01/04/2026
đ âA Diamond is Foreverâ⌠But That Doesnât Mean Itâs Unbreakable đ
âA Diamond is Foreverâ is one of the most famous advertising slogans in the world, and it reflects the timeless beauty and durability of diamonds.
However, hardness and indestructibility are not the same thing.
In gemology, a diamondâs durability is made up of hardness, toughness and stability. While diamonds are excellent at resisting scratches, they are not immune to damage.
Diamonds have what are known as cleavage directions within their crystal structure. These are natural planes where the atomic bonds are weaker. Diamond cutters actually use these cleavage directions when shaping a rough diamond, carefully splitting the crystal along these planes to create the desired shape.
Because of this natural structure, a diamond can chip or even break if it receives a sharp blow in the right direction. This can occasionally happen during the jewellery setting process or even during everyday wear if the stone is struck hard enough.
Temperature can also affect a diamond. Diamonds are very stable and resistant to most chemicals, but extreme heat can cause damage. At around 850°C, diamonds can experience thermal shock, which may cause fractures or leave the stone looking white or cloudy in appearance. This type of damage can occur in extreme situations such as house fires.
In cases where heat damage causes cloudiness or fractures, a diamond can sometimes be recut by a skilled diamond cutter. Recutting removes the damaged area, restoring the diamondâs appearance, although the stone will usually become smaller in size.
Diamonds are still one of the most durable gemstones for everyday jewellery, which is why they are so popular for engagement rings. But like all precious stones, they still benefit from care, protection, and regular jewellery checks to keep them looking their best for generations. đ
For further reading
https://www.gia.edu/diamond-care-cleaning
