Lux Jewels Canada
Lab-Grown vs Natural Diamonds: The Real Differences
Lab-grown and natural diamonds are chemically, physically, and optically identical. Both are pure carbon in a cubic crystal structure with Mohs hardness 10. A gemologist can't tell them apart with standard tools - it requires advanced spectroscopy to detect the growth method. The main practical differences are price (lab-grown is 60-85% less than natural at comparable grades), resale value (natural retains more value), and environmental impact (mining vs. energy-intensive laboratory growth). I'm Suman Smith, founder of Lux Jewels. I became Canada's first exclusively lab-grown jewellery specialist in 2015 after more than eight years in the industry. I don't have a financial incentive to recommend natural diamonds - so I can give you the honest answer on this comparison.
The Chemistry: Identical at the Atomic Level
Both natural and lab-grown diamonds are:
- Pure carbon atoms
- Arranged in the same cubic crystal lattice (called the diamond cubic structure)
- Mohs hardness: 10 (the hardest natural substance)
- Refractive index: 2.418 (same for both)
- Density: ~3.5 g/cm³ (same for both)
- Chemical formula: C (pure carbon)
This is not a technicality. The atoms are identical. The crystal structure is identical. The optical behavior is identical.
A diamond tester (thermal conductivity meter) can't distinguish them. Standard gemological microscopy can't distinguish them. Only advanced spectroscopy (FTIR, PL spectroscopy at liquid nitrogen temperatures) can identify the growth method - and this has no practical consequence for a piece of jewellery you'll wear every day.
Appearance: Can You See the Difference?
No. A lab-grown D/VS1 round brilliant and a natural D/VS1 round brilliant are visually identical placed side by side.
The appearance of a diamond is captured in its grade:
- Colour determines how colourless the stone appears
- Clarity determines what's visible to a trained grader
- Cut determines how light moves through the stone - directly affecting sparkle
- Carat determines physical size
A natural H/SI2 and a lab-grown H/SI2 are the same to the eye. The quality comparison is always grade-to-grade, not natural-vs-lab.
Price: The Most Significant Practical Difference
This is where the real difference is.
Current Canadian market (2026):
| Quality | Natural Diamond | Lab-Grown Diamond | Price Difference |
|---|---|---|---|
| 1ct round, G/VS2, Excellent | C$8,000-C$12,000 | C$1,400-C$2,200 | Lab-grown 75-85% less |
| 1.5ct oval, F/VS1 | C$16,000-C$25,000 | C$2,500-C$4,500 | Lab-grown 80-85% less |
| 2ct emerald, G/VS2 | C$30,000-C$50,000+ | C$4,000-C$8,000 | Lab-grown 80-90% less |
These are approximate ranges. Individual stones vary based on specific grade, cut quality, and supplier.
What the price difference means in practice: A budget that buys a 0.70ct natural solitaire typically buys a 1.5-2.0ct lab-grown solitaire of equivalent or better colour and clarity grade.
Resale Value: The Honest Answer
Natural diamonds retain more resale value than lab-grown diamonds. This is true and worth knowing.
Why natural retains more value:
- Scarcity (limited supply from mines)
- Established secondary market (auction houses, vintage dealers, estate sales)
- Cultural perception (decades of "diamonds are forever" positioning)
Why lab-grown resale is lower:
- Supply is not limited - more can always be grown
- The market is newer and secondary market infrastructure is still developing
- Prices have dropped significantly in the lab-grown market since 2020
What this means for your decision:
If you're buying an engagement ring as a financial investment, natural retains more resale value. But engagement rings typically aren't investments - they're worn and kept. Very few people sell their engagement rings in practice.
The relevant question is whether you'd rather have:
- A 0.70ct natural diamond you might resell for 30-40% of purchase price someday
- A 1.5ct lab-grown diamond at the same budget that you'll wear every day
Most clients I've worked with choose the larger, higher-quality stone they'll actually wear over the smaller stone with better theoretical resale. But that's a personal decision, and both are valid.
IGI and GIA Grading: Same Process, Separate Certificates
IGI and GIA grade lab-grown diamonds on the same 4Cs scale as natural diamonds.
Key distinction: IGI has separate certificate designs for lab-grown (currently light blue) vs natural (beige/tan). This is primarily for transparency in the trade - the grading criteria are identical.
The laser inscription on a lab-grown diamond's girdle typically notes "Lab-Grown" alongside the report number.
Environmental Impact: More Complex Than It Appears
The environmental comparison is not as clear-cut as some marketing suggests.
