.
Hue
The dominant colour - such as yellow, pink, blue or green.
Tone
How light or dark the colour appears.
Saturation
The strength or concentration of the colour.
Colour Distribution
How evenly the colour appears across the diamond.
Modifiers
Secondary colours that influence the dominant hue. A purplish pink, for example, is predominantly pink with purple modifying its appearance.
From Our Experience...
Modifiers aren't automatically undesirable.
A rarer colour description doesn't necessarily mean you'll prefer the diamond. We'd rather find the shade you actually love than recommend a stone purely because its terminology commands a premium.
Understanding Colour Intensity
GIA terminology includes:
Faint → Very Light → Light → Fancy Light → Fancy → Fancy Intense → Fancy Vivid → Fancy Deep → Fancy Dark
These shouldn't be treated as a simple scale from “worst” to “best”.
Fancy Light provides a softer appearance, while Fancy Intense and Fancy Vivid create increasingly strong colour. Fancy Deep and Fancy Dark describe different combinations of tone and saturation rather than simply being stronger versions of Fancy Vivid.
The right intensity is personal. Some customers want subtle colour, while others want colour to be the first thing you notice.
Does Clarity Still Matter?
Yes - but exceptional colour can sometimes make a lower clarity grade more acceptable than it would be in a white diamond.
At Fergus James, we generally favour high-quality fancy coloured diamonds and commonly recommend VS2 clarity or better where suitable options are available.
However, an eye-clean, structurally sound diamond with exceptional colour may be preferable to a higher-clarity diamond with weaker colour.
Fergus James Expert Insight
With fancy colours, we wouldn't sacrifice a beautiful, rare colour simply to achieve a clarity grade that creates no meaningful visible improvement.
Rarity
A Guide to Fancy
Diamond Colours
Natural fancy coloured diamonds occur in a remarkable range of colours, with rarity and appearance varying significantly between individual stones. Hue, intensity, modifying colours and size can all influence rarity and value.
Yellow
Yellow is the most widely recognised and generally one of the more accessible natural fancy diamond colours.
Natural rarity: Rare, but comparatively available
Availability: Good
Look for: Bright, attractive saturation
Fergus James Expert Insight
Radiant and Cushion cuts can be particularly effective at concentrating yellow colour.
Pink
Natural pink diamonds are exceptionally rare, ranging from delicate pastel pink to strongly saturated colours.
Natural rarity: Exceptional
Availability: Very limited
Look for: A shade you genuinely love
Fergus James Expert Insight
Lab-grown pink offers a much more accessible alternative when colour rather than natural rarity is the priority.
Blue
Natural blue diamonds are exceptionally rare and can range from pale blue through to strongly saturated shades.
Natural rarity: Exceptional
Availability: Very limited
Look for: Colour origin and modifiers
Fergus James Expert Insight
Certification is particularly important because natural, treated and lab-grown blue diamonds represent dramatically different rarity and value.
Champagne / Brown
These warm shades range from pale golden and honey tones through to deeper cognac-like colours.
Natural rarity: More abundant
Availability: Good
Look for: A tone that complements the finished jewellery
Fergus James Expert Insight
They can offer excellent value for someone wanting a distinctive natural diamond without the premium attached to rarer colours.
Black
Unlike most fancy colours, black diamonds generally have an opaque appearance. Both natural and treated black diamonds are available.
Natural rarity: Natural black is uncommon
Availability: Varies
Look for: Colour origin, treatment and surface condition
Fergus James Expert Insight
A consistent black appearance alone doesn't tell you everything about the diamond. Origin, treatment and condition still matter.
Green
Natural green diamonds are particularly unusual, with strongly saturated natural examples being exceptionally rare.
Natural rarity: Exceptional
Availability: Very limited
Look for: Authoritative confirmation of colour origin
Fergus James Expert Insight
For a significant natural green diamond, we'd place particular emphasis on the grading report and confirmation of colour origin.
Orange
Natural orange diamonds can be extremely rare, particularly in pure, strongly saturated colours.
Natural rarity: Very rare
Availability: Limited
Look for: Tone and modifying colours
Fergus James Expert Insight
Don't choose by colour name alone. Modifiers can completely change how the diamond actually looks.
Purple
Natural purple diamonds can be extremely rare, particularly in pure, strongly saturated colours.
Natural rarity: Very rare
Availability: Limited
Look for: Tone and modifying colours
Fergus James Expert Insight
Don't choose by colour name alone. Modifiers can completely change how the diamond actually looks.
Red
Natural red diamonds are among the rarest diamonds in existence.
