BYL Rewards 210 x 297 mm 3mm bleed.pdf 1 2017/08/28 5:38 PM © COPYRIGHT JEWELLERS’ NETWORK C M Y CM MY CYCMY K 50 / JEWEL TRADER / SEPTEMBER 2017
FEATURED ARTICLE EMERALD AND OTHER VARIETIES OF BERYL The occurrence of emerald The fact is that chromium precipitates early on in igneous activity and the element is therefore is relatively rare because this most abundant in mafic and ultramafic rocks. mineral is only formed under very specific and unusual geological Beryl on the other hand is a late-stage mineral conditions. that is generally to be found in or closely associated with pegmatites and hydrothermal Like aquamarine (sea blue-green), heliodor deposits. The majority of emerald deposits (golden), morganite (pink) and red beryl, are therefore to be found in the contact emerald is a member of the beryl family. Beryl, metamorphic schists created when pegmatite Be3AL2Si6O18 is an allochromatic mineral this dykes penetrate earlier chrome rich host rocks. means that it is colourless in its purest form Schistose emeralds generally occur where (Goshenite). The wide range of colourful beryllium has escaped the intrusive body and gems that make up the beryl family owe been transported into the Cr bearing contact their attractive hues to trace elements or metamorphic zone in the form of liquids or chromophores. In the case of emerald this vapours. involves a trace of chromium (or vanadium) that replaces a small amount of the aluminium Chrome is generally accepted as being the present in the beryl formula. However this is primary chromophore for emerald though not really so simple as it may sound since several major American laboratories have the coexistence of beryllium and chromium is stated that they consider vanadium to be an rarely encountered in nature. acceptable alternative. 51 / JEWEL TRADER / SEPTEMBER 2017 GREEN BERYL HELIODOR AQUAMARINE ROUGH MORGANITE Wholesale 210 (w) x 39 (h) mm Product list.pdf 1 2017/08/21 12:44 PM C M Y CM MY CYCMY K
MADAGASCAR14 KILOGRAM EMERALD CRYSTALGOLDEN BERYL WORLD’S LARGEST SPECIMEN OF EMERALD IN MATRIX, FROM MANANJARYGOSHENITE RED BERYL IS THE RAREST © COPYRIGHT JEWELLERS’ NETWORK FORM OF BERYL, DISCOVERED IN THE THOMAS MOUNTAINS OF UTAH IT WAS ORIGINALLY NAMED BIXBITE. THIS NAME WAS DROPPED BECAUSE OF THE CONFUSION IT CAUSED WITH THE MINERAL BIXBYITE. AQUAMARINE 52 / JEWEL TRADER / SEPTEMBER 2017 ARTHUR THOMAS FELLOW, GEM-A(GTBR) / GRADUATE GEMOLOGIST GIA (USA) / CERTIFIED EVALUATOR (SA) GIA 210 (w) x 39EM(hA) ImLm:.ApdRfTHU1 RT2H01O7/M08A/S21GEM1:[email protected] / TEL: 011 784 0172 / FAX: 086 692 0244 C M Y CM MY CYCMY K
VSIT US AT SM WATCH WHOLESALE (PTY) LTD • Address: No. 9 Bazaar Street, Asiatic Bazaar, Pretoria, South Africa Tel: 012 323 1774 • Fax: 012 325 7097 • E-mail: [email protected] • Website: www.smwatch.co.za53 / JEWEL TRADER / SEPTEMBER 2017 Suppliers of calibrated smalls, certified diamonds and diamond jewellery 27 Ridge Road, 3rd floor Tel:0110276927 West wing, Parktown 0786003825/0833938199 Johannesburg Email: [email protected]
54 / JEWEL TRADER / SEPTEMBER 2017 © COPYRIGHT JEWELLERS’ NETWORK
FEATURED ARTICLE DANGEROUS INSTRUMENTS In this modern Diamond/Moissanite testers So now that we know what we are testing and its limitations I would age we are used to Firstly it is important to know what encourage that we use these having a machine, a you are testing and what the testers in conjunction with close device or an app for limitations are. The first diamond observation and other traditional just about any task testers worked by measuring tests before making a final decision thermal conductivity ie. how well on a stone’s true identity. the material dispersed heat. LEFT: 55 / JEWEL TRADER / SEPTEMBER 2017 imaginable. This method works well but you THE TRADITIONAL have to adjust the sensitivity based LINE TEST IS STILL So it is not surprising then that we on the size of the stone as larger QUITE EFFECTIVE find our trade turning to ‘machines’ stones will always disperse heat FOR WELL CUT for help when faced with the task of better than smaller ones. When ROUND BRILLIANT testing stones for their identity. Moissanite arrived on the scene we STONES. HERE WE needed a new way to differentiate CAN CLEARLY SEE Last week alone we had five diamond as moissanite was able to THE LINE THROUGH clients claiming their