What is a lab-grown diamond?

A lab-grown diamond is a diamond created in a controlled laboratory environment. It has essentially the same chemical composition, crystal structure, and physical and optical properties as a natural diamond. The main difference is its origin: one grows in a laboratory, while the other forms naturally within the Earth. Learn more from the Gemological Institute of America (GIA).

How are lab-grown diamonds made?

Two common processes are HPHT, which uses high pressure and high temperature, and CVD, or chemical vapor deposition. Both methods create diamond crystals that can be cut and polished for jewelry. A lab-grown diamond is different from a diamond simulant, such as cubic zirconia or moissanite, which is another material chosen to resemble a diamond.

Lab-grown and natural diamonds: what should you compare?

Both can be assessed by the familiar 4Cs: cut, color, clarity, and carat weight. These characteristics describe a diamond’s appearance and size. The 4Cs do not tell you whether a diamond is lab-grown or natural, so check the product details and documentation for its origin as well.

What to look for when buying

• Confirm that the listing clearly identifies the stone as lab-grown.
• Review the cut, color, clarity, and carat details for the specific diamond.
• Ask what grading report or documentation is provided and which organization issued it.
• Check the metal, ring or necklace details, return policy, and care instructions.

How to care for lab-grown diamond jewelry

Care for the setting as well as the diamond. Wipe your jewelry with a soft cloth after wearing it, and follow the care guidance for its metal and any additional gemstones. Have a jeweler check the setting if a stone feels loose or catches on clothing.