What is a lab grown diamond?

Lab grown diamonds are chemically, physically, and optically identical to natural diamonds mined from the earth. The only difference is the origin. A lab grown diamond, as the name suggests, is grown in a laboratory using state-of-the-art technology that replicates the natural diamond growing process.

Similar to natural diamond growth, a lab grown diamond variates in colour and clarity. They are graded on the exact same criteria as natural diamonds by independent gemological laboratories that grade earth-extracted diamonds. Unlike simulants such as cubic zirconia and moissanite, lab grown diamonds have the same brilliance, fire and scintillation as natural diamonds. They offer the same sparkle that’s perfect as an engagement ring.

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How are lab diamonds grown?

By replicating the heat and pressure conditions found on earth in which carbon crystallises into diamond. This allows new carbon crystals to build upon the diamond seed, creating a larger diamond.

High Pressure High Temperature (HPHT)

A HPHT diamond begins its journey as a small diamond seed that is placed into carbon, where it is exposed to temperatures of about 1500°C and pressurised to 70,000 times the pressure at sea level.

At this extremely high pressure and high temperature, the pure carbon melts and begins to form a diamond around the starter seed. Thereafter, it is cooled into the strongest form of carbon; a diamond crystal.

Chemical Vapour Deposition (CVD)

A CVD grows within vacuum plasma reactors. The diamond seed is placed in a sealed chamber and hydrocarbon gas is injected into the reactor. Heated to approximately 800°C, the gases are ionised into plasma. High power microwaves breaks the molecular bonds in the gases, and the pure carbon precipitate onto the diamond plates, and gradually crystallises.


Lab grown diamonds are graded and certified using the same process as natural diamonds. Diamonds are sent to a gemological laboratory that specialises in grading diamonds, where the 4 C’s – Cut, Carat, Clarity and Colour, are used to assess the diamonds.

All Star Carat Shop diamonds are accompanied with a certification, a testament to its quality.  

Learn about 4C’s


Less expensive than natural diamonds.

When it comes to cutting, polishing and inspection, both natural and lab grown diamonds have the same costs. Up to this point, the cost and processes vary significantly between the two.

Natural diamonds have a lengthier supply chain which requires the laborious process of having them mined, while lab grown diamonds forgo the mining process, requiring less labour, making them lesser in costs.

Environmentally Friendlier Lab grown diamonds are less detrimental to the environment as it takes lesser energy to grow a diamond in a laboratory as compared to the diamonds being mined and unearthed from the ground.

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Whether it is a lab grown or natural diamond, both are beautiful diamonds. While some may contest that one is better, more valuable or holds more emotional values than the other, these two diamonds of different origins can’t be compared.

Diamonds hold a certain significance; it represents your story, your milestone or that special moment. The true significance of the diamond doesn’t lie in the origin, neither can it be measured by its price or grading. It all boils down to what is important to you, especially if you’re picking out diamonds for an important occasion such as an engagement ring. The diamond you choose is the endearment it represents.

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Being in the jewellery business for over 30 years, our belief has always been celebrating our customers’ best and special moments in life with beautiful diamonds and jewellery of unrivalled quality. With this in mind, Star Carat Shop has established strong partnerships with some of the most technologically advanced diamond growers, to offer you a selection of exceptional one-carat lab grown diamonds that are affordably priced.

Available in Singapore, we believe that our carefully hand-picked lab grown diamonds offer you a choice, to choose the best diamond for you that you can be assured of its quality and value.

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