A lab grown diamond is chemically, physically, and optically identical to a mined diamond — the same crystal structure, the same hardness, the same fire — grown in a controlled lab environment in weeks rather than formed underground over billions of years. For couples choosing an engagement ring, that means every characteristic a jeweler or gemologist tests for is the same; the difference is origin, not composition.
How Lab Grown Diamonds Compare to Mined Diamonds
Because a lab grown diamond and a mined diamond are graded on the same 4Cs (cut, color, clarity, carat), a certified lab grown stone carries the same specifications a jeweler would look for in a mined one. The primary practical difference for buyers is cost: lab grown diamonds typically run 30–50% less than a mined diamond of comparable size and grade, which allows for a larger center stone or a more detailed setting within the same budget.
Certification: What IGI Grading Confirms
Every lab grown diamond in the Kosei Moissanites collection is certified by IGI, an independent gemological lab that verifies carat weight, cut grade, color, and clarity, and confirms lab-grown origin on the certificate itself. This certification is what allows a buyer to compare a lab grown diamond ring against another retailer’s stone on equal terms.
Choosing a Shape and Setting
- Round brilliant — the highest light performance of any shape, the most classic choice for engagement rings.
- Oval and pear — elongating shapes that read larger per carat.
- Cushion and princess — softer or sharper geometric silhouettes for a more structured look. Emerald and asscher — step-cut facets that show a "hall of mirrors" effect rather than brilliant sparkle.
Setting choice affects both durability and how large the stone appears: a halo setting increases perceived size, a solitaire keeps focus on the stone itself, and a hidden halo adds brilliance without changing the ring’s visible silhouette.
Sustainability and Sourcing
Because lab grown diamonds don't require mining, they carry a smaller environmental footprint and remove any question of conflict sourcing — a factor an increasing number of couples weigh alongside price and appearance when comparing lab grown diamonds to mined stones or to moissanite.
What's Included With Every Ring
Lab grown diamond engagement rings are available in 925 sterling silver, 10kt/14kt/18kt gold, or platinum, with free worldwide shipping, an 18–20 day production and delivery window, and a 30-day return policy.
Browse the full lab grown diamond collection by shape, carat weight, and setting, or start a custom design with our team.
