What is the difference between cvd and hpht in lab-grown diamonds ?

lab-grown diamonds can be produced in two ways: cvd (chemical vapor deposition) or hpht (high pressure high temperature) . While both techniques produce real diamonds, there are clear differences in process, quality, and application . In this blog post, we'll explain them clearly .

what is cvd ?

cvd stands for chemical vapor deposition . This method creates a diamond from a gas cloud heated in a vacuum chamber . Carbon particles slowly deposit on a thin diamond seed, growing a new diamond layer by layer .

• more energy efficient than hpht
• more control over growth
• less chance of metal inclusions

what is hpht ?

hpht stands for high pressure high temperature . This process mimics the conditions inside the earth: high pressure and temperature cause graphite to transform into diamond .

• faster growth process
• often lower costs per carat
• used for large or industrial stones

what is better: cvd or hpht ?

that depends on what you're looking for . Cvd diamonds are often chosen for jewelry because they have high optical purity and few impurities . Hpht diamonds are often slightly harder and are also used for industrial applications .

at louèn diamonds, we use top-quality cvd stones for all stones over 0 . 75 ct . Why ? Because they undergo an even more stable process, are beautifully white, and sparkle as you'd expect .

want to know why we value quality so much ? also read: how we guarantee quality .

how do you know what you're buying ?

every diamond you buy at louèn comes with an igi certificate . So you know exactly what you're wearing .

both cvd and hpht produce real diamonds . What matters is transparency and quality .