Lab Grown vs Natural Diamond: The Complete Buying Guide

How to decide between lab grown and natural, what to look for when buying, where to shop, and the red flags that indicate a bad deal regardless of which type you choose.

Step 1: Decide What Matters Most to You

The decision between lab grown and natural diamond starts with understanding your own priorities. Neither is universally better. The right choice depends on what you value most.

Choose natural diamond if:

  • - The sentimental significance of a billions-of-years-old stone matters to you or your partner
  • - You intend the ring to be a family heirloom with long-term monetary value
  • - You want a stone with some store-of-value properties over very long periods
  • - The provenance and rarity of a natural stone is important to your values

Choose lab grown diamond if:

  • - Maximising the visual impact of your budget is the priority
  • - You want a larger, higher-colour, or higher-clarity stone than you could afford in natural
  • - Environmental concerns about mining influence your decision
  • - You are pragmatic about the investment case for diamonds of either type

Step 2: Set Your Budget and Target Specifications

Decide on a budget first, then work out what specifications you can achieve within it for each diamond type. Use our comparison calculator on the homepage to see exactly what a given budget buys in natural versus lab grown at your target 4Cs.

For engagement rings, some useful benchmarks:

  • -$3,000 budget: buys approximately a 0.5-0.7 carat natural diamond (G-H, VS2) or a 1.5-2.0 carat lab grown (G-H, VS2)
  • -$5,000 budget: buys approximately a 0.8-1.0 carat natural (G-H, VS2) or a 2.5-3.0 carat lab grown (G, VS2)
  • -$10,000 budget: buys approximately a 1.2-1.5 carat natural (G, VS1) or a 4-5 carat lab grown (G, VS1)

These are approximate guides and vary significantly by retailer, current market conditions, and precise quality grades.

Step 3: Understand the 4Cs Tradeoffs

Prioritise cut above all other factors. A poorly cut diamond of high colour and clarity looks worse than a well-cut diamond of middling colour and clarity. Cut determines how brilliantly the stone sparkles. Always buy Excellent or Ideal cut.

On colour and clarity, compromise strategically:

  • -Colour: G-H grades appear white to the naked eye in most settings. D-F grades are colourless and command a significant premium that is often not visible without specialist magnification.
  • -Clarity: VS2 is the sweet spot for most buyers. Inclusions at VS2 are invisible to the naked eye. VVS and FL grades are premium for those who want perfection under magnification.
  • -SI1 clarity can be a good value choice if you review the specific stone's certificate and images to confirm inclusions are not in a visible location.

Step 4: Where to Buy

Online retailers generally offer better prices than high-street jewellers because of lower overheads. Reputable online options:

  • -James Allen: excellent 360-degree imagery of individual stones, competitive pricing, strong for natural and lab grown
  • -Blue Nile: large selection, price matching available, good for natural diamonds
  • -Brilliant Earth: strong focus on ethical sourcing and lab grown, premium pricing but strong transparency
  • -Clean Origin: lab grown specialist with competitive pricing
  • -Whiteflash and Brian Gavin: premium vendors for the highest-cut-quality natural diamonds

High-street jewellers (Tiffany, Cartier, local independent jewellers) offer the advantage of in-person viewing and the reassurance of established brands, but their prices are substantially higher for equivalent stone quality. The brand premium on a Tiffany setting is real but does not reflect a quality difference in the diamond.

Red Flags to Avoid

Specific warning signs when buying diamonds:

  • -No GIA or IGI certificate: never buy a significant diamond without a reputable grading report
  • -Pressure selling or "today only" pricing: legitimate diamond retailers do not use these tactics
  • -Unclear disclosure of lab grown versus natural: any seller who does not clearly disclose this is breaking FTC or Trading Standards rules
  • -EGL certificates instead of GIA/IGI: EGL (European Gemological Laboratory) has a reputation for lenient grading that inflates the apparent quality of stones it certifies
  • -Prices significantly below market for supposedly high-quality natural diamonds

A GIA certificate number can be verified directly on GIA's website. IGI report numbers can similarly be verified. Always verify the certificate matches the stone you are shown.