Mining environmental impact:
- Land displacement (open-pit mines in Botswana, Russia, Canada, Namibia)
- Water use
- 160kg of CO₂ per carat produced (estimate varies by source)
- Carbon Disclosure Project figures: significant greenhouse gas emissions
Lab-grown environmental impact:
- Very high energy use - CVD and HPHT growth requires sustained high temperatures
- The carbon footprint depends almost entirely on the energy source
- Lab-grown grown on renewable energy has a very low carbon footprint
- Lab-grown grown on coal-powered grids (common in China) can have a higher carbon footprint per carat than some mining operations
- Studies vary in their conclusions - the comparison is energy-source dependent
The honest summary: Lab-grown is generally better for land and water impact. Its carbon footprint depends on the energy source. Mined diamonds from Canada (regulated, lower land impact than African or Russian operations) are sometimes cited as more environmentally responsible than lab-grown from high-carbon-grid factories.
If environmental impact is a key factor in your decision, ask your jeweller where the stones are grown and whether the facility uses renewable energy.
What's the Same: A Summary
| Feature | Natural Diamond | Lab-Grown Diamond |
|---|---|---|
| Chemical composition | Pure carbon | Pure carbon |
| Crystal structure | Cubic lattice | Cubic lattice |
| Hardness (Mohs) | 10 | 10 |
| Refractive index | 2.418 | 2.418 |
| Grading scale | 4Cs (IGI/GIA) | 4Cs (IGI/GIA) |
| Appearance | Identical at same grade | Identical at same grade |
| Daily durability | Identical | Identical |
What's Different: A Summary
| Feature | Natural Diamond | Lab-Grown Diamond |
|---|---|---|
| Price | C$8,000+ for 1ct G/VS2 | C$1,400-C$2,200 for 1ct G/VS2 |
| Resale value | Retains more value | Lower resale |
| Supply | Finite (mined) | Not limited |
| Origin | Geological | Laboratory |
| Certificate | Separate IGI/GIA certificate design | Separate IGI/GIA certificate design |
| Environmental impact | Mining impact + CO₂ | High energy use + CO₂ (energy-source dependent) |
Why I Work Exclusively with Lab-Grown
I made the decision in 2015 to dedicate Lux Jewels entirely to lab-grown stones. I don't sell natural diamonds. Here's why:
The quality-to-price ratio for lab-grown is so significant that I couldn't continue presenting natural diamonds as a serious option for most Canadian couples. A client with a C$5,000 budget choosing between a 0.65ct natural and a 1.5ct lab-grown of equivalent grade is making a clear decision if they understand what they're actually comparing.
I also believe in transparency. Most jewellers sell both - so they have a financial incentive to steer buyers toward higher-margin natural stones. I don't have that incentive.
That said: if a client specifically wants a natural diamond for sentimental or investment reasons, I tell them to find a good natural diamond dealer and I'm happy to help them evaluate any stone via a No-BS Call.
Ready to talk through your options? Book a free consultation and I'll walk you through both sides of this comparison with no agenda.
Have Questions?
Frequently Asked Questions
Not with standard tools. A standard diamond tester, loupe, or microscope can't distinguish lab-grown from natural. Advanced spectroscopy (FTIR or photoluminescence at liquid nitrogen temperatures) is required - equipment not found in standard jewellery stores.
They'll retain value as a piece of jewellery, but not as a financial investment in the way a rare natural diamond might. Resale value is lower for lab-grown because supply isn't constrained. Most couples don't sell their engagement rings, but it's honest to acknowledge the resale difference.
Yes. The FTC, IGI, GIA, and every major gemological body classify lab-grown diamonds as real diamonds. The FTC updated its diamond definition in 2018 to remove the word "naturally" after recognizing that lab-grown diamonds are chemically and physically identical to mined diamonds.
Production cost. Mining a natural diamond requires billion-dollar extraction infrastructure, geological rarity, and an established supply chain going back centuries. Lab-grown diamonds are manufactured in a facility - the process is expensive but scalable, and supply isn't limited by geological rarity.
Work With Suman
Two Ways to Start
Free Consultation
A 30-40 minute video call to talk through what you're looking for. No pressure, no pitch. We'll cover shapes, stones, settings, and budget. You'll leave with a clear direction whether you book with us or not.
Book Free ConsultationFree. No purchase required. 30-40 minutes via Zoom or Google Meet.No-BS Diamond Buying Call
A paid 30-minute call for buyers who already have quotes or stones in mind. I'll review the specific stone grades, assess whether the price is fair for the Canadian market, and tell you directly what to buy or avoid.
Book the No-BS Call$199 for 30 minutes. Pricing subject to change. Confirm at stan.store/luxjewels.