Lab-Grown Diamond Buying Guide

A diamond should be compared using more than one grade or a single product photo. Start with the 4Cs—cut, color, clarity and carat weight—then examine the diamond’s shape, millimetre dimensions, grading report, setting and the terms that apply to the finished ring.

AIMINIA sells lab-grown diamonds, not mined diamonds. “Lab-grown” describes origin; it does not replace the quality information contained in the 4Cs or a grading report.

A practical order for comparing diamonds

  1. Set a total budget for the complete ring, not only the center diamond.
  2. Choose a shape and compare actual length, width and depth measurements.
  3. Review cut or finish information and inspect realistic images or video.
  4. Compare color and clarity in the context of the setting and your visual preferences.
  5. Confirm whether the listed carat weight is center-stone weight or total carat weight.
  6. Read and verify the grading report when one is included.
  7. Check ring size, production time, return eligibility, resizing and warranty terms before ordering.

The 4Cs explained

Cut: how the facets work with light

Cut is not the same as shape. “Round,” “oval,” “pear” and “marquise” describe outlines. Cut describes how a diamond’s proportions, facet arrangement and workmanship influence brightness, fire, scintillation, durability and weight distribution.

For a standard round brilliant, an overall cut grade can provide a useful comparison. Grading systems and report formats vary by laboratory, so read what the grade on the specific report covers. GIA’s overall cut grade, for example, currently applies to standard round brilliant diamonds in its D-to-Z range; GIA does not assign that overall cut grade to oval, pear, marquise and other fancy shapes.

For a fancy shape, also examine face-up outline, millimetre dimensions, depth, girdle, polish, symmetry and moving video. A label such as “Excellent” should be interpreted according to the issuing laboratory and the exact report, rather than assumed to mean the same thing in every grading system.

Color: the amount of visible body color

The widely used D-to-Z scale begins at D (colorless) and continues toward increasing yellow or brown color. Differences between adjacent grades can be subtle and are assessed under controlled conditions. Metal color, diamond shape, size and lighting can affect how color appears in a finished ring.

A higher color grade is not automatically the best personal choice. Compare appearance and price, and confirm that the color statement applies to the diamond or group of diamonds described on the product page.

Clarity: inclusions and blemishes under standardized viewing

Clarity describes the relative absence of internal features (inclusions) and surface features (blemishes). In GIA’s system, grades run from Flawless (FL) through Included (I3), based on factors including the number, size, relief, nature and position of clarity characteristics viewed by trained graders under standardized conditions and 10× magnification.

“Eye-clean” is an informal appearance description, not a laboratory grade. Whether an inclusion is visible without magnification depends on the individual diamond, its size and shape, the viewer, lighting and viewing distance. Do not assume that a diamond is VS2 or higher simply because you cannot see an inclusion in an online image.

Carat weight: weight, not face-up size

One metric carat equals 0.20 grams and is divided into 100 points. Two diamonds with the same carat weight can have different face-up dimensions because their shapes, depths, girdles and proportions differ.

For a ring with accent stones, distinguish between center-stone carat weight and total carat weight. Total carat weight adds the weights of multiple diamonds and does not mean the center stone alone weighs that amount. Where a weight is approximate or represents a range, the product page should say so clearly.

Lab-grown origin should be clear

Laboratory-grown diamonds are produced in a controlled manufacturing environment rather than mined from the earth. The U.S. Federal Trade Commission advises sellers to place a clear origin term such as “laboratory-grown” or “laboratory-created” immediately before “diamond” and to make the disclosure easy to notice.

Origin alone does not prove a particular color, clarity, cut, environmental benefit or resale outcome. Compare the actual specifications and documentation. Avoid treating “lab-grown” as a guarantee that every producer, energy source or supply chain has the same environmental profile.

Choose shape by outline and actual dimensions

Shape changes how a diamond occupies space on the finger. Round brilliants emphasize a circular outline. Oval, pear and marquise shapes can look more elongated, while cushion and radiant shapes may appear squarer or more rectangular depending on their proportions.

For elongated shapes, divide length by width to calculate a length-to-width ratio. The ratio describes outline; it is not an overall quality grade. Two diamonds with the same ratio can still have different shoulders, symmetry, contrast and face-up appearance. Our oval diamond ratio and bow-tie guide explains how to compare ovals in more detail.

