When most people picture a diamond, they picture colourless. White. The classic solitaire.
That picture is changing fast. In India in 2026, yellow lab-grown diamonds are trending sharply among buyers who want something that stands out. Pink lab diamonds are gaining ground as an accessible alternative to the extraordinarily rare and expensive natural pink. Blue lab diamonds are making appearances in statement rings and pendants that would have cost hundreds of times more in mined form.
This guide explains what coloured lab-grown diamonds actually are, how they get their colour, how they are graded, and what to look for before you buy one in India.
How Do Lab-Grown Diamonds Get Their Colour?
In nature, diamond colour comes from trace elements or structural anomalies that occur during growth deep underground. The same mechanisms are replicated in lab-grown diamond production.
Yellow diamonds get their colour from nitrogen atoms that replace carbon in the crystal lattice. In CVD production, nitrogen is introduced into the growth chamber in controlled quantities. The more nitrogen present, the deeper the yellow. This is the same mechanism behind natural fancy colour diamonds like the famous Tiffany Yellow Diamond, which owes its colour to nitrogen.
Pink diamonds are more complex. Their colour in natural mined form comes from structural distortion of the crystal lattice, not a trace element. In lab-grown pink diamonds, this is typically achieved through HPHT treatment applied after CVD growth, which induces the same structural changes. The result is a genuine pink diamond colour.
Blue diamonds get their colour from boron atoms that replace carbon in the lattice. In CVD growth, boron is introduced into the gas mixture. Natural blue diamonds, including the famous Hope Diamond, are blue for the same reason. Boron-doped CVD blue lab diamonds are chemically identical to natural boron-type blue diamonds.
How Are Coloured Lab Diamonds Graded?
Coloured diamonds, whether mined or lab-grown, are graded on a completely different scale from colourless diamonds. Instead of the D to Z scale used for white diamonds, fancy colour diamonds are graded on their hue, saturation, and tone.
The grades from lowest to highest intensity are: Faint, Very Light, Light, Fancy Light, Fancy, Fancy Intense, Fancy Vivid, Fancy Deep, and Fancy Dark.
Fancy Vivid is the most prized and expensive grade for any colour. A Fancy Vivid Yellow lab-grown diamond is a genuinely exceptional stone in terms of colour intensity.
IGI issues fancy colour grading reports for lab-grown coloured diamonds that specify the colour grade, hue, saturation, and whether the colour is natural to the growth process or a result of post-growth treatment. Always ask for this report specifically when buying a coloured diamond.
Yellow Lab-Grown Diamonds: The Trending Choice
Yellow is the most commercially available and affordable of the fancy colour lab-grown diamonds. It is also the fastest-growing trend in the Indian market in 2026.
A Fancy Yellow or Fancy Intense Yellow lab-grown diamond in a one-carat round brilliant can cost between Rs 35,000 and Rs 80,000 depending on intensity and quality. A natural Fancy Intense Yellow mined diamond of the same size could cost Rs 5,00,000 or more. The savings are enormous.
Yellow lab diamonds work beautifully in yellow gold settings, where the warm tones complement each other. They also create striking contrast in white gold or platinum. Popular choices include yellow diamond solitaire rings, yellow diamond studs, and yellow diamond pendants.
Pink Lab-Grown Diamonds: Accessible Luxury
Natural pink mined diamonds are among the rarest and most expensive diamonds in the world. The closure of the Argyle mine in Australia in 2020, which produced most of the world's supply of natural pink diamonds, has made natural pinks even more scarce and costly.
Lab-grown pink diamonds fill this gap in a meaningful way. A one-carat lab-grown pink diamond at a Fancy or Fancy Intense grade can cost Rs 50,000 to Rs 1,50,000. The natural equivalent could cost Rs 50,00,000 or more.
Pink lab diamonds are popular for engagement rings, anniversary gifts, and statement earrings. Their romantic colour makes them particularly appealing for gifting occasions. When buying, ensure the IGI certificate specifies the colour origin and any post-growth treatment.
Blue Lab-Grown Diamonds: The Statement Stone
Blue lab diamonds are the most technically complex of the three main fancy colours and carry a higher price premium than yellow. However, they are still dramatically more accessible than natural blue diamonds, which are extraordinarily rare.
A one-carat Fancy Blue lab-grown diamond can cost Rs 80,000 to Rs 2,00,000 depending on intensity. A natural blue mined diamond of comparable quality would cost several crores.
Blue lab diamonds work beautifully in white metal settings where the colour is shown to maximum effect. They are increasingly popular in cocktail rings, statement pendants, and as centre stones in bespoke engagement rings.
What to Check Before Buying a Coloured Lab Diamond in India
Colour origin disclosure is essential. Under India's BIS IS 19469:2025 standard, the lab-grown origin must be disclosed. Additionally, any post-growth treatment used to produce the colour must be noted on the IGI certificate. Ask for this documentation explicitly.
Verify the colour grade on the IGI certificate. The certificate should state the specific fancy colour grade (Fancy Yellow, Fancy Vivid Pink, etc.), not just a generic colour description.
Consider the setting. Yellow diamonds in yellow gold create warmth and harmony. Pink diamonds in rose gold are romantic and unified. Blue diamonds in white gold or platinum allow the colour to be the centrepiece. The metal choice dramatically affects how the colour reads.
Compare with the colourless equivalent. For the same budget, you can often get a larger or better-graded coloured lab diamond than a colourless one, because the colour preference narrows the buyer pool.
Frequently Asked Questions
Are yellow lab-grown diamonds the same as citrine or yellow sapphire?
No. Yellow lab-grown diamonds are pure carbon in a diamond crystal structure, identical to yellow mined diamonds. Citrine is quartz and yellow sapphire is corundum. These are entirely different gemstones with different hardness, optical properties, and chemical composition.
Does post-growth treatment affect the quality of a pink lab diamond?
HPHT post-growth treatment is an accepted industry process for producing pink colour in lab diamonds. It is not a defect. It must be disclosed on the IGI certificate, and any reputable seller will disclose it proactively.
Are coloured lab diamonds more expensive than colourless ones?
It depends on the colour and intensity. Fancy Light Yellow lab diamonds can be priced similarly to or even below comparable colourless stones. Fancy Vivid Pink or Blue stones carry significant premiums due to the complexity of achieving those colours and the lower production volume.
Can I get coloured lab diamonds in other colours?
Yes. Beyond yellow, pink, and blue, lab-grown diamonds are available in green, orange, and even red, though these are rarer and more expensive even in lab form. Yellow, pink, and blue are the most commercially available for Indian buyers.
The Bottom Line
Coloured lab-grown diamonds are one of the most exciting developments in the Indian jewellery market in 2026. They make colours that were previously available only to the ultra-wealthy genuinely accessible to a broad range of buyers.
Yellow lab diamonds for the trend-conscious buyer. Pink for romance and gifting. Blue for the statement piece. All three are real, certified, and beautiful.
Read our guide on How Are Lab-Grown Diamonds Made: CVD vs HPHT to understand the science behind how colours are created. Then explore Goenka Jewellers' lab-grown diamond collection to see certified coloured stones across rings, earrings, and pendants.