The most important perquisites for achieving maximum precision in diamond grading include:
→ Precise and standardized terminology and descriptive norms.
→ A well-graduated colour comparison set.
→ A series of proven practical techniques as well as knowledge in the use of equipment and technical aids.
→ Includes thorough cleaning of the stone before work starts, so that you can determine with certainty whether you have dust on the surface or interior inclusions.
→ A great deal of practical experience. Training must be underpinned with experience and knowledge.
→ Good eyesight is the most important and most valuable grading instrument required to observe the most minute characteristics, using either loupe or microscope magnification, to distinguish the slightest colour nuances.
→ Patience is another very important personal trait that makes a good grader!
Especially at the begging, grading even one brilliant can easily last up to one hour.
In a gemmological laboratory with experienced professional graders who grade diamonds on daily basis, 20 stones every day means around 20 minutes per stone, which is a good work quota.
DIAMOND GRADING ALSO MEANS:
→ A sense of responsibility
Today at the world’s leading diamond laboratories, several graders acting independently of one another working on the anonymity principle and having no knowledge of the client, are always used to perform colour, clarity and cut grading. The certificate is only issued after several experienced graders have come to the same conclusion.
In addition, internal tests, so-called “series tests”, are conducted on a regular basis.
These tests are performed on a series of test diamonds, which are handled in the same way as stones for other clients and which are subjected to exactly the same evaluation procedure. The graders of course do not know that the stones are being evaluated for test purpose.
These “series tests”, which are always performed on the same series of diamonds, are performed regularly. The objective is to check whether over a period of several years graders arrive at a different rating of the same diamond due, for example, to impaired eyesight or declining powers of concentration.
In other words, a diamond that has already been graded should be given the same quality rating when it is graded, again by the same individual.
Heileig diamonds sells diamonds which are graded by world’s renowned laboratories such as GIA, IDI, IGI and HKD.
Heileig diamonds caters direct customers and jewellers across Australia in diamond and gold jewellery, certified solitaire, melee, stars and pointers.