I guess that&#x27;s what they&#x27;re saying. Contrast with:<p>From <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Synthetic_diamond" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Synthetic_diamond</a><p>Synthetic diamond is also widely known as HPHT diamond or CVD diamond after the two common production methods (referring to the high-pressure high-temperature and chemical vapor deposition crystal formation methods, respectively)<p>And from <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Synthetic_diamond#Chemical_vapor_deposition" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Synthetic_diamond#Chemical_vap...</a><p>Unlike HPHT, CVD process does not require high pressures, as the growth typically occurs at pressures under 27 kPa.<p>[...]<p>and optimizing the substrate temperature (about 800 °C)