What do you pay attention when you choose a diamond or a diamond jewelry? Usually these are external characteristics like cut, luster, size and color. But there is one more feature you should take into account – clarity.
The 4Cs of diamonds are the following: cut, color, clarity and carat weight. These are the criteria used by both diamond retailers and customers to pick up the right stone. While it can be all clear with the rest three, clarity is not that easy to define.
When we speak about this diamond characteristic, we imply that there are some flaws, better say inclusions within the stone, which determine a stone’s clarity. It’s not a secret that even though diamonds are very expensive, the majority of them do have blemishes, thus are not flawless at all. It wouldn’t be a problem but for the fact that inclusions decrease the gem’s brilliance. Brilliance on the other hand is what attracts a customer to buy this or that stone. Thus it becomes clear why jewelry manufacturers tend to enhance diamond clarity. The methods used to improve the clarity are as follows:
Laser drilling creates a minute hole in the diamond, allowing for black carbon spots to be cleaned out. This type of enhancement is permanent, which is both an advantage and disadvantage.
On the one hand, the tiny holes, although not visible to the naked eye, will always be in the diamond. On the other hand, the diamond will be clearer for good.
Fracture filling, despite its name, does not mean that the diamond is broken or cracked, rather that the original inclusions are coated with a clear substance to make them invisible to the naked eye.
Diamonds that are filled are cleaned and boiled to remove any dirt and other imperfections, and then they are filled with a microscopic amount of clear material that cloaks the feathers. There are two types of filling used for clarity enhancement.
One using bromide and the other using a silicone based material. The former is the lower quality treatment and can discolor or fade over time. The higher quality treatment can last a lifetime so long as it isn’t exposed to extreme heat (over 1500 degrees) or acid.
The information is taken from http://www.shireeodiz.com/education/diamonds-knowledge-center/clarity-enhanced-diamonds.html