Natural rarity: Exceptional
Availability: Extremely limited
Look for: Certification, modifiers and international availability
Fergus James Expert Insight
Significant natural reds usually require a specialist sourcing search rather than conventional inventory.
Understanding Natural Colour Rarity
Natural coloured-diamond rarity varies enormously according to hue, intensity, modifiers and size, so the comparisons above are broad guidance rather than strict rankings.
A large, strongly saturated diamond of one colour can be considerably rarer than a smaller or weaker example of another.
Colour alone doesn't determine rarity.
Price
Does Shape Affect
Fancy Colour?
Yes. With fancy coloured diamonds, cutting isn't only about creating brilliance - it can also help concentrate and display colour.
This is one reason Radiant and Cushion shapes are particularly popular for fancy colours.
With exceptionally rare natural rough, cutters may also prioritise preserving valuable colour and carat weight, so we wouldn't assess a fancy coloured diamond using exactly the same priorities as a colourless diamond.
How Much Does a Fancy Coloured Diamond Cost?
There's no simple price-per-carat rule.
For natural fancy coloured diamonds, colour is usually the biggest driver of value. Hue, intensity, distribution and modifiers all matter alongside rarity, carat weight, clarity, shape and certification.
Approximate Fergus James Starting Prices
Diamond Ring
Lab-Grown Price
Natural Price
1ct Yellow
$2,000
$5,000
1ct Pink
$2,000
Price on Request
Indicative starting prices rather than fixed quotations.
Particularly rare natural pink, blue, green, orange or red diamonds need to be priced individually according to the diamond and current availability.
Certification
Certification &
Colour Origin
Certification is especially important with fancy coloured diamonds because it can help establish what the diamond is and where its colour comes from.
At Fergus James:
- Natural fancy coloured diamonds 0.30ct+ → normally GIA certified
- Lab-grown fancy coloured diamonds 0.30ct+ → normally IGI certified
- Known or detected colour treatments → disclosed
For a natural coloured diamond, the grading report can identify its colour grade and whether the colour is considered natural or treated.
Fergus James Expert Insight
Certification describes the diamond; it doesn't tell you which diamond is the most beautiful.
We review the report alongside imagery and, where possible, direct inspection before recommending an individual stone.
Sourcing
Choosing the
Setting & Metal
The surrounding metal can influence how colour appears.
Yellow Diamond → Yellow gold can reinforce its warmth
Pink Diamond → Rose gold can complement pink tones
Blue or Black → White metals can create crisp contrast
Champagne → Yellow or rose gold can complement warmer tones
Mixed metals can also be used. For example, yellow-gold prongs around a yellow centre diamond can subtly reinforce its colour even when the rest of the ring is platinum or white gold.
White-diamond halos and side stones can create contrast and make a coloured centre stone appear even more pronounced.
Sourcing
How Fergus James Sources
Fancy Coloured Diamonds
Fancy coloured diamonds are often better sourced around you than selected from a fixed inventory.
We'll establish your preferred:
Origin · Colour · Modifiers · Intensity · Shape · Size · Clarity · Certification · Design · Budget
We can then search our international diamond supply network for suitable options rather than limiting you to what's currently displayed online.
You'll normally receive HD imagery or video and the relevant grading reports. Where possible, selected diamonds may also be brought into our Dubai showroom so you can compare them in person.
From Our Experience...
This is particularly valuable with fancy colours because a certificate can't fully communicate how the colour actually looks.
Once you've selected your diamond, our Dubai workshop can create a bespoke piece around it, with the design approved through CAD before production.
Frequently Asked Questions
Yes. Lab-grown coloured diamonds have essentially the same chemical composition and crystal structure as natural diamonds. They are created in a controlled environment and can provide strong colour at a more accessible price.
Natural red diamonds are among the rarest diamonds in existence. Strongly saturated natural green, pink and blue diamonds are also exceptionally rare, and significant examples usually need to be sourced individually.
A canary diamond is a strongly saturated yellow fancy coloured diamond. Yellow is the most widely recognised fancy colour and generally one of the more accessible natural fancy colours.
Natural pink diamonds are exceptionally rare, and availability is very limited. Hue, intensity, modifiers and size all influence value, so particularly rare stones are priced individually.
Both natural and treated black diamonds are available. Natural black is uncommon. Origin, treatment and surface condition still matter, and a consistent black appearance alone doesn't tell you everything about the diamond.
Yes. Tell us the origin, colour, modifiers, intensity, shape, size, clarity, certification, design and budget you're looking for. We search our international diamond supply network rather than limiting you to what's currently displayed online.