Lectures from leading Gemmologists, Dealers, and Diamond Experts on a broad range of subjects but crucial topics that are most worrisome to Jewellers, Gem Dealers and Appraisers.
Invited Octonus Representative (Octonus, Finland)
Diamond Impression – The Key to Sustainable Competitiveness
People value diamonds’ miracle: brilliance, fire, etc., while trade commoditized the product offering 4 C’s, being technically unable to promote the key consumer values. Thus diamonds consistently loose competitiveness against luxury sector; other luxury goods consistently grow in addressing people’s self-expression desire. But from now on the coming technology allows demonstration and comparison of diamond magical performance in big-scale with fine details.
Modern knowledge rapidly creates the category of High-Vibrancy diamonds (Hi-Vi) – superbly impressive diamonds with a range of superior consumer benefits (brilliancy, fire, table color, symmetry, spread, etc.). Historically triple excellent round was the first Hi-Vi; it took centuries for the industry to craft it.
Hi-Vi diamonds to be promoted with a new optical performance digital “loupe”, when even inexperienced buyers can easily appreciate performance difference at the highest levels of brilliancy, fire and scintillation, which is critically important for the mass market of relatively small diamonds.
The new technologies allow consumers’ enjoy self-expression and the industry savor the sustainable market growth
John Chapman (Gemetrix, Australia)
The Economics of Faceting Diamonds
Diamonds are cut and polished from rough which varies in shape and size from near 2 mm to tens of carats. The stones are cut, shaped and polished using several methods that include lasers, grinding, and polishing wheels. The costs of each of these operations depends on the technology used and size of diamond. Depending on the country, these costs can be a major factor in the profitability of transforming a rough diamond into a facetted gem. Value adding can also be performed on existing facetted diamonds that are coloured, transforming them to a higher colour grade.
Garry Holloway (Holloway Diamonds, Australia)
Poorly Proportioned Diamonds Cheat Buyers
Most poorly proportioned diamonds appear smaller because of light leakage at the edges. Until now there has been no way to estimate the smaller (or larger) appearance of different diamonds when buying online. A new software system reveals the apparent size a diamond– the “Looks Like Size”. By inputting a diamond’s weight, dimensions and cut proportions, often from a GIA grading report, a result is given of a visual apparent carat size compared to a benchmark (6.44mm) well-cut round brilliant. Most diamonds look much smaller than indicated by their carat weight.
Stefan Miller (DSEF Lab, Germany)
Notes from the German Gem Lab DSEF (Idar-Oberstein)
A mix of gemmological topics are experienced by gem labs and this presentation will cover new gemstones from Africa (especially Ethiopia, Mozambique and Madagascar, the origin of Paraiba (Copper-Bearing) tourmalines, low temperature treatments of ruby from Mozambique, clarity enhancements of ruby, sapphire, tourmaline and tanzanite, reversible color modifications of zircon, and unusual imitations to cutting and carving of African gems
at Idar-Oberstein.
Dr. Clemens Schwarzinger (Clemens Schwarzinger Gemstones, Austria)
Gem Cutting in the 21st Century – Weight Retention or Precision Cuts?
In order to bring out the best in a rough stone it has to be cut and facetted. But what is a good cut and how does it influence the appearance of the gem? It sounds pretty simple: follow the laws of physics and create a pattern that reflects as much light as possible – if only all stones were of bright color and to be cut in rounds. In reality we have to deal with light and dark material, di- and trichroic stones, cleavage planes and of course all kinds of shapes in the rough that somehow dictate the shape of the final gem. However, there is a striking difference between trying to retain as much weight as possible and trying to cut the best looking gem. A journey will be taken through the dos and don’ts of gemstone designing.
Gamini Zoysa (Ceylon Gemmological Services, Sri Lanka)
Values of Rubies and Sapphires from Different Localities
Sri Lanka is one of the foremost countries which produce high quality sapphires. The colour of Sri Lankan blue sapphires vary from paler hues of Blue to vivid blue . Modern cutting and heat treatments at local facilities are common in last 20 years. The mines also produce many other varieties of sapphires namely Padparadsha, pink, orange, colorless, and purple. The asteriated varieties namely are unique and are popular among the collectors . The value of sapphires & Rubies depends on their origin and gemmological features from which will be discussed in detailed.