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Fancy Color Lab-Grown Diamonds Wholesale: What Buyers Should Know
A brand launches a pink halo ring. The first lot of 1.5 mm pink stones matches the approved sample. The reorder comes from a different batch: the same description on the parcel sheet, but next to the first lot it leans purple under store lighting. Neither lot was wrong. The order said “pink” and gave no reference stone and no tolerance, so there was nothing to hold the second lot to.
Lab-grown diamonds are made in yellow, blue, pink, green, black and other colors, at prices far below natural fancy colors. Some colors come from the growth process and some from treatment after growth, so the first question for any parcel is how its color was produced. For wholesale, define the hue and intensity with a reference stone, ask how the color was made and get it in writing, get reports for larger stones, and agree a color tolerance for multi-stone work.
How each color is usually produced
GIA describes nitrogen as the element that turns diamonds yellow, boron added during growth as the cause of blue, and pink and red as colors that can be produced by post-growth treatment involving radiation and heating. These are general patterns. The report and the supplier’s written statement tell you how a specific stone or parcel got its color.
Yellow lab-grown diamonds
Yellow is the most common fancy color in lab-grown supply, because nitrogen in the growth chamber gives the color directly. Many yellow stones are as-grown, from light canary to vivid. Ask whether a stone is as-grown or treated, and match parcels by face-up color, not by the grade alone. Browse yellow lab-grown diamonds.
Pink lab-grown diamonds
Most pink lab-grown diamonds get their color from post-growth treatment involving irradiation and heating. That is normal and acceptable when it is disclosed. Check that the report and the invoice both state the treatment, and compare tone and saturation side by side, because pinks vary a lot within one grade. Browse pink lab-grown diamonds.
Blue lab-grown diamonds
Blue comes from boron added during growth, usually in HPHT stones, so most blues are as-grown. Confirm this per stone. Blue stones can look grayish in some lighting, so view them in daylight and under store lighting before you approve a parcel. Browse blue lab-grown diamonds.
Disclosure of treated color
Treated color is normal in lab-grown fancy colors, but it has to be disclosed. Under the FTC Jewelry Guides, a treatment must be disclosed when it is not permanent, needs special care, or significantly affects value (16 CFR 23.24, which 23.14 applies to diamonds), and online listings must disclose it in the product description. Ask for the color origin on the invoice and check the report comments. Pass the same wording on to your own tags and listings.
How fancy colors are graded
Fancy colors are described by hue (for example pink), any modifier (for example purplish pink) and intensity, from Fancy Light through Fancy and Fancy Intense to Fancy Vivid, with Fancy Deep and Fancy Dark for darker tones. Laboratories grade color face-up. GIA’s Premium and Standard assessment, introduced in October 2025, covers colorless and near-colorless lab-grown diamonds; fancy colors are reported separately, so check what each laboratory’s current colored-stone report states, including color origin.
Matching colored stones
Color matching is harder than matching white stones, because small shifts in hue show at once. For pairs, eternity bands and pavé:
- Define hue and intensity with a master stone or a retained sample from the approved lot.
- Approve the sample under the lighting the piece will be sold in, and in daylight.
- Agree a tolerance for variation within a lot and between reorders.
- Ask for photos of the full parcel laid out together.
Care and stability
Tell setters and repairers which stones are treated, and avoid exposing them to high heat during repair without checking first. GIA has also recorded that the pink-brown color of some silicon-bearing CVD stones can be photochromic, shifting temporarily with exposure to light, which is one more reason to judge color under consistent conditions.
Documentation by stone size
Swipe the table to see more →
| Stone size | Typical documentation |
|---|---|
| Larger single stones | Individual report with color description and origin, treatment comments |
| Matched pairs | Reports, or measurements and color description |
| Melee | Parcel sheet: color range, sizes, as-grown or treated |
Where fancy colors are used
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| Use | Common colors |
|---|---|
| Fashion rings and bands | Pink, blue, yellow |
| Halos around white centers | Pink, blue |
| Men’s jewelry | Black, blue |
| Tennis bracelets | Yellow, pink, mixed color lines |
Fancy color questions
Are colored lab-grown diamonds treated?
Some are as-grown, often yellow and blue; others, especially pink, red and green, are usually treated. Ask for each stone or parcel.
Are fancy color lab-grown diamonds expensive?
Much less than natural fancy colors, though some colors cost more than comparable colorless lab-grown stones.
Can fancy colors be matched for pavé?
Yes, with a reference stone, an agreed tolerance and sample approval.
Is treated color permanent?
Generally stable in normal wear. Check before exposing stones to high heat during repair.
Send a reference stone or photo
Send the colors, shapes, sizes and quantities you need, with a reference stone or photos taken in daylight, and ask how the color of each lot is produced and how it is stated on the invoice. NUVU supplies fancy-color lab-grown diamonds, states on the report and invoice whether each color is as-grown or the result of post-growth treatment, and can arrange IGI, GIA or NGTC reports. Send your requirements or WhatsApp / WeChat +86 191 1840 3930.
Sources
7+ years researching color tuning, inclusions and defect characterization of lab-grown diamonds.
About NUVU. NUVU is the international brand of New Perspective Superhard Materials Co., Ltd. in Zhecheng, Henan, China. We grow HPHT lab-grown diamonds in-house and cut, polish and match stones in our own workshop.
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