CVD diamonds — short for Chemical Vapor Deposition — are one of the two main types of lab-grown diamonds on the market today (the other being HPHT, High Pressure High Temperature). CVD is the newer of the two methods and now dominates production of high-clarity, high-color gem-grade lab-grown diamonds. This guide explains how CVD diamonds are made, how they compare to mined and HPHT diamonds, and what to look for when buying one.
CVD (Chemical Vapor Deposition) is one of two methods for producing lab-grown diamonds — the other being HPHT. CVD grows diamonds atom-by-atom from carbon-rich plasma over 2-4 weeks per 1-carat stone. The result is chemically and optically identical to mined diamond, graded the same way by GIA/IGI, and priced 60-70% lower. Most D-IF and high-clarity lab-grown diamonds on the market are CVD; HPHT is more common in fancy yellows.
How CVD diamonds are made
CVD growth starts with a small diamond seed — a thin slice of either lab-grown or mined diamond, typically 3–5 millimeters across. The seed is placed in a sealed reactor chamber and the chamber is filled with a carbon-rich gas mixture, usually methane and hydrogen. The gas is energized with microwaves until it forms a plasma, breaking the methane molecules apart. The freed carbon atoms then deposit onto the seed crystal layer by layer, building a new diamond on top of the seed at roughly 0.1 millimeters per hour. A 1-carat round brilliant takes about 2–4 weeks to grow.
CVD vs HPHT diamonds
HPHT (High Pressure High Temperature) recreates the geological conditions of the earth's mantle — pressure of around 60,000 atmospheres at 1,500°C — forcing carbon to crystallize into diamond around a seed in days. HPHT diamonds tend to have slightly more inclusions and often have a yellowish or brownish cast that requires post-growth treatment. CVD diamonds grow at much lower pressure, producing fewer inclusions and a more consistent color profile. Most D-IF and D-VVS quality lab-grown diamonds sold today are CVD; HPHT is more common in lower-color grades and fancy yellows.
Are CVD diamonds real diamonds
Yes. CVD diamonds are chemically identical to mined diamonds — pure crystallized carbon in the same cubic crystal structure. They have the same hardness (10 on the Mohs scale), the same refractive index (2.42), and the same dispersion that produces "fire." The US Federal Trade Commission, the GIA, and the IGI all formally classify CVD diamonds as diamonds, not as simulants. The only distinction at the certificate level is the origin label and a notation that the diamond was laboratory-grown.
How to identify a CVD diamond
You cannot identify a CVD diamond by eye — even an experienced jeweler cannot reliably tell a CVD diamond apart from a mined one without specialist equipment. Identification requires spectroscopy that detects the trace nitrogen levels and growth-pattern signatures unique to CVD formation. The GIA and IGI lab reports include this analysis and explicitly state "CVD synthetic" or "Laboratory-Grown (CVD)" on the certificate. Every CVD diamond from a reputable retailer is laser-inscribed on the girdle with its lab report number so you can match certificate to stone.
CVD diamond pricing
CVD diamonds typically cost 60–70% less than mined diamonds of equivalent grade. A 1-carat round brilliant in F color, VS1 clarity might cost $4,500–$6,000 mined versus $1,500–$2,200 CVD. The price gap widens at larger carat weights — a 2-carat CVD might be $4,000 versus $20,000+ mined. Within lab-grown, CVD and HPHT prices are roughly equivalent at the same color and clarity grades; CVD tends to dominate the higher-color, higher-clarity end of the market where its growth process advantages show.
Frequently Asked Questions
Are CVD diamonds as durable as mined diamonds?
Yes — they are the same material. Diamond is the hardest natural mineral known (10 on the Mohs scale), and CVD diamonds have the same crystal structure that produces this hardness. A CVD diamond will not scratch, chip, or dull faster than a mined diamond. With normal wear and routine cleaning, a CVD diamond will last for generations without losing its sparkle or structural integrity.
Will a CVD diamond hold its value?
Resale value for any diamond — CVD, HPHT, or mined — typically sits at 30–50% of the original retail purchase price. Neither lab-grown nor mass-market mined diamonds should be considered investments. The value of a CVD diamond is what you get at the moment of purchase: a substantially larger or higher-quality stone for the same budget compared with mined.
Can a CVD diamond be set in any style of ring?
Yes. CVD diamonds can be set in any setting style that accepts a diamond of the same size — solitaire, halo, three-stone, bezel, channel, pavé. Jewelers handle them with the same techniques used for mined stones. CVD diamonds also work well in eternity bands, tennis bracelets, and pendants where the value math is especially favorable because of the per-carat savings.
Do CVD diamonds come with the same warranty and aftercare as mined diamonds?
At Reve Diamonds, yes — same lifetime warranty, same free resizing, same free cleaning service. Other reputable jewelers offer equivalent terms. Independent jewelry insurers (Jewelers Mutual, BriteCo) cover CVD diamonds on the same terms as mined diamonds. The buying and ownership experience is identical.
How is a CVD diamond different from a Cubic Zirconia or Moissanite?
Hugely different — CVD diamond is a real diamond (pure crystallized carbon, hardness 10). Cubic Zirconia is a different material (zirconium dioxide, hardness 8) that visually mimics diamond but has different optical properties and softer hardness. Moissanite (silicon carbide, hardness 9.25) is another diamond simulant with stronger fire than diamond but lower hardness. CVD and HPHT are the only laboratory-produced stones that are gemologically classified as diamonds.
Choosing a CVD diamond at Reve
Reve Diamonds stocks CVD and HPHT lab-grown diamonds alongside mined diamonds across every shape, size, color, and clarity grade. Browse our engagement rings collection or visit our showroom to compare CVD and mined diamonds in person.
