Treatments That Can Change Diamond Colours

8179-8181 copyWhen you purchase a white diamond ring, one of the factors that affects its value is its colour. The whiter the diamond, or the more colourless it is, the greater its value will be. The whitest diamonds allow a greater amount of light to pass through for a better sparkle and shine. These diamonds are rare, unlike diamonds with brownish or yellowish tones.

 

Fancy coloured diamonds are also extremely rare and expensive, but are not colourless. Instead, these diamonds are at the other end of the spectrum. Their value actually increases with their colour, which can range from bright yellow to blue to green.

 

The diamonds for your engagement rings are rated on an alphabetical scale, with D being the highest rating a white diamond can receive. The most expensive white diamonds are generally rated D, E, or F, while those with traces of brown or yellow in them are rated farther down the alphabetical scale, all the way to Z.

 

Because colourless diamonds are much more valuable, the jewellery industry has created a few methods for turning those lower scale diamonds into ones that are slightly more fancy. While some of these methods have been around for quite some time, others have only recently been developed.

 

Diamond Treatments

 

Colour Tricks and Coatings

 

Sometimes, the diamonds in your engagement rings may be covered with a coating that makes it difficult to see yellow traces in the diamond. This coating is applied with heat, but will eventually wear off over time.

 

Coloured dots of blue or purple ink can be painted onto diamonds to reduce the amount of yellow you are able to see. These dots are generally placed in areas that are obscured by the engagement ring setting, and are not permanent; they can generally be removed with cleaning solutions and water.

 

These diamond treatments are often not revealed to buyers before they make a purchase and are often used to deceive them.

 

Irradiation and High Heat

 

Sometimes jewellers turn ho-hum diamonds into fancy coloured diamonds through the use of irradiation, or exposing the diamond to radiation, and high heat. Most often, if the diamond isn’t exposed to high heat again during its life, the diamond will remain the fancy colour.

 

This trick generally isn’t used to deceive customers, but instead to allow those who can’t afford the price tag on fancy coloured engagement rings in NZ the opportunity to have a beautiful coloured diamond. However, those who purchase this kind of diamond need to understand that it is not a natural fancy coloured diamond and is not an investment.

 

High Pressure High Temperature (HPHT)

 

This controversial way of changing the colour of the diamonds in your engagement rings in NZ isn’t new, but the way the process is being used is. When this technique, which is similar to irradiation and high temperature treatments was first used to turn diamonds with yellow traces into fancy coloured ones, it is now capable of turning browning diamonds into colourless and expensive diamonds.

 

Steps are continually being taken to ensure that every buyer of engagement rings receives full disclosure about their diamonds and is not tricked into purchasing a diamond that has been artificially altered. The diamonds that are altered now must be laser inscribed with “irradiated” or “HPHT processed” or the name of a registered user in order to actually be graded.

 

 

While you may have thought a diamond was simply a diamond, when you purchase an engagement ring in NZ, you need to understand that some diamonds are altered to increase their value. Make sure you obtain full disclosure on your diamond ring so you can be sure you are buying the right one.

Comments are disabled