Colored lab-grown diamonds are diamonds grown in a laboratory that show a distinct body color, such as yellow, pink, blue, or black, instead of the near-colorless look most people picture. The color comes from the same causes that color natural diamonds: trace elements like nitrogen or boron, changes in the crystal structure, or dense dark inclusions. Some stones get their color during growth; others get it from a treatment applied after growth. A grading report from a laboratory such as IGI or GIA tells you which one you are buying.
This guide explains how lab-grown diamonds get their color, what sets yellow, pink, and black stones apart, how fancy color is graded and certified, and which oval ring settings and metals make each color look its best when you're looking for a jewelry gift for a woman or getting it for a wedding anniversary present for your husband.
Colored Lab-Grown Diamonds at a Glance
| Color | What usually causes it | Color during growth or after? | Look | Setting ideas |
|---|---|---|---|---|
| Yellow | Nitrogen atoms in the crystal | Can be grown (for example, HPHT growth with added nitrogen) | Sunny, from soft champagne-yellow to vivid canary | Yellow gold for warmth, white gold for contrast |
| Pink | Color centers (tiny lattice defects) | May be created or intensified by post-growth treatment | Blush to deep rose | Rose gold for harmony, white diamond halo to frame it |
| Black | Dense dark inclusions, or treatment | Varies by stone; check the report | Opaque, glossy, graphic | Bezel or halo of white diamonds for contrast and protection |
| Blue | Boron in the crystal | Can be grown | Cool, from icy pale blue to deep blue | White gold or platinum-toned metals |
How Lab-Grown Diamonds Get Their Color
A colorless diamond is almost pure carbon arranged in a tight, regular crystal. Color appears when something interrupts that perfect structure and changes how the stone absorbs light. Laboratory-grown diamonds are chemically and physically diamonds, so they follow the same rules as mined stones. The difference is that a grower can control many of the variables. (If you want the background on the two growth methods, see our guide to how lab-grown diamonds are made.)
According to the Gemological Institute of America (GIA), the main causes of diamond color are:
- Nitrogen produces yellow.
- Boron produces blue.
- Color centers, tiny defects in the crystal lattice, can produce pink and red.
- Radiation, which displaces carbon atoms, can produce green.
- Dark inclusions, such as graphite, produce black.
1. Color created during growth
Some colors are built into the diamond as it grows. GIA documented a group of 26 laboratory-grown Fancy Vivid yellow diamonds produced by the high-pressure, high-temperature (HPHT) method, where the yellow came from carefully controlled amounts of nitrogen added to the growth environment. No post-growth treatment was needed to reach that color (GIA Gems & Gemology, Spring 2025). Boron added during growth can likewise produce blue.
2. Color created or intensified after growth
Other colors are produced, or deepened, after the diamond is grown. GIA examined an HPHT-grown pink diamond whose color came from irradiation and annealing applied after growth, which created nitrogen-vacancy color centers inside the stone (GIA Gems & Gemology, Summer 2020). Neither route is inherently "better," but you should know which one your stone took.
Growth method matters too. Both HPHT and chemical vapor deposition (CVD) can produce colored diamonds, and the report will tell you which one was used. Our article on CVD vs HPHT lab-grown diamonds explains how each process works.
What the report actually says
To see how this shows up on paper, we reviewed publicly available IGI laboratory-grown diamond reports. One report for a Fancy Vivid Yellow stone lists the HPHT growth process and the comment "As Grown – No indication of post-growth treatment" (IGI report example). Another, for a Fancy Intense Pink stone grown by CVD, notes "Indications of post-growth treatment" (IGI report example). Same lab, two different histories, both disclosed in plain words.
Yellow, Pink and Black Lab-Grown Diamonds Explained
Lab-grown fancy colors span the spectrum, but yellow, pink, and black are the three this guide covers in depth.
1. Yellow and champagne tones
Yellow is the color most directly tied to nitrogen. In natural diamonds, GIA notes that browns and yellows are the most common fancy colors. In the lab, controlling nitrogen lets growers aim for a specific shade, from a pale straw or champagne-like tone to an intense canary yellow.
