Given the rarity and value of diamonds, it’s not surprising that experimenters have long sought to replicate a natural diamond or treat it to increase its value. Because synthetics, simulants, and treatments are becoming more advanced and harder to detect, a GIA Diamond Grading Report is essential to know what you’re really buying. There is nothing inherently unethical about treating a diamond, but U.S. law requires full disclosure. GIA’s research efforts have been critical in identifying each of the diamond treatment techniques described here and is committed to helping the gem-buying public know exactly what they’re buying.GIA wants you to understand exactly what you’re buying when shopping for your diamond. As creators of the 4Cs and the International Diamond Grading System™, GIA set the standards for diamond grading and has been helping consumers make educated diamond buying decisions for over 50 years.
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Recently, a pink coloured diamond weighing 0.70ct was submitted to DCLA laboratory for certification and colour authentication. The colour was described as 3 PP on a diamond report issued by another Australian-based laboratory.
After routine examination however, DCLA discovered that when the diamond is viewed under high magnification with reflected diffused light, a patchy iridescent coating is visible on the surface. This coating is also easily visible on the pavilion facets of the diamond when viewed through the table. However, when the diamond is observed under magnification with regular diffused light, the pink coloration appears evenly distributed, particularly when viewed face up.
The pink colour is the result of a coating rather than from natural lattice defects in natural pink diamonds. Surface coating is the process of adding a thin layer of coloured foreign material to all or part of a gemstone's surface, with the intent of either masking the underlying body colour or enhancing a desirable colour. Most often, this coating is applied to the pavilion and/or girdle of the diamond; the way that light refracts as it passes through a diamond creates the illusion of uniform colour distribution.
The durability of diamond coatings vary considerably, depending on materials used and methods of coating applied. Most recent advances in technology employ a very thin optical or chemical film which is more durable than older methods, but still readily worn away by heat, scratching, abrasion, polishing, and just everyday wear.
Coating is a deceptive practice; we do not know the number of coated pink diamonds which have entered the marketplace, but the DCLA has seen a number of treated stones of late. Of particular concern is when such treated diamonds are accompanied by seemingly legitimate reports or paperwork.
DCLA screens every diamond submitted to the laboratory for all known treatments, and will not issue a diamond certificate for treated or synthetic diamonds.
Growing Incidence of Undisclosed Treated Diamonds in Australia
DCLA has seen an alarming increase in the number of treated diamonds being submitted as natural diamonds to the laboratory for certification.
It should first be said that diamond treatments are neither good, nor intrinsically bad in and of themselves. There is nothing wrong with buying a treated diamond, provided that the treatment is fully disclosed and that you pay the appropriate price for the diamond. Because of their lower cost and value, treated diamonds can allow a person to buy a diamond that appears to be of a higher quality than it truly is.
However, too often the presence of such diamond treatments is concealed. Whether this deception is by intent or negligence, such concealment is tantamount to fraud.
Not only does artificially treating a diamond significantly reduce its value, but most diamond treatments are unstable and reversible. For this reason, all internationally accepted rules for diamond grading forbid the certification of treated diamonds. An extremely disturbing discovery just recently in the DCLA Laboratory was that of a coated diamond accompanied by a certificate from a supposedly legitimate Australian ‘laboratory’.
Members of the diamond industry have a responsibility to consumers to convey accurate and transparent information, and each individual that handles a diamond as it moves down the diamond pipeline from the mines should be held accountable for making known any treatments that a diamond has undergone.
It is deceptive and unfair to fail to disclose treatment of a diamond when it has a significant effect on a diamond’s value. In its pursuit of consumer protection, DCLA is offering a ‘Diamond Amnesty’ for diamond owners Australia-wide – any diamond brought in with its matching diamond grading certificate will be verified for grading accuracy and tested to ensure that it is natural and free of treatments. This service will be provided free of charge.
Hi,
it was a good post on "DIAMOND BUYING GUIDE AND GIA GRADING REPORTS".
Due to the increasing demand for diamond alternatives, more and more manufacturers are now involved in the business. Despite the technological advancements, the diamond’s brilliance, luster, sparkle and beauty remains unmatched. Hybrid Diamonds are also fashionable these days because of their beauty and brilliance.
It was really good to know about how to buy diamonds. The post you have shared is really informative. Diamond is really precious.
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