Lab-Grown Diamond Jewelry & Wedding Rings

Yes. Lab-grown diamonds are not simulants or imitations. They are composed of pure carbon in the same crystal structure as mined diamonds, and share identical hardness, refractive index, and optical properties.

Lab-grown diamonds are certified by both GIA and IGI under the same grading standards applied to natural stones. The certificate issued for a lab-grown diamond is identical in format and detail to one issued for a mined stone.

A diamond simulant is a stone that resembles a diamond but has different chemical and physical properties. Common simulants include cubic zirconia and moissanite.

A lab-grown diamond is not a simulant. It is composed of pure carbon in the same crystal structure as a mined diamond, with identical hardness, refractive index, and optical performance. The distinction matters because simulants will behave differently under wear over time, while a lab-grown diamond is as durable and stable as any natural diamond.

At LeCaine Gems, lab-grown diamond rings start from approximately SGD 1,638 all-in, comprising a stone from SGD 1,238 and a plain 18K white gold solitaire setting from SGD 400. Pricing varies with the choice of shape, grade, carat weight, and setting style. Fancy shapes such as oval and pear are often priced below rounds of equivalent carat weight, which can be a useful way to get more visual size within the same budget.

CVD (Chemical Vapor Deposition) and HPHT (High Pressure High Temperature) are the two main processes used to grow lab diamonds. CVD grows the diamond from a carbon-rich gas in a chamber, while HPHT replicates the pressure and temperature conditions found deep within the earth. Both produce diamonds of equivalent quality, and neither process is inherently superior to the other. The grading and certification process is identical for both.

For round brilliants, Excellent is the recommended minimum. Within that grade, there is meaningful variation, and a Hearts and Arrows verified stone is cut to tighter tolerances than a standard Excellent, producing more directional and consistent light return.

For fancy shapes such as oval or pear, GIA and IGI do not issue a formal cut grade, so the assessment focuses on the length-to-width ratio, depth percentage, and the presence of any optical effects, such as the bow-tie effect that can appear in some ovals. This is best assessed in person at the showroom.

No. Lab diamonds do not yellow, cloud, or deteriorate with age. They maintain their brilliance and structural integrity indefinitely. Routine cleaning with warm water, mild soap, and a soft brush is all that is needed to keep the stone looking its best.

Round brilliant, oval, pear, emerald, asscher, princess, cushion, marquise, and radiant cuts are all available. Each shape carries different visual characteristics at the same carat weight. Oval and marquise cuts, for instance, face up larger than rounds of equivalent weight, which can make a meaningful difference to the overall presence of the ring.

For most buyers, yes. A lab-grown diamond is equally durable and brilliant, and the significant price difference compared to mined stones of the same grade means the budget can go further on carat weight, cut quality, or setting. The fully traceable, conflict-free origin is also an important consideration for many couples. The main area to think through carefully is resale value, as the secondary market for lab-grown diamonds is more limited than for natural stones.

Lab-grown diamonds and moissanite are both popular alternatives to mined diamonds, but they are different stones with different properties.

Moissanite is silicon carbide, not carbon, and has a higher refractive index than diamond, which produces a more colorful fire that some buyers prefer and others find less desirable. A lab-grown diamond, by comparison, behaves optically in exactly the same way as a mined stone. Moissanite is generally less expensive than lab-grown diamonds at equivalent sizes. Both are durable choices for everyday wear.

Yes. Lab-grown diamonds can be set in any metal available for mined diamonds, including 18K yellow gold, 18K white gold, 18K rose gold, and platinum. The choice of metal affects the overall aesthetic and the long-term maintenance of the setting. Platinum is the most durable and suits buyers who prefer a low-maintenance option. 18K white gold achieves a similar look at a lower price point and can be re-rhodium plated over time to maintain its color.