Lab-Grown vs. Natural Diamonds: Value, Resale & Insurance
How-To Guides
Lab-grown and natural diamonds have different origins, even though they can look alike and share many physical and optical properties. Their reports, prices, resale markets, and insurance documentation should be considered separately rather than treated as interchangeable.
What “lab-grown” means
Laboratory-grown diamonds are produced using methods such as high-pressure, high-temperature (HPHT) or chemical vapor deposition (CVD). They are not the same as simulants such as cubic zirconia or moissanite. GIA explains that lab-grown and natural diamonds have nearly the same chemical, optical, and physical properties, while their growth histories differ and can be identified by trained laboratories using specialized equipment. See GIA’s explanation of lab-grown diamonds.
Read the report for origin and details
Check which laboratory issued the report, the report date and number, and whether it identifies the stone as laboratory-grown or natural. Report formats and grading terminology can differ by lab and can change over time, so use the issuing laboratory’s instructions rather than assuming two reports use identical scales. IGI’s lab-grown diamond report guide describes information found on its reports. A grading report describes a stone; it is not an appraisal or a guaranteed sale price.
For a refresher on report fields, see how to read a diamond certificate. Verify the report number with the issuing lab where that service is available, and ask a qualified gemologist if the stone and report do not appear to match.
How value and resale can differ
There is no reliable fixed resale percentage that applies to every lab-grown or natural diamond. A real-world offer depends on the specific stone and jewelry, condition, report, setting and brand, the buyer, and the market at the time of sale. Lab-grown prices and resale demand may move differently from natural diamonds, so compare like with like: same origin, similar specifications, similar jewelry, and recent completed sales where possible. An asking price is not proof that an item sold for that amount.
Do not treat a grading report as a valuation, and do not assume the original retail price is today’s resale value. If you need an opinion for a sale, estate, or other formal purpose, ask an appraiser to state the intended use, value basis, and effective date. Our guides to one-carat diamond value and different types of value explain those estimates.
Insurance documentation
Some specialist jewelry insurers offer coverage for lab-grown diamonds, but eligibility, documentation, limits, and settlement terms depend on the insurer and policy. Jewelers Mutual, for example, says it insures lab-grown diamonds; that is not a promise that every policy has the same terms. Ask your own insurer what it needs and whether it wants a detailed receipt, appraisal, grading report, or a combination.
Keep the purchase receipt, grading report, a clear photo of the finished piece, and any appraisal together. Confirm whether a value is a retail replacement estimate or another basis, and note the date. A report alone does not establish what an insurer will pay after a claim. For the appraisal process, see how to get jewelry appraised; for policy questions, see how to insure an engagement ring.
Collector’s record checklist
- Record the origin exactly as stated on the report or invoice.
- Save the laboratory, report number, report date, and relevant grading details.
- Photograph the stone and the finished setting in clear, neutral light.
- Keep purchase price, appraisal amount, and resale estimate in separate fields.
- Record the source and date for every estimate, then confirm insurance requirements directly with the carrier.
BigStash can keep the item’s photos, notes, and documents together in your private collection vault. For broader gemstone factors, read what affects gemstone value.