2025 Lab Grown Diamond Price Guide｜GIA & IGI Comparison + Natural Diamond Pricing
- RAGAZZA
- Jul 20
- 4 min read
Updated: Aug 20
As global consumption habits change, the price of lab grown diamonds has become the focus of more and more consumers. In 2025, whether it is an engagement ring, daily wear or investment collection, the price performance and market position of lab grown diamonds have changed significantly. The following will sort out the current selling prices of major carats, certificate differences and price differences with natural diamonds from a professional perspective to help you rationally evaluate the value of diamonds.
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Overview of lab grown diamond price trends
In 2025, the global supply of lab grown diamonds will continue to rise, especially the productivity of CVD lab grown factories in China and India will increase significantly, causing the overall lab grown diamond price to fall by 20% to 30% on average compared with 2024. Among them, the decline is most obvious for uncertified products or diamonds with medium and low purity ; while high-quality lab grown diamonds with GIA certification still retain a certain price stability and brand premium.
Lab Grown Diamond Price List 2025 (Comparison between GIA and IGI)
Carat | Engagement Level GIA Certification (D / VS+ / 3EX) | General IGI certificate or no certificate |
0.5 ct | From HK$3,000 (NT$12,000) | About HK$1,800 (NT$7,200) |
1.0 ct | From HK$4,000 (NT$16,000) | About HK$2,500 (NT$10,000) |
1.5 ct | From HK$6,500 (NT$26,000) | About HK$4,000 (NT$16,000) |
2.0 ct | From HK$9,000 (NT$36,000) | About HK$5,500 (NT$22,000) |
3.0 ct | From HK$17,000 (NT$68,000) | About HK$8,000 (NT$32,000) |
✦ Additional Notes:
GIA certification : Since the end of 2023, GIA has officially provided grading reports for lab grown diamonds (handled independently from natural diamond reports). GIA reports are more credible and accepted by the high-end market.
The IGI certificate is still the mainstream in the industry , but the certification threshold and stability have been subject to much discussion in recent years, and the price has also dropped significantly.
Although uncertified or factory-certified jewelry is cheaper, the quality varies greatly and is not recommended for engagement rings or important jewelry purposes.
Natural Diamond Price List 2025
Carat | Engagement Level GIA Certification (D / VS+ / EX) | Daily use grade GIA certified (E–F/SI/VG) |
0.5 ct | From HK$7,000 (NT$28,000) | From HK$5,500 (NT$22,000) |
0.7 ct | From HK$11,000 (NT$44,000) | From HK$8,700 (NT$34,800) |
1.0 ct | From HK$30,000 (NT$120,000) | From HK$18,000 (NT$72,000) |
1.5 ct | From HK$87,000 (NT$348,000) | From HK$43,000 (NT$172,000) |
The price difference between lab grown diamonds and natural diamonds and its interpretation
By 2025, the price of lab grown diamonds over 1 carat will be only 5% to 10% of the price of natural diamonds of the same grade . This price difference comes from the following factors:
The supply chains are inherently different : natural diamonds take hundreds of millions of years to form and are in limited supply; lab grown diamonds have controllable output and declining costs.
Brand positioning and secondary market : Natural diamonds have a record of maintaining their value in the luxury goods and auction markets; lab grown diamonds are currently still mainly positioned as "high-quality consumer goods."
Identical appearance and composition : Once laboratory technology is stabilized, lab grown diamonds are chemically, optically and structurally identical to natural diamonds , differing only in origin and rarity.
Buying Tips: Choosing the Lab Grown Diamond Price Range That's Right for You
If you are considering purchasing lab grown diamonds, you can make an initial screening based on the following criteria:
Limited budget/daily wear : IGI certified lab grown diamonds, products with extremely high CP value
Formal diamond ring or engagement ring : GIA lab grown diamonds, with quality assurance and value (GIA natural diamonds can be considered if the budget is high)
For collectors or those seeking rarity : Only GIA natural diamonds are the best choice
About RAGAZZA
RAGAZZA is a high-end diamond brand founded in Hong Kong, specializing in providing professional jewelry services for GIA lab grown diamonds and GIA natural diamonds . We adhere to the following commitments:
Only diamonds from international certification agencies are used
With stores in Hong Kong, Macau, Taipei and Kuala Lumpur
Transparent prices, support online diamond selection and physical trial
Provide personalized design and wedding ring consultation
FAQ
Q1: Why will the price of lab grown diamonds fall in 2025?
👉 Due to the increase in global supply, especially the large-scale CVD factories in China and India releasing a large number of medium and large carat diamonds, the overall market price will fall by about 20% to 30% compared with 2024.
Q2: Is there a big price difference between GIA and IGI lab grown diamonds?
👉 GIA lab grown diamonds are generally 30% to 50% more expensive than IGI or uncertified products because they have internationally authoritative certificates and strict grade evaluations, but they have obvious advantages in quality assurance and long-term value.
Q3: Are lab grown diamonds suitable for proposals or engagement?
👉 Absolutely. GIA or IGI certified lab grown diamonds are consistent with natural diamonds in chemical and optical properties. When paired with a professional custom-made ring, there is no difference in symbolic meaning or actual wearing.
Q4: Are lab grown diamonds suitable for long-term holding or investment?
👉 lab grown diamonds are mainly high-quality consumer jewelry. Although they have the same visual and chemical properties as natural diamonds, their value preservation in the international auction market and the secondary market is still limited. If you are looking for long-term value preservation or investment purposes, natural diamonds are still more valuable.
📩 If you would like to get one-on-one diamond advice based on your budget, or want to learn more about the styles, certificates and grade differences, please contact us . We provide professional diamond consulting services without sales pressure to help you make a safe choice.