The impurities in corundum gems produce the large range of colours found. Gems generally get their colour because of certain metals or impurities contained in the mineral. They have the same chemical composition and structure.
Sapphires and rubies are both gem varieties of the mineral corundum. Each of these 41 brilliant cut gems is about 3 mm in diameter. With an impressive total weight of 168.27 carats (containing 50.33, 32.80, 33.70, 23.98, and 27.46 ct sapphires), the bracelet is truly a breathtaking sight.Colour range of Australian sapphires.
The creative combination of faceting and design perfectly captures the sunlight, creating magnificent reflections for the admirer. Alexander opted for a traditional cut for the outer shape but faceted the back to allow for more cross-reflection, mimicking this faceting in the diamonds that appear on the side of the bracelet. (Her previously designed pieces included a pendant, brooch, ring, necklace, and earrings.) The family aimed to create a harmony between the gems and the materials used, concentrating on gold colors that would not overshadow the sapphires. Two successful trips in 20 yielded five exceptionally large rough stones from five different deposits in the area surrounding Ratnapura, Sri Lanka (figure 1).īack in Germany, Alexander cut the five rough stones, and Sonja designed an exquisite bracelet (figures 2 and 3) to complete a suite of jewelry for a private collector. Locating the sapphire rough in Sri Lanka required a combination of planning and luck, relying on the family’s previously established network while also acting on rumors of possible sources. As G&G has reported in previous Tucson reports from 2014, 2015, and 2017, father Stefan buys the rough, mother Sonja designs the jewelry, and Alexander cuts the gems for the family business (Kreis Jewellery GmbH, Niederworresbach, Germany). Photo courtesy of Kreis Jewellery GmbH.Ī return to the Tucson shows meant the opportunity to see the latest findings and designs from the Kreis family-stunning yellow sapphire from Sri Lanka.
This 160 ct yellow sapphire rough was found in a deposit outside of Ratnapura, Sri Lanka. Comprehensive CAD/CAM For Jewelry Certificateįigure 1.
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