A deeper Dive into the different Machines
Though both CVD and HPHT diamonds boast the same brilliance and durability as their natural counterparts, subtle variations exist:
Chemical Vapour Deposition (CVD): Typically takes around a month for a 1-carat diamond.
High-Pressure High-Temperature (HPHT): Usually takes 2-3 weeks for a 1-carat diamond.
The difference in the results between the two techniques are small, but important.
Color:
HPHT: Often shines with exceptional color grades (D-F, nearly colorless), making it ideal for those seeking pristine white diamonds.
CVD: While still achieving high color grades, it might have a slight tendency towards faint brownish or grayish hues.
Clarity:
CVD: Frequently boasts exceptional clarity grades (FL, VVS1) due to fewer internal inclusions, resulting in flawless beauty.
HPHT: May contain more minor inclusions due to the intense pressure involved, though these are often microscopic and invisible to the naked eye.
Growth Pattern:
HPHT: Forms diamonds resembling a cub-octahedron, a unique 14-sided shape.
CVD: Typically grows cube-like diamonds, offering a distinct geometric charm.
Cost:
CVD: Currently, it might be slightly more expensive for comparable quality due to its newer technology and potential for exceptional clarity.
HPHT: Generally more cost-effective for smaller diamonds and certain color ranges, making it a budget-conscious choice.
Environmental Impact:
CVD: Considered more environmentally friendly due to lower energy consumption and a smaller carbon footprint compared to HPHT’s demanding pressure and temperature requirements.
Choosing Your Diamond:
The perfect lab-grown diamond awaits! When making your choice, consider:
Color preference: If a diamond white as snow is your dream, HPHT could be a touch better.
Clarity preference: For an internally flawless gem, CVD might be your champion.
Budget: HPHT shines for smaller diamonds or specific color grades, while CVD offers exceptional clarity at a premium.
Environmental consciousness: For a greener choice, CVD stands out.