Gemstone & Jewellery Certification

Lab-grown diamonds are certified and graded using the same rigorous standards applied to natural diamonds. Leading gemological laboratories in the lab-grown sector, like IGI (International Gemological Institute), issue grading reports that assess the diamond based on its carat, colour, clarity, and cut to ensure consistency and transparency. 

Each grading report clearly states that the diamond is laboratory-grown and also identifies the method of formation, whether it was created using High Pressure High Temperature (HPHT) or Chemical Vapour Deposition (CVD). The report will also disclose if any post-growth treatments have been applied to the diamond, or note if a treatment status could not be determined.

IGI laser-inscribes each lab-grown diamond with “LABGROWN” to help distinguish it from natural stones. In terms of documentation, IGI offers both digital and printed grading reports. These confirm the diamond’s quality, specifications, and lab-grown origin — giving you full confidence in your stone’s authenticity and characteristics.

Both coloured and colourless lab-grown diamonds are graded by respected gemological institutes such as IGI, with reports that detail the diamond’s carat weight, clarity, and cut.

The main difference lies in how colour is assessed. Instead of the traditional D–Z scale used for colourless diamonds, coloured diamonds are evaluated based on the tone and saturation of their hue — such as pink, blue, or yellow. This ensures a consistent, transparent standard for grading the unique beauty of each coloured stone.

Every coloured lab diamond at Keanis comes with an IGI grading report, offering you confidence in its quality, character, and craftsmanship.

Lab-grown diamonds are typically laser-inscribed with their IGI report number along the girdle for traceability and assurance. However, coloured gemstones — such as emeralds, sapphires, and rubies — are rarely inscribed, as the process is more delicate and not commonly applied.

If you'd like to confirm the stone, it's common practice to cross-check that the stone's specifications match the details listed on the certificate.

At the moment, we only offer IGI-certified lab-grown diamonds. This ensures you receive full transparency through the traditional 4Cs grading system — carat, colour, clarity, and cut.

GIA recently announced that it will be phasing out 4Cs grading for lab-grown diamonds by the end of 2025. Instead, lab-grown diamonds will be categorised more broadly as “Premium,” “Standard,” or left ungraded. As this new system offers less detail, we’ve chosen to continue working with IGI for now, so you can make fully informed decisions when selecting your stone.