Why Similar Lab Grown Diamonds Have Different Prices

A short product title helps narrow a search, but it does not describe every characteristic of a diamond. Start with the full specifications and laboratory documents for the stones being offered.

There are three different comparisons you might be making:

This distinction prevents a common mistake: attributing every price difference to diamond quality before checking whether the offers are equivalent.

Keep the original quotations and report references together. That makes it easier to see whether a later price change concerns the same diamond or a replacement option.

Carat measures weight. It does not directly describe a diamond’s length, width or visible outline. Two diamonds with equal carat weights can therefore have different measurements. GIA’s explanation of carat weight.

With an oval, for example, compare the length and width as well as the stated weight. One stone may have a longer, narrower outline, while another appears broader. Neither outline establishes better value for every buyer.

Depth and proportions also deserve attention. GIA explains that proportion combinations influence a diamond’s appearance and its interaction with light. A cut grade can encompass multiple combinations of proportions. GIA’s diamond cut guidance.

When a seller attributes a higher price to superior cutting, ask what supports that description. Relevant information may include the applicable cut assessment, proportions, polish, symmetry and a clear view of the actual diamond.

A more expensive stone may have characteristics you prefer. Establish that preference through the evidence supplied, rather than using price as a substitute for examination.

A clarity grade summarises an assessment of features within and on a diamond. Their size, number, location, nature and visibility contribute to grading. Diamonds within the same clarity category can have different combinations of those features. GIA’s clarity guidance.

For two stones carrying the same clarity grade, review the available comments, diagrams and imagery. Ask whether a particular feature is visible under ordinary viewing conditions and where it sits within the stone.

A magnified image is useful for locating characteristics, but consider the scale at which you are viewing it. Your assessment should include how the diamond looks at the distance at which it will normally be worn.

Colour comparisons also benefit from consistent conditions. Laboratories assess colour under controlled lighting, using established reference stones. Photographs taken against different backgrounds or under different lighting cannot provide the same basis for comparison. GIA’s explanation of colour assessment.

If colour is part of the explanation for a price premium, ask to compare the actual stones under similar conditions.

Read the document behind the listing. Establish its issuer, service, date and the information it provides before comparing the advertised grades.

IGI’s laboratory-grown diamond reports provide origin and quality information. IGI also distinguishes its grading reports from appraisals: the report documents characteristics rather than assigning a monetary valuation. IGI’s laboratory-grown diamond report guidance.

Report terminology can differ. GIA’s current quality assessment for eligible colourless to near-colourless laboratory-grown diamonds uses Premium and Standard categories. Its laboratory-grown coloured diamond services use separate formats. GIA’s current laboratory-grown diamond services.

A retailer’s description of a stone as “premium”, “luxury” or “commercial” needs its own explanation. Ask whether the term refers to a named laboratory assessment, a defined selection standard or the seller’s product range.

For detailed help with the documents, read our IGI report guide and GIA report guide.

Growth method may be another difference between two listings. Where information about CVD, HPHT or post-growth treatment is relevant, check what the report actually records. IGI notes that such information may appear depending on the report and service. IGI’s report guidance.

Market observations can also show differences between growth categories. Edahn Golan’s Q2 2026 commentary describes HPHT diamonds as typically trading at a discount within the market discussed. That observation does not establish a fixed price relationship for every pair of diamonds. Edahn Golan’s Q2 2026 analysis.

If a seller uses the growth method to explain a higher price, ask how that explanation relates to the particular stone. Review its assessed characteristics and appearance alongside the production information.

A selling price includes the seller’s commercial decisions. Acquisition costs, operating expenses, margins and the services included in an offer can contribute to the amount quoted.

Edahn Golan’s analysis distinguishes wholesale trading prices from retail purchase prices and describes how retailer markups have changed as wholesale costs declined. This shows why a change in underlying trading prices need not produce an identical change in every retail offer. Edahn Golan’s pricing analysis.

If two sellers confirm that they are offering the same individual diamond, focus on the commercial differences between their quotations. Ask about availability, delivery, payment conditions, inspection arrangements and the applicable return terms.

A description such as “wholesale” or “manufacturer-direct” does not provide enough information to evaluate the offer. Compare the actual amount and terms being proposed.

Compare quotations issued at similar times. An older offer and a current listing may reflect different market conditions or pricing decisions.

Market movement also differs between categories. In Q2 2026, Golan reported an average annual wholesale price decline of 13%, while one-carat rounds rose by 1%. The benchmark covers specified trade transactions in Mumbai and Surat. It provides market context for comparing dates, rather than a price for an individual retail purchase. Edahn Golan’s dated wholesale analysis.

Next, establish the basis of each amount. Check the currency, whether the figure is per carat or for the whole stone, and whether applicable taxes, delivery or other charges are included.

Keep loose-stone and finished-jewellery quotations distinct. If one price includes a setting, metalwork or additional stones, those components need to be identified before you attribute the difference to the centre diamond.

Our lab grown diamond price guide explains quotation structure in more detail.

Consider two hypothetical oval diamonds advertised as 2.00 carats, F colour and VS1 clarity.

The headline descriptions match. Their reports, however, show different measurements and clarity characteristics. One seller provides a clear video of the individual stone; the other initially supplies only a representative image. One quotation includes delivery and applicable tax, while the other lists a stone price before those charges.

You now have several differences to resolve. Request the missing information, compare the actual diamonds and bring both quotations to the same basis.

Once those details are established, ask the higher-priced seller to identify what supports the premium. You can then decide whether the difference concerns a feature you prefer, a service you value or simply a higher asking price.

To discuss a laboratory-grown diamond requirement, contact Uniglo Diamonds with your preferred shape, size, specifications and delivery destination.

Ask for the individual stone’s documentation and a current quotation showing what is included. Where options have different prices, request an explanation of the relevant stone characteristics and purchase terms.