人造鑽石 – Lab-Grown Diamonds

人造鑽石即 〈未來鑽石 2020.2.9〉
在實驗室中，鑽石的長成包含兩個過程：高溫高壓(High pressure-high temperature, HPHT)及化學氣體分解(Chemical vapor deposition, CVD)。(化學氣相沉積)

HPHT: 由一小粒鑽石種子(diamond seed)開始(猶如元宵的餡)，將鑽石種子放進碳中，並加溫至1500℃，加壓至1.5百萬psi。(一大氣壓為14.7 psi)
在此環境下，純碳將會融化並圍繞鑽石種子而開始形成鑽石(猶如元宵沾水一層一層滾上糯米粉)，最後經冷卻即成純碳鑽石。

CVD: 由以上HPHT所形成的鑽石，取一小片，放進密閉氣室中，並加熱至800℃。
將密閉氣室中充滿含碳氣體，如甲烷(Methane)等。含碳氣體經如微波或雷射等技術，離子化成電漿。離子化的過程，在破壞氣體的分子鍵，使得純碳附著在鑽石種子而慢慢結晶成鑽石(猶如元宵慢慢滾大)。

未來鑽石的成分及結構，在物理上、化學上、光學上和礦採的天然鑽石無異，只是來源不同。

未來鑽石的生產過程不會破壞地球樣貌與環境生態，而且更加環保，亦無剝削勞工和血鑽石的疑慮，更令人興奮的是其售價只要礦採天然鑽石的三分之一，是珠寶鑽石界的綠色革命，是未來鑽石的主流趨勢。

喜愛鑽石的人不少，最具代表性的莫過於英國梅根王妃的3克拉婚戒 – 是出自Diamond Foundry的未來鑽石。

喜愛鑽石嗎?鑽石真的高貴，鑽石真的優雅。

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Ｑ：為什麼未來鑽石的培育過程要經過兩個程序：HPHT和CVD? 由文中描述，不是在HPHT就已經培育出鑽石了嗎? 為什麼還需要CVD這個步驟? 答對者will be rewarded. 2025/11/4
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人造鑽石 – Lab-Grown Diamonds

A lab-created diamond is “grown” inside a lab using cutting-edge technology that replicated the natural diamond growing process.

There are two processes labs use to grow diamonds – High Pressure-High Temperature (HPHT) and Chemical Vapor Deposition (CVD).

An HPHT diamond begins as a small diamond seed that is placed into carbon. The seed is exposed to temperatures of about 1500 degrees Celsius and pressurized to approximately 1.5 million pounds per square inch.

The pure carbon melts and starts to form a diamond around the starter seed. It is then carefully cooled to form a pure carbon diamond.

A CVD diamond begins as a thin slice of diamond seed from HPHT produced diamonds. The diamond seed is placed in a sealed chamber and heated to around 800 degrees Celsius.

The chamber is filled with a carbon rich-gas, like Methane, and other gases. The gases are ionized into plasma using technology similar to that of microwaves or lasers. The ionization breaks the molecular bonds in the gases, and the pure carbon adheres to the diamond seed and slowly crystallizes.