What a grading report does—and does not—tell you

What shoppers often call a “certificate” is more accurately described as a grading report. A report records the laboratory’s findings for the item submitted, which may include origin, measurements, carat weight, color, clarity, finish and other identifying information. A grading report is not the same as a monetary appraisal and does not promise a future selling price.

When an IGI report is included:

  1. Find the report number on the document.
  2. Use IGI Report Verification to retrieve the laboratory record.
  3. Compare the report number and listed details with the documentation and item supplied.
  4. Contact us before wearing or altering the ring if a material detail does not match.

IGI documentation in the current AIMINIA collection

The applicable product page identifies whether an IGI grading report is included. For the current collection, an IGI grading report is included with every ring except the Starry Sky Pavé Ring – D/VS1 and the Brilliant Light Seven-Stone Ring. Those two designs are sold without an IGI grading report; their displayed specifications are AIMINIA product specifications and are not presented as independently graded by IGI.

If documentation is important to your decision, contact us before ordering and confirm the report status for the exact product and configuration selected.

Evaluate the complete ring, not the diamond alone

The setting affects appearance, protection, height and maintenance. Four prongs create a more open view; six add more contact points around many round center stones. Neither option is damage-proof. Read our 4-prong vs. 6-prong guide and consider the specific stone shape, prong proportions and daily routine.

Metal also matters. AIMINIA’s current rings are offered in solid 18K gold configurations shown on their product pages. Confirm the selected metal color, ring size and care needs. For a broader comparison of gold fineness, see 14K vs. 18K gold.

Budget, price and long-term expectations

Compare the complete delivered price, including the selected carat option, metal, taxes or duties where applicable and any custom work. A diamond with the highest available grade in every category may cost more without producing the most meaningful visual difference for every buyer.

Jewelry should not be described as a guaranteed investment. Market prices and resale demand can change, and a grading report is not a valuation. Choose a ring because its design, documented characteristics, policies and price fit your needs.

Before you place an order

  • Confirm the product title and description clearly say “lab-grown diamond.”
  • Record the selected ring size, carat option and metal color.
  • Check whether carat weight refers to the center stone or total diamond weight.
  • Review millimetre measurements when available; do not infer diameter from carat alone.
  • Confirm whether an IGI grading report is included for that product.
  • Inspect realistic photos or video, particularly for oval, pear and marquise shapes.
  • Read the Ring Size Guide, Refund Policy, Production & Shipping Timeline and Limited Lifetime Craftsmanship Warranty.
  • Ask for clarification before ordering if any specification conflicts with an option or image.

Ready to compare designs? Browse all lab-grown diamond engagement rings, or begin with round, oval, marquise, halo and three-stone styles.

Frequently asked questions

Is D color always the best choice?

D is the beginning of the colorless end of the D-to-Z scale, but “best” depends on appearance, setting and budget. Adjacent color differences may be subtle, so compare the complete ring rather than choosing by one letter alone.

Does VS1 mean a diamond is flawless?

No. VS1 means Very Slightly Included 1 in the relevant grading system. It is different from Flawless (FL). Read the report for the diamond’s exact clarity grade and identifying details.

Does a one-carat diamond have a fixed diameter?

No. Carat is weight. Shape, depth, girdle and proportions affect the millimetre dimensions and face-up spread.

Is “Excellent cut” interpreted the same way for every shape?

No. Report formats and grading systems vary. GIA, for example, currently assigns an overall cut grade only to standard round brilliants in its D-to-Z range. For a fancy shape, read the issuing laboratory’s report and also evaluate measurements, outline, finish and visual performance.

Does every AIMINIA ring include an IGI grading report?

No. The current collection has two exceptions: the Starry Sky Pavé Ring – D/VS1 and the Brilliant Light Seven-Stone Ring. Each is sold without an IGI grading report. Check the documentation statement on the product page before ordering.

Is a grading report an appraisal?

No. A grading report records gemological findings; it does not state or guarantee a monetary value or future resale price.

Sources and further reading

Last reviewed: August 19, 2026. Product availability and documentation can change; the selected product page and order confirmation control for a specific purchase.