What is the difference between GIA and IGI for lab-grown diamonds?

Both GIA and IGI grade lab-grown diamonds using the same 4Cs methodology. GIA is the most recognised laboratory globally. IGI is widely used for lab-grown diamonds and its reports are accepted by the trade worldwide. At Ting Diamond, we carry both GIA and IGI certified lab-grown stones.

Lab Grown Diamonds in Hong Kong: 2026 Buyer's Guide

Q: How much cheaper are lab-grown diamonds in Hong Kong?

In 2026, lab-grown diamonds in Hong Kong are typically 60–80% less expensive than equivalent natural diamonds of the same carat, cut, colour and clarity. A 1ct lab-grown diamond starts from approximately HK$2,300.

Q: Do lab-grown diamonds hold their value?

Lab-grown diamond prices have declined significantly as production has scaled. They should be purchased for their beauty and value at point of purchase, not as an investment. Natural diamonds generally retain resale value better than lab-grown stones.

Lab-grown diamonds have transformed the jewellery market in Hong Kong. In 2026, a 1-carat lab-grown diamond starts from approximately HK$2,300 — compared to HK$15,000–30,000+ for an equivalent natural stone. This guide explains what lab-grown diamonds are, how they compare to natural diamonds, and what to look for when buying in Hong Kong.

Feature	Lab-Grown Diamond	Natural Diamond
Chemical composition	100% carbon ✓	100% carbon ✓
Hardness (Mohs)	10 ✓	10 ✓
Certification	GIA / IGI	GIA / IGI / AGS
1ct price (HK$, 2026)	From ~$2,300	From ~$15,000+
Resale value	Lower	Higher
Environmental impact	Lower mining impact	Mining required

What Are Lab-Grown Diamonds?

Lab-grown diamonds (also called man-made, synthetic or cultured diamonds) are produced in a laboratory using one of two processes: HPHT (High Pressure High Temperature) or CVD (Chemical Vapour Deposition). Both replicate the natural conditions under which diamonds form in the Earth's mantle — the result is a crystal that is physically and chemically identical to a mined diamond.

Even under a professional loupe, a gemologist cannot distinguish a lab-grown diamond from a natural one without specialised equipment. The difference only shows up under spectroscopic analysis.

GIA vs IGI: Which Certificate for Lab-Grown Diamonds?

Both the GIA (Gemological Institute of America) and IGI (International Gemological Institute) grade lab-grown diamonds using the same 4Cs methodology — Cut, Colour, Clarity and Carat weight. Here's how they differ:

GIA is the most recognised laboratory globally and is widely trusted by jewellers and consumers. GIA lab-grown reports use the same grade designations as their natural diamond reports.
IGI is the most common certificate for lab-grown diamonds worldwide and is accepted by all major jewellery trade organisations. IGI-certified lab-grown diamonds are typically priced slightly below equivalent GIA-graded stones.
At Ting Diamond, our GIA-certified gemologists can walk you through both report types and help you compare stones on an apples-to-apples basis.

Lab-Grown Diamond Prices Hong Kong 2026

Lab-grown diamond prices have fallen 20–30% year-on-year as CVD production capacity from China and India continues to scale. As of mid-2026, indicative prices in Hong Kong for IGI-certified lab-grown round brilliants:

0.5ct (E–F, VS1–VS2, Excellent): from HK$1,200–1,800
1.0ct (E–F, VS1–VS2, Excellent): from HK$2,300–4,500
1.5ct (E–F, VS1–VS2, Excellent): from HK$3,800–7,000
2.0ct (E–F, VS1–VS2, Excellent): from HK$5,500–10,000

Prices fluctuate with supply. Browse our live inventory below for current pricing.

Should You Buy Lab-Grown or Natural?

This depends on what matters most to you:

Budget-maximiser: Lab-grown lets you buy a significantly larger or higher-quality stone for the same budget.
Sentimental rarity: Natural diamonds are billions of years old — each is unique. Some buyers value this irreplaceable origin story.
Investment: Natural diamonds have historically retained resale value better. Lab-grown diamond prices have declined sharply.
Environmental consideration: Lab-grown avoids mining, but the CVD process is energy-intensive. The net environmental picture depends on the energy source.

Our GIA-certified gemologists Pete and Winnie are happy to discuss this in person and show you side-by-side comparisons. Book an appointment →

Browse Our Lab-Grown Diamond Inventory

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Frequently Asked Questions

Are lab-grown diamonds real diamonds?

Yes. Lab-grown diamonds are chemically, physically and optically identical to mined diamonds — same carbon crystal structure, same hardness (Mohs 10), same brilliance. The only difference is their origin.

How much cheaper are lab-grown diamonds in Hong Kong?

In 2026, lab-grown diamonds are typically 60–80% less expensive than equivalent natural diamonds of the same specification. A 1ct IGI lab-grown starts from approximately HK$2,300.

Can I use a lab-grown diamond for an engagement ring?

Absolutely. Lab-grown diamonds are durable (Mohs 10) and wear exactly like natural diamonds. Many couples in Hong Kong choose lab-grown stones for engagement rings precisely because they can afford a larger, higher-clarity stone within their budget.

Do lab-grown diamonds hold their value?

Lab-grown diamond prices have declined significantly as global production has scaled. They should be purchased for their beauty and value at point of purchase, not as a financial investment. Natural diamonds generally retain resale value better.

What is the difference between CVD and HPHT lab-grown diamonds?

CVD (Chemical Vapour Deposition) and HPHT (High Pressure High Temperature) are the two production methods. Both produce gem-quality diamonds. CVD currently dominates production volume. Neither is superior in terms of quality — the 4Cs grading applies equally to both.