Lab Grown Diamonds in Hong Kong: What They Are and How to Buy
Short answer: A lab grown diamond is a diamond created in a controlled laboratory by HPHT or CVD growth. It has essentially the same chemical composition, crystal structure and physical and optical properties as a natural diamond, but its origin is laboratory-grown rather than mined. It is not cubic zirconia, moissanite or Roselle's RZ® simulated-diamond material.
This Hong Kong guide explains the 4Cs, grading reports, price comparisons, HPHT versus CVD and the questions to ask before buying a loose stone or custom engagement ring.
Lab grown diamond, natural diamond and simulant: the difference
| Category | What it is | How to identify it | What to check |
|---|---|---|---|
| Lab grown diamond | Diamond grown by HPHT or CVD rather than formed in the earth. | Specialist instruments and an independent laboratory report identify its origin. | 4Cs, measurements, treatments, report number and laser inscription where applicable. |
| Natural diamond | Diamond formed naturally and recovered by mining. | Specialist testing distinguishes natural origin from laboratory growth. | 4Cs, measurements, treatments, provenance and grading report. |
| Simulant | A different material made to resemble diamond, such as cubic zirconia, moissanite or Roselle's RZ® category. | Its chemical and physical properties differ from diamond. | Exact material disclosure, durability, care and price. |
The distinction must be stated clearly: RZ® is a simulated-diamond category and is not a lab grown or mined diamond. Roselle maintains separate product categories so buyers can compare the correct material.
Are lab grown diamonds real diamonds?
Yes. The Gemological Institute of America states that laboratory-grown diamonds have essentially the same chemical composition and crystal structure as diamonds created by nature. They also have diamond's Mohs hardness of 10 and can look the same to the unaided eye. Origin cannot be established reliably from appearance alone; a gemmological laboratory uses specialist testing.
HPHT versus CVD
- HPHT (High Pressure High Temperature) uses high pressure and high temperature to grow diamond around a seed.
- CVD (Chemical Vapour Deposition) grows diamond from carbon-containing gas in a controlled chamber.
Both methods can produce gem-quality diamonds. Neither method alone determines whether a finished stone is better. Compare the individual diamond's cut, colour, clarity, measurements, transparency, treatment disclosure and grading report.
How to choose using the 4Cs
1. Cut
Cut quality has the greatest direct effect on brightness and sparkle. For a round brilliant, compare the laboratory cut grade as well as proportions, polish and symmetry. For fancy shapes, review measurements, outline and a clear video because a single cut grade may not tell the whole story.
2. Colour
Diamond colour is commonly graded from D to Z. The best choice depends on the shape, setting metal, size and your preference. A lower colour grade can still face up attractively in the right design.
3. Clarity
Clarity describes internal and external characteristics observed under standard grading conditions. Do not pay only for the label: ask whether any feature is visible without magnification and where it sits in the stone.
4. Carat weight
Carat is weight, not face-up size. Compare measurements as well as carat weight; two diamonds of the same weight can look different in diameter or outline.
How to verify a grading report
- Confirm that the report identifies the stone as laboratory grown.
- Match the report number, measurements and any girdle inscription to the item being offered.
- Check the report directly on the grading laboratory's website rather than relying only on a seller's image.
- Review comments for growth method, post-growth treatment or other disclosures where stated.
The International Gemological Institute explains that its loose-diamond reports identify natural or lab-grown origin and document the 4Cs. Report availability and grading laboratory can differ by item, so rely on the individual listing and report—not a blanket promise applied to every stone.
Lab grown diamond prices in Hong Kong
There is no honest single percentage or fixed price that applies to every lab grown diamond. Price changes with shape, carat, colour, clarity, cut, measurements, report, treatment, setting, metal and current inventory. Compare like with like on the same day and ask for an item-specific written quotation. Buy for beauty, wear and meaning rather than assuming future resale value.
Hong Kong buyer checklist
- Make sure the description says laboratory-grown diamond, not only “diamond-like”, “created stone” or a brand name.
- Verify the item-specific report and match its measurements.
- View a clear stone video and, where possible, compare the actual diamond in person.
- Confirm the setting metal, ring size, production time, delivery terms, returns and after-sales service in writing.
- For a custom ring, approve the design and total quotation before production.
Buy or compare lab grown diamonds with Roselle Jewelry
Roselle Jewelry is a Hong Kong jewellery retailer founded in 2009. Customers can compare loose lab grown diamonds online, discuss a custom ring and arrange a consultation at Causeway Bay or Tsim Sha Tsui. Item availability, grading report, treatment and delivery time can vary, so contact the team before visiting if you want to inspect a specific diamond.
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Frequently asked questions
What is a lab grown diamond?
It is diamond grown in a controlled laboratory by HPHT or CVD. Its origin differs from a mined diamond, while its essential diamond material and properties are substantially the same.
Is a lab grown diamond the same as cubic zirconia, moissanite or RZ®?
No. Those are simulants or different materials. A lab grown diamond is diamond; RZ® is Roselle's simulated-diamond category and is not a diamond.
Can I tell a lab grown diamond from a natural diamond by eye?
Usually not reliably. Specialist laboratory testing can identify growth features and determine origin.
Does every lab grown diamond have an IGI report?
No universal rule makes every item IGI-graded. Many loose stones carry an IGI or another independent laboratory report, but the laboratory and report availability must be checked for the specific item.
Which is better, HPHT or CVD?
Neither label guarantees a better finished diamond. Compare the individual stone's 4Cs, measurements, transparency, treatment disclosure and report.
Can a lab grown diamond be used in an engagement ring?
Yes. Diamond has Mohs hardness 10 and is suitable for daily-wear jewellery when correctly set and cared for.
Where can I compare lab grown diamonds in Hong Kong?
Roselle offers online comparison and consultations at Causeway Bay and Tsim Sha Tsui. Confirm availability before travelling to view a specific stone.
Independent references
- GIA: Laboratory-Grown Diamond Report and education
- GIA: HPHT and CVD growth processes
- IGI: report information and verification
This guide is educational. Product specifications, reports, prices, stock and service terms should be confirmed for the individual item before purchase.