Yellow suits shoppers who want warmth and a sunny look in unique engagement ring designs. When comparing yellow stones, look at the intensity grade (more on that below) and how evenly the color is spread across the face of the diamond. Cut shape affects color too: brilliant-style cuts such as radiant and cushion are frequently used for colored diamonds because their faceting can intensify face-up color. In contrast, step cuts such as emerald tend to show a softer, more transparent tone.
2. Pink and rose hues
Pink has long been associated with romance, and it is rare in natural diamonds. GIA estimates that only about 1 in 10,000 carats of polished natural diamonds show fancy color of any kind, and yellows and browns make up the most common share of those, which makes natural pink considerably harder to find. Laboratory growth makes the look much more attainable.
Because pink color in lab-grown diamonds can be created or deepened after growth, pink is the color where reading the report matters most. GIA has also documented a treated lab-grown pink diamond that temporarily turned orange under strong short-wave ultraviolet light and returned to stable pink within minutes in normal daylight, which is best for a tennis bracelet jewelry look. Everyday lighting does not cause this, but it is a good reason to buy pink with full documentation and to ask about color stability.
3. Black diamonds for bold, modern settings
Black diamonds are opaque rather than transparent, so they do not sparkle the way a colorless diamond does. Instead, they offer a glossy, graphic surface that looks striking against white diamonds and bright metals. They suit alternative engagement rings, men's rings, and statement pieces.
According to GIA's black diamond buying guide, natural black diamonds owe their color to a high concentration of microscopic inclusions, mainly graphite. Treated black diamonds start as heavily included stones that are darkened with high-temperature annealing or irradiation. Lab-grown black diamonds are produced with HPHT or CVD growth and, per GIA, tend to show a flatter, more uniform, and glossier appearance than mined black stones.
Practical note: GIA advises gentle handling for black diamonds, including avoiding hard impacts and ultrasonic cleaners. That makes protective settings, such as a bezel or even three-stone rings, a sensible match for a black center stone.
Beyond the big three
Blue (from boron), green, orange, and purple lab-grown diamonds are also produced. The same advice applies to every color: confirm the growth method, check for treatment comments, and judge the color in person or in true-to-life photos and video.
How Color Affects Certification and Grading
Colored diamonds are not graded on the familiar D-to-Z scale used for near-colorless stones. That scale measures the absence of color. Fancy colors are graded on the presence of color: hue, tone (lightness or darkness), and saturation (intensity).
1. The fancy color grades
GIA's colored diamond system uses nine grades: Faint, Very Light, Light, Fancy Light, Fancy, Fancy Dark, Fancy Intense, Fancy Deep, and Fancy Vivid. A report combines the grade with the hue so that you may see wording such as "Fancy Intense Pink" or "Fancy Vivid Yellow." Black diamonds are graded as Fancy Black.
Stronger, purer color is generally more sought after, but the right grade depends on taste: a Fancy Light pink reads delicate, while a Fancy Vivid yellow makes a bold statement in stud earrings.
What to check on a colored lab-grown diamond report
- Origin: the report should clearly state that the stone is laboratory-grown. The US Federal Trade Commission's Jewelry Guides expect lab-grown diamonds to carry a clear qualifier such as "laboratory-grown" or "laboratory-created."
- Color grade and hue: for example, Fancy Intense Pink.
- Growth method: HPHT or CVD.
- Treatment comments: "As Grown" or "Indications of post-growth treatment."
- Color distribution: even or uneven, if listed.
- Laser inscription: if the report number is inscribed on the girdle, you can match the stone to its paperwork.
One more point on labs: since October 1, 2025, GIA assesses D-to-Z laboratory-grown diamonds with "Premium" or "Standard" descriptors rather than traditional 4Cs grades. IGI reports, like the examples above, still list full color grades and growth details. Whichever lab issued the report, the questions above still apply.
Styling Colored Diamonds: Settings That Make Them Pop
1. Match the metal to the color
- Yellow diamonds: A yellow gold setting reflects warm tones into the stone and can make yellow read richer, making it well suited to women's pendant jewelry. White gold gives crisp contrast and lets the yellow stand on its own. Two-tone designs combine both, for example, a yellow gold head under the stone with a white gold band.
