Are Lab-Grown Diamonds Real Diamonds? An In-Depth Guide to Materials, Certification and Identification
Updated: Oct 17
Yes. A lab-grown diamond is a real diamond. It is composed of carbon atoms arranged in a diamond crystal structure, with essentially the same chemical composition, crystal structure, and physical and optical properties as a natural diamond. The key difference lies in its origin: a lab-grown diamond is created in a controlled laboratory environment. When purchasing, it should be clearly identified and represented as a lab-grown diamond.
For customers, it is important to distinguish three key aspects: whether the material is diamond, whether its origin is natural or lab-grown, and the quality of the individual diamond. Understanding these distinctions allows you to interpret diamond reports accurately, compare prices more meaningfully, and select jewellery that aligns with your expectations.
Table of Contents
Why Are Lab-Grown Diamonds Considered Real Diamonds?
The key to determining whether a material is a diamond lies in its chemical composition and crystal structure. Both lab-grown diamonds and natural diamonds consist of carbon atoms arranged in the characteristic crystal structure of diamond, giving them the fundamental material properties of diamond.
According to GIA’s explanation of natural and laboratory-grown diamonds, natural and laboratory-grown diamonds have essentially the same chemical, physical, and optical properties. However, their growth histories and certain microscopic characteristics differ, allowing professional gemological laboratories to distinguish between their origins.
Therefore, the statements “a lab-grown diamond is a real diamond” and “a lab-grown diamond has a laboratory-grown origin” can both be true. Jewellery retailers should nevertheless clearly disclose the diamond’s origin, so customers understand exactly what type of diamond they are purchasing.
The U.S. Federal Trade Commission (FTC) Jewellery Guides also distinguish laboratory-grown diamonds from diamond simulants and require their laboratory-grown or non-mined origin to be clearly disclosed when they are marketed and sold.
What Is the Difference Between Lab-Grown Diamonds, Natural Diamonds, Moissanite and Cubic Zirconia?
All four materials can be fashioned into beautiful, sparkling jewellery, but their material composition and origin are fundamentally different and should be understood separately.
The GIA refers to materials such as moissanite and cubic zirconia that are used to imitate the appearance of diamonds as diamond simulants. While these materials can have their own value and appeal as jewellery, their visual similarity to diamonds does not make them lab-grown diamonds, and they should not be marketed or sold as such. GIA: Man-Made Diamonds — Questions and Answers
When purchasing jewellery, customers should ensure that the product description, sales documentation and grading report clearly identify the material. Avoid relying on vague terms such as “man-made stone” or “simulated diamond,” as these terms may not clearly indicate whether the stone is a lab-grown diamond or a diamond simulant.
How Are Diamonds Grown Using HPHT and CVD?
The two main methods used to grow lab-grown diamonds today are HPHT (High Pressure High Temperature) and CVD (Chemical Vapor Deposition). Both methods can produce genuine diamond crystals.
HPHT: High Pressure High Temperature
Under carefully controlled high-temperature and high-pressure conditions, carbon crystallizes around a diamond seed, gradually forming a diamond crystal. The process recreates some of the conditions associated with the formation of natural diamonds, although the manufacturing environment and growth process are different.
CVD: Chemical Vapor Deposition
CVD uses a carbon-containing gas within a controlled reaction chamber. Carbon atoms are deposited onto a diamond seed and gradually build up, layer by layer, to form a diamond crystal.
The growth method describes how the diamond was formed, but the terms HPHT and CVD alone do not determine which diamond is of higher quality. Each individual diamond should still be evaluated based on factors such as colour, clarity, proportions, transparency, and the information documented in its grading report.
Can Natural and Lab-Grown Diamonds Be Distinguished by the Naked Eye or a Diamond Tester?
Naked-eye observation: useful for assessing appearance, but not for reliably determining origin
Differences in brilliance, colour, inclusions and cut can provide useful references when assessing a diamond’s appearance and quality. However, characteristics such as being “very brilliant,” “very white” or “very clean” cannot, on their own, reliably determine whether a diamond is natural or lab-grown.
Standard diamond testers: understand what they actually measure
Some diamond testers primarily rely on properties such as thermal conductivity to screen and identify certain materials. Because natural and lab-grown diamonds have closely related physical properties, a standard diamond tester cannot reliably determine whether a diamond is natural or lab-grown.
In addition, some instruments that measure thermal conductivity alone may identify moissanite as diamond. The FTC’s jewellery guidance also highlights this limitation.
Therefore, a positive response from a diamond tester is not, by itself, sufficient to establish the material and origin of a stone.
Professional testing: appropriate equipment and identification procedures
Professional gemological laboratories use techniques such as spectroscopy, analysis of growth characteristics and other diagnostic methods to determine whether a diamond is natural or lab-grown. When purchasing, a more comprehensive verification process can combine a professional grading report, official report verification and physical examination of the diamond.
What Can GIA and IGI Grading Reports Confirm?
A grading report records the identity, origin and relevant quality characteristics of the diamond submitted for examination. When reviewing a report, it is important to consider its specific contents and report format rather than relying solely on the name of the issuing laboratory.
