Natural Diamond Buying Guide

Begin with the intended jewellery piece. A centre stone for an engagement ring, a pair of diamonds for earrings and stones for a bracelet involve different selection decisions. Establish the wearer’s preferred appearance, approximate dimensions and any setting requirements before narrowing the search by grades.

For a gift, confirm whether natural origin matters to the recipient. Laboratory-grown diamonds are also diamonds, but they have a different production origin. Our lab-grown versus natural diamond comparison explores that choice in more detail.

Set a budget for the complete purchase. If you are commissioning a ring, allow for the setting, metalwork and any additional stones alongside the centre diamond. Tell the seller whether your budget includes applicable taxes, delivery and other charges so the options presented are relevant.

The 4Cs provide a starting point for understanding a diamond’s assessed characteristics. They become more useful when you connect each description with the individual stone and the jewellery you intend to make.

Cut concerns the diamond’s design and craftsmanship, including the arrangement and proportions of its facets. These influence its interaction with light. Shape describes its outline, such as round or oval. GIA’s diamond cut guidance.

Review the available cut assessment, proportions, polish and symmetry together. Ask to see the diamond moving under different lighting so you can assess its appearance alongside the recorded information.

GIA’s D-to-Z scale describes diamonds within the normal colour range, from colourless to light yellow, brown or grey. Laboratories assess colour under controlled conditions using established reference stones. GIA’s explanation of diamond colour.

When deciding what you prefer, compare shortlisted stones under similar lighting and against similar backgrounds. Consider their appearance in the intended setting. A higher colour grade may matter to your preferences, but establish what difference you can see before deciding whether to pay more.

Clarity grading considers inclusions and blemishes, including their size, number, nature, location and relief. GIA assesses clarity at 10× magnification, and many characteristics are difficult to see without magnification. GIA’s diamond clarity guidance.

Ask which characteristics influence the grade and whether they are visible under ordinary viewing conditions. If a seller describes a diamond as “eye-clean”, ask what viewing distance and conditions that description assumes. Our SI versus VS diamond guide examines this decision further.

Carat measures weight. One metric carat equals 200 milligrams, and equal carat weights do not establish identical diamond dimensions. GIA’s explanation of carat weight.

Compare the recorded length, width and depth as well as the weight. This helps you understand the diamond’s outline and whether it suits the proposed setting.

For the broader explanation of these assessments, read our diamond 4Cs guide.

Natural and laboratory-grown diamonds can be fashioned into the same familiar shapes. Your shape preference therefore concerns the finished diamond’s appearance, while origin remains a separate purchase choice.

Within one shape, outlines and proportions can vary considerably. Two ovals may have different lengths and widths; two cushions may present different outlines and facet patterns. Compare actual stones rather than relying entirely on a shape name. GIA explains how shape, facet arrangement and proportions contribute to a diamond’s design. GIA’s shape and cut explanation.

Our diamond shape guide introduces the available outlines. If you are interested in older cutting styles, explore our old-cut diamond guide and ask about the particular stone’s cutting style and documented history.

Request the complete report associated with the individual stone. Establish the laboratory, report number, service and recorded characteristics before relying on a seller’s summary.

Report formats differ. For example, GIA’s Diamond Grading Report includes a plotted clarity diagram, while its Diamond Dossier provides a different format. Identify which service the diamond received and what information that document supplies. GIA’s natural diamond report services.

Where an online verification service is available, check the report reference with the issuing laboratory. GIA provides Report Check. Then ask the seller or a qualified professional to demonstrate how the physical diamond matches the report, using its recorded characteristics and any applicable inscription.

A report lookup checks the laboratory record. Matching that record to the stone being offered is another part of the purchase process.

Our diamond certificate guide explains document types, while our GIA versus IGI guide addresses comparisons between laboratory services.

Natural origin and treatment status describe different things. A natural diamond may have undergone treatment to alter its colour or clarity. Ask what treatments have been disclosed and how they affect the information accompanying the purchase. GIA explains both treatment methods and the limits of its reporting services for treated diamonds. GIA’s diamond treatment guidance.

For a coloured diamond, also establish whether the colour is natural or the result of treatment. This distinction is part of the information covered by appropriate coloured-diamond laboratory services. GIA’s explanation of coloured diamond reports. Our fancy coloured diamond guide provides a starting point for exploring this category.

Fluorescence is another characteristic to understand. Some diamonds emit visible light when exposed to ultraviolet light. Its recorded intensity does not, by itself, tell you whether you will prefer the stone’s appearance. Compare the actual diamond under different lighting, including daylight. GIA’s fluorescence guidance.

For a closer look at that decision, read our diamond fluorescence guide.

A useful price comparison begins with the complete specifications of the stones being offered. Record the report reference, exact weight, measurements and assessed characteristics beside each quotation.

Next, establish what each amount covers. Check the currency, quotation date, whether the figure is per carat or for the whole stone, and which charges are included. If one offer includes finished jewellery, identify the setting and additional components before comparing it with a loose-diamond price.

Ask the seller to explain any premium in terms of the particular diamond or the services included. A higher asking price alone cannot explain which characteristics you will prefer.

For example, imagine two hypothetical oval diamonds advertised with matching carat, colour and clarity descriptions. One quotation includes a setting and delivery; the other covers only the loose stone. Their headline prices cannot answer which diamond offer is more suitable until those differences are resolved.

Buyers considering a larger centre stone can also consult our three-carat natural diamond price guide.

Establish who is selling the diamond, who will supply it and how its availability will be confirmed. Ask how you can inspect the stone and obtain a current quotation before committing to the purchase.

If the country where the diamond was mined matters to you, request documentation that specifically supports that information. A standard grading report and a report providing geographical origin have different scopes. GIA’s Diamond Origin Report is a separate service that includes country-of-origin information for eligible diamonds. GIA’s explanation of report types and origin information.

Review payment arrangements, delivery responsibilities, inspection opportunities and the applicable return terms. Where a seller offers buyback or upgrade arrangements, request the conditions in writing and establish whether they apply to your purchase.

Jewellers comparing supply partners can use our natural diamond supplier-selection guide. For the final purchase review, consult our diamond buying checklist.

The diamond and setting should be considered together. Confirm that the selected stone’s measurements suit the design and that the finished piece is comfortable and appropriate for its intended use.

Diamond is highly resistant to scratching, but it can still chip or break under an impact. Setting security and protection around vulnerable areas therefore deserve attention. Follow care instructions appropriate to the diamond, any treatments and the complete jewellery piece. GIA’s diamond care guidance.

Retain the invoice, laboratory documents and agreed purchase terms. These records help identify what was supplied and provide a useful reference for future servicing or enquiries.

Use the resources below for decisions specific to the jewellery you are considering or the next stage of ownership.

When you are ready to compare individual stones, browse our natural diamond inventory and request the documentation and current quotation for the options that interest you.

To discuss a natural diamond purchase, contact Uniglo Diamonds with your preferred shape, approximate size, budget and intended jewellery piece.

Include your delivery destination and any requirements concerning laboratory documentation, treatment disclosure or sourcing information. If you have already identified a stone in the inventory, provide its reference so the discussion can focus on that particular diamond and its current quotation.