- Pink diamonds: Rose gold creates a soft, tonal look that flatters pale pinks. White gold or a halo of colorless diamonds makes stronger pinks look more saturated by contrast.
- Black diamonds: White gold and bright yellow gold both contrast well. Rose gold gives a warmer, vintage-leaning feel for daily-wear lab-grown diamond earrings.
Not sure which metal fits your everyday style? Our comparison of platinum vs. white gold covers color, upkeep, and durability for white metals.
2. Frame the stone with colorless diamonds
A halo of near-colorless diamonds is a classic way to make a colored center stone look brighter and more saturated, because the eye reads the center against the white sparkle around it. Browse halo engagement rings to see how a frame changes the center's presence, or choose a micro pavé halo ring for a fine, delicate frame.
3. Protect edges with a bezel
A bezel surrounds the stone with a rim of metal. It suits black diamonds especially well, adding protection and a clean modern outline that complements their graphic look. Our bezel setting guide walks through the pros and cons. For the silhouette, see this oval bezel engagement ring or the more directional east-west half bezel ring.
4. Pair color with colorless
Two-stone toi et moi rings and three-stone rings are natural homes for color: a colored stone next to a colorless one, or colored side stones flanking a white center. The pear-cut toi et moi ring shows how two stones can share one setting, and the three-stone collection shows the classic trio layout.
5. Exploring color with Lockstone Jewels
The Lockstone Jewels collection centers on IGI-certified, near-colorless (EF) lab-grown diamonds, with most designs offered in 14K or 18K yellow, white, and rose gold. If you love the warmth of a colored stone, yellow or rose gold is an easy way to bring that tone into a ring today. Our designs also list customization as available, so if you have a specific colored stone in mind for a particular setting, contact our team to talk through what is possible for that design.
Caring for Colored Lab-Grown Diamonds
Day to day, colored lab-grown diamonds need the same care as any diamond: warm water, a drop of mild dish soap, and a soft brush, then a rinse and dry. A few color-specific points help:
- Skip ultrasonic and steam cleaners for black diamonds and for any stone with treatment comments on its report, unless your jeweler confirms they are safe.
- Avoid prolonged high heat, such as a jeweler's torch during repairs, without telling the jeweler the stone is color-treated.
- Have prongs and bezels checked periodically, especially on rings worn every day.
For full cleaning, storage, and insurance guidance, see our lab-grown diamond jewelry care guide.
Frequently Asked Questions
1. Are colored lab-grown diamonds real diamonds?
Yes. A colored lab-grown diamond is a real diamond, made of carbon in the same crystal structure as a mined diamond. It differs in origin, not in material. It is also distinct from simulants such as cubic zirconia or moissanite. Learn more in Are Lab-Grown Diamonds Real Diamonds?
2. Are colored lab-grown diamonds treated?
Some are, and some are not. Yellow and blue stones can get their color during growth, while pink stones may be treated after growth with processes such as irradiation and annealing. The grading report states either "As Grown" or indicates post-growth treatment.
3. Will the color of a lab-grown diamond fade?
Color from trace elements such as nitrogen or boron is part of the crystal itself. With treated stones, behavior can vary: GIA has recorded a treated pink lab-grown diamond that temporarily changed color under strong short-wave UV light and returned to pink within minutes in daylight. Ask your seller about color stability and keep your report.
4. How are colored lab-grown diamonds graded?
Instead of the D-to-Z scale, fancy colors are graded by hue, tone, and saturation, with grades from Faint through Fancy Vivid. A report might read "Fancy Intense Pink," along with the growth method and any treatment comments.
5. Are black lab-grown diamonds durable enough for an engagement ring?
They can be, with sensible choices. Black diamonds should be handled gently and kept away from ultrasonic cleaners, so a protective bezel or halo setting and periodic setting checks are good practice for a ring worn every day.
The Bottom Line
Colored lab-grown diamonds open up shades that are rare in nature. The material is diamond, but how the color was achieved varies from stone to stone. Read the report for the color grade, growth method, and treatment comments, choose a metal and setting that support the hue, and you can wear color with the same confidence as a classic white diamond.
Ready to explore settings? Discover unique, vintage-style lab-grown diamond rings in silhouettes that pair beautifully with warm metals and statement stones.