Lab-grown diamonds, just like natural diamonds, are among the hardest substances known to exist on Earth. As such, they do not age in the typical sense of the term. A diamond's crystal structure is incredibly stable, which gives diamonds their renowned hardness and durability. Consequently, both lab-grown and natural diamonds can theoretically last forever if properly cared for.
That being said, like any diamond, a lab-grown diamond can be subject to surface scratches and other physical damage if it is mishandled or exposed to harsh conditions. These external changes are not indicative of the diamond 'ageing', but rather the wear and tear that can occur over time due to improper care or accidents.
As for the appearance, a well-maintained diamond, whether natural or lab-grown, should not change in Colour or clarity over time. One notable exception could be certain types of lab-grown diamonds treated with high temperatures and pressures to alter their Colour; these might potentially revert to their original Colour over an extended period or under specific conditions, but this is not common.
Another important point is the setting in which the diamond is placed. Settings can wear down over time, and if not regularly maintained, could lead to the diamond becoming loose or even falling out.
In conclusion, lab-grown diamonds, similar to natural diamonds, do not 'age' in the traditional sense. With proper care and regular checks on the setting, a lab-grown diamond can remain as stunning and brilliant as the day it was created or purchased.