GIA: Pay attention to current services and report formats
For qualifying colourless to near-colourless loose lab-grown diamonds, GIA currently provides quality assessments using Premium / Standard classifications. GIA also offers other reporting services for laboratory-grown coloured diamonds. Earlier report formats may still be found in the market, so not all GIA lab-grown diamond reports should be described as having the same format or as presenting grading information in exactly the same way as reports for natural diamonds.
For details, see GIA’s current laboratory-grown diamond services.
IGI: Quality information based on the 4Cs
IGI provides identification and grading services for lab-grown diamonds and continues to apply the 4Cs grading system. When purchasing, customers should check the specific report for details such as carat weight, colour, clarity, shape and other quality characteristics. The fields presented may vary depending on the diamond’s shape and the type of report issued.
For details, see IGI’s Laboratory-Grown Diamond Report and IGI’s statement on its continued commitment to 4Cs grading
When receiving the diamond, verify the report against the physical stone
Check the stated origin: Confirm that the report clearly identifies the stone as a Laboratory-Grown Diamond or uses equivalent wording indicating its laboratory-grown origin.
Verify the report online: Use the grading laboratory’s official verification service to check the report number and corresponding information.
Match the physical diamond: Compare the shape, measurements and other identifiable characteristics. Where a girdle inscription is present, verify that the inscription matches the report.
Review the specific quality information: Understand the report format, assessment method and information provided, then evaluate the diamond itself.
An official online report verification is an important part of the checking process, but it should be accompanied by confirmation that the physical diamond in hand corresponds to that report. A grading report is also not a guarantee of future value or a commitment to repurchase.
Are All Real Diamonds the Same in Quality and Brilliance?
Even when two diamonds are both lab-grown diamonds, their individual quality can still vary. Once the material and origin have been verified, it is important to assess factors such as colour, clarity, cut proportions, transparency and light performance.
For example, two diamonds may both be graded D colour and VVS clarity, yet still display differences in brightness, fire and apparent size due to variations in their proportions and cutting precision. For colourless diamonds, it is also important to look for undesirable colour tints, haziness or a milky appearance, rather than making a decision based solely on carat weight and price.
When comparing diamonds, it is helpful to view them under similar lighting conditions, from a similar distance and against a comparable background, and then observe how they perform under different lighting environments. For jewellery featuring multiple diamonds, attention should also be given to whether the stones have consistent colour, visual proportions and brilliance, creating a harmonious overall appearance.
How Does RAGAZZA Select High-Quality Lab-Grown Diamonds?
RAGAZZA Premium Grade lab-grown diamonds are exclusively accompanied by GIA grading reports. For colourless diamonds, our quality requirements include D colour, VVS2 clarity or higher, and Excellent polish and symmetry (EX/EX). These standards also apply to qualifying fancy-shaped diamonds.
For round brilliant diamonds, RAGAZZA additionally requires a DAII™ score of 7.00 or above. DAII™ is a proprietary diamond quality assessment model developed by RAGAZZA, incorporating 16 parameters to assist in evaluating and comparing differences in proportions and overall diamond quality.
Beyond grading data and certification, we also examine the physical diamond for its brightness, fire, colour appearance and transparency. Fancy-shaped diamonds, including pear, oval and emerald cuts, are selected according to their respective cutting characteristics and overall visual appearance.
RAGAZZA Premium Grade is RAGAZZA’s own diamond selection classification and should be understood separately from the Premium classification used in certain GIA laboratory-grown diamond reports.
Explore RAGAZZA High-Quality Lab-Grown Diamonds & Jewellery to learn more about our selection standards and jewellery. For a step-by-step approach to comparing and selecting lab-grown diamonds, see Lab-Grown Diamond Buying Guide
If you would like to compare natural and lab-grown diamonds in person and understand how the grading report corresponds to the physical diamond, visit RAGAZZA Showroom to arrange an in-store consultation.
Frequently Asked Questions About Lab-Grown Diamonds
Is a “synthetic diamond” a fake diamond?
No. In gemological terminology, “synthetic diamond” can refer to a laboratory-grown diamond. The material is still diamond. However, terms such as “man-made” or “simulated diamond” can be ambiguous, so the material and origin should always be clearly stated.
Will a lab-grown diamond deteriorate over time?
No. Under normal wear, a lab-grown diamond remains diamond. Regular cleaning and proper care are still recommended.GIA Diamond Care Guide
Why are lab-grown diamonds generally less expensive?
Pricing reflects factors such as origin, supply, individual quality and market demand. Comparisons should be based on diamonds with similar specifications and current market prices. Lab-Grown Diamond Price Guide
Are lab-grown diamonds more environmentally friendly?
Environmental impact depends on factors such as production methods and energy sources. Consider verified information alongside your budget, intended use and preference for natural or laboratory-grown origin.
Original content by RAGAZZA Diamond. All rights reserved. No unauthorized reproduction or use.
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To compare carat sizes and reporting options within your budget, read our lab grown diamond price guide for HKD and TWD price tables and complete diamond-and-setting budgets.
