Updated 27 October 2026 · Syna Jewellery Journal · Brisbane, Australia
The conversation around natural and laboratory-grown diamonds has changed. Laboratory-grown diamonds have made larger stones accessible to more buyers, while the natural diamond market has faced a more complicated period of changing demand and supply. Neither category is automatically the right choice for every person.
At Syna Jewellery, our starting point is simple: understand what you are buying, what the reports actually say, and what matters most to you before choosing a diamond for a bespoke piece.
Are laboratory-grown diamonds real diamonds?
Yes. A laboratory-grown diamond is diamond, not cubic zirconia or moissanite. It has essentially the same crystal structure and key chemical, physical and optical properties as a natural diamond. The primary difference is origin: natural diamonds form in geological environments, while laboratory-grown diamonds are produced using technologies such as high-pressure, high-temperature (HPHT) or chemical vapour deposition (CVD).
That does not mean every diamond looks equally beautiful. Cut quality, proportion, light performance, inclusions and the suitability of a setting still matter. Professional testing and appropriate documentation are important when confirming origin.
What changed in diamond certification?
One of the most relevant developments for buyers is the change introduced by the Gemological Institute of America (GIA). From 1 October 2025, GIA moved to an updated quality-assessment approach for qualifying colourless-to-near-colourless laboratory-grown diamonds. Rather than applying its natural-diamond colour and clarity nomenclature in the same way, GIA uses descriptive categories of Premium or Standard for stones that meet the defined requirements.
Natural diamonds continue to be evaluated through established systems, including the familiar 4Cs — cut, colour, clarity and carat weight. Other laboratories may use different reporting systems for laboratory-grown stones, so always look at which laboratory issued the document and what the document actually measures. An appraisal, a grading report and a resale offer are not the same thing.
Source: GIA, updated laboratory-grown diamond services (26 August 2025).
What do the latest reports say about natural diamond prices?
The market cannot be reduced to “natural prices are always falling” or “natural diamonds are recovering everywhere.” In its 6 October 2026 report on September trading, Rapaport found improvements in selected natural polished-diamond categories. Its Rapaport Trade Diamond Index (RAPI) increased by 3.2% for 0.30-carat, 2.5% for 0.50-carat, 0.3% for 1-carat and 1.5% for 3-carat round-diamond categories during September.
Those figures reflect defined trade asking-price categories, not the price movement of every diamond, and not the amount a customer could receive when selling an individual ring. Rapaport also noted that some smaller, lower-quality natural stones remained under pressure from competition with laboratory-grown diamonds. Demand varied significantly by size, quality and shape.
Source: Rapaport, Small Diamonds Lead Price Gains in September (6 October 2026).
Why are laboratory-grown diamonds often much less expensive?
Growing production capacity, competition among suppliers and changing manufacturing economics have made laboratory-grown diamonds widely available at prices often substantially below comparable natural stones. The price difference varies by carat weight, quality, supplier and retailer; a single percentage should not be treated as a universal market quotation.
For many couples, that lower entry price offers a practical advantage: they may be able to choose a larger centre stone or direct more of their budget toward a well-made setting, platinum or gold, or fine craftsmanship. But consumers should not assume that a laboratory-grown diamond bought today can later be resold near its purchase price.
What do the latest reports say about laboratory-grown diamond prices?
Laboratory-grown prices are now moving differently by size. As reported from Edahn Golan's Lab-Grown Wholesale Price List, a benchmark widely followed in the trade, wholesale laboratory-grown prices fell by about 13% year on year in the second quarter of 2026, with the declines concentrated in larger stones. Over the same period, 1-carat rounds were reported up about 1% — the first time that size had firmed since laboratory-grown diamonds became a mainstream category.
Like the natural-diamond figures above, these are trade benchmarks rather than retail prices or resale values, and they can change quickly.
On certification: since GIA changed its approach for colourless laboratory-grown stones, most laboratory-grown diamonds offered in Australia come with a report from the International Gemological Institute (IGI), which has become the working standard for this category. Whichever laboratory issued the report, check that its details match the stone — including any report number inscribed on the girdle.
Natural versus laboratory-grown: a practical comparison
| Consideration | Natural diamond | Laboratory-grown diamond |
|---|---|---|
| Origin | Geological formation | Manufactured by HPHT or CVD |
| Material | Diamond | Diamond |
| Typical purchase price | Usually higher for comparable specifications | Usually lower |
| Availability | Varies with natural supply and grading | Expandable manufacturing supply |
| Common grading report | GIA and other established laboratories | Mostly IGI; GIA uses Premium or Standard categories |
| Confirming origin | Requires professional testing | Requires professional testing |
| Resale | Variable; not guaranteed | Often limited; not guaranteed |
Is one option more ethical or environmentally responsible?
Be cautious of simple labels. Mining can involve significant environmental and social impacts; laboratory production also requires energy, equipment and supply chains. The overall footprint depends on the specific producer and methods. Claims such as “carbon-neutral,” “zero impact” or “conflict-free” need credible evidence and clearly defined scope. A decision is stronger when based on traceable information rather than slogans.
What about value and resale?
Jewellery is primarily a personal purchase, not a guaranteed investment. The amount someone may receive in the secondary market depends on demand, condition, documentation, stone specifications, metal content and the buyer. Even a high-quality natural diamond may resell for substantially less than its original retail price. A laboratory-grown diamond may have even less secondary-market demand. Neither should be promoted as an assured store of value.
If resale or inheritance is a major consideration, discuss it before purchasing. A certified natural diamond may be more appropriate for some clients; a laboratory-grown diamond may offer better immediate size or design value for others. The answer should follow the client's priorities rather than a sales script.
Which should you choose for a bespoke engagement ring?
Ask yourself four questions:
- What is my real budget? Include the complete ring, not just the centre stone.
- What matters most? Geological origin, size, rarity, design, light performance or craftsmanship?
- How will it be worn? Everyday comfort, durable setting design and future maintenance matter.
- What documentation is available? Confirm origin, measurements, identifying marks and the laboratory report when applicable.
At Syna Jewellery, we can discuss natural and laboratory-grown options without treating either as inherently superior. We consider your preferred design, budget and intended wear, then help you understand the trade-offs before a stone is selected.
Considering a bespoke ring in Brisbane or Australia-wide? Book a private jewellery consultation to discuss diamond options and design ideas.
Sources and reporting dates
- GIA — Updated laboratory-grown diamond quality assessment, 26 August 2025 (effective 1 October 2025)
- GIA — Current laboratory-grown diamond services
- Rapaport — September 2026 diamond price changes, published 6 October 2026
- Edahn Golan Diamond Research — Lab-Grown Wholesale Price List, Q2 2026 (as reported in trade coverage)
This article is general consumer education based on sources available on 27 October 2026, not a personal investment, valuation or resale recommendation. Prices, laboratory services and market conditions can change.
