3 Carat Marquise Cut 18k Yellow Gold Lab Diamond Ring+ 3.0-Carat Marquise Lab Created Diamond

Lab diamonds are grown using two methods: HPHT (High Pressure High Temperature), which replicates the conditions deep in the earth, and CVD (Chemical Vapor Deposition), which builds the diamond carbon layer by layer from a gas. Both produce diamonds that are physically and chemically identical to mined stones.

Yes. The color difference is visible, especially side by side. 18k yellow gold has a more vibrant, deeply golden hue. 14k appears slightly paler because of its lower gold content. If the warmth and richness of the gold color is important to you aesthetically, 18k delivers it clearly.

A 3 carat stone is well above average and a great choice for someone who wants their ring to look expensive and elevated without crossing into the ostentatious territory you hit at 4-5 carats. A comparable lab-grown 3 carat stone can be found for $3,000 to $8,000 depending on quality grades. The price difference at this size is extraordinary, which is one of the most compelling reasons couples choose lab diamonds for larger center stones.

Yes, marquise cuts are prone to the bow-tie effect, a dark shadow across the center of the stone where light is not returned efficiently. A faint bow-tie is common and acceptable. A strong, dark bow-tie is undesirable. Cut quality and proportions determine how pronounced the bow-tie is, making it important to evaluate the specific stone rather than just relying on specs.

The 3ct marquise lab diamond in 18k yellow gold from Do Amore is a truly regal piece. The deeper saturated hue of 18k yellow gold (75% pure) provides a rich backdrop for the marquise cut's dramatic elongated form, and at 3 carats the brilliant-cut facets produce a commanding display. Every lab diamond is conflict-free with the same properties as a mined stone. Do Amore was the only engagement ring company on Shark Tank and has earned Forbes recognition.