stones to be pass the thermal conductivity test. SYNTHETIC SPINEL diamonds based on the famous (TOP) AND CUBIC diamond tester, and one lady in a It was discovered that moissanite ZIRCONIA (BOTTOM). panic because a sales assistant had a degree of electrical in a jewellery store had told her conductivity that was enough to A FOIL BACK PASTE SHOWING that the stones in her ring were not differentiate it from non conductive CONCHOIDAL FRACTURE AND diamonds. diamond. There are some important CHIPS AROUND THE GIRDLE THAT limitations to be considered. INDICATES HOW EASILY IT IS I am not suggesting that we refrain Firstly some diamonds conduct DAMAGED AND ITS LOW HARDNESS. from using ‘machines’, but rather electricity like blues and some black to encourage that we don’t forget stones that will fail when using a to use observation and logic in diamond tester. the process. The two instruments that, in my opinion, are most Secondly the smaller the stone the likely to lead people astray are less likely it is to test as diamond. the diamond/moissanite testers And lastly when testing stones in a and reflectometers, that are mount be aware that if the probe misleadingly marketed as digital touches metal it will not test as refractometers. diamond. Directory Strip B 210 x 39mm.pdf 1 2017/08/21 9:09 AM C C M M Y Y CM CM MY MY CY CYCMY CMY K K
LEFT: MULTI TESTER, TESTS BOTH THERMAL AND ELECTRICAL CONDUCTIVITY.Digital Refractometer/ Today they are marketed as digital A REFLECTOMETER THAT USES INFRARED © COPYRIGHT JEWELLERS’ NETWORKGem Tester refractometers or gem testers. TO MEASURE REFLECTION AND GET AN There are some limitations andAgain it is important to understand some advantages to this method. IDEA OF A GEMS REFRACTIVE INDEX.what we are testing and itslimitations. So here we are looking Firstly the limitations, without the TRADITIONAL REFRACTOMETER ANDto learn the refractive index of a contact liquid the readings are less DENSE CONTACT LIQUID.material which is basically its ability accurate and the condition of theto bend light. Light bends when its polished surface has an effect on SYNTHETIC SPINEL SHOWING SEVEREspeed changes, the more optically the result. When the surface has ABRASION THAT INDICATES ITS LOWdense a material the slower light a good polish stones often get acan pass through it and the higher much higher reading whilst stones HARDNESS.the refractive index. This property with a poor polish get a low reading.also has an effect on the criticalangle which is the angle where light The advantage to this methodchanges from being transmitted is that you can get a rough ideainto the gem to being reflected off of R.I.’s that are too high to getthe surface. an accurate reading with the refractometer because it is limitedThe most accurate and reliable by the contact liquid to R.I.’s belowway to measure a gem’s R.I. is 1.9. That is why reflectometers wereusing a refractometer which uses traditionally only used for stonesa high density liquid to create a whose R.I was higher than 1.9.contact between the dense glasshemisphere and the gem which In conclusion I hope that we allallows one to accurately measure remember to use the power ofthe critical angle and therefore the observation in conjunction withR.I. There is another instrument that these instruments and not trustcan give one an idea of a material’s blindly in their results.R.I. but it does so in a different way,it uses infrared light and measuresthe angle of reflection hence thename reflectometer.Directory Strip 210 x 39.pdf 1 2017/08/21 9:25 AM Cell: 082 490 0219 | Tel: 011 465 0208 56 / JEWEL TRADER / SEPTEMBER 2017 Email: [email protected] Web: www.agemlab.co.za Address: Suite 8, 4th Floor, Block E, The Pivot Office Park, Montecasino, Fourways, JHB, SA, 2055
愀 搀椀愀洀漀渀搀 椀渀 琀栀攀 爀漀甀最栀57 / JEWEL TRADER / SEPTEMBER 2017 㐀㈀ 䄀渀搀爀椀攀猀 猀琀爀攀攀琀 吀攀氀㨀 ⬀㈀㜀 ⠀ ⤀ 㐀㐀 㘀㠀 圀礀渀戀攀爀最Ⰰ 匀愀渀搀琀漀渀 簀 䘀愀砀㨀 ⬀㈀㜀 ⠀ ⤀ 㐀㐀 㘀㠀㈀ 簀 䨀漀栀愀渀渀攀猀戀甀爀最 圀攀戀㨀 眀眀眀⸀瀀漀猀琀攀砀⸀挀漀⸀稀愀 ㈀㤀 攀洀愀椀氀㨀 渀攀琀眀漀爀欀䀀瀀漀猀琀攀砀⸀挀漀⸀稀愀
VSIT US AT Since 1992 Nick the Pearl Man has been at the cutting edge of glamour and style with imported excellence Garnet Stone set CZ set in Silver Button Pearls set CZ set in Silver Mabe set in Silver in Silver in SIlver Mabe set in Silver CZ set in gold CZ set in Silver CZ set in gold (9ct/y) and Silver (9ct/y) and Silver Tel: 012 804 3701 | Fax: 012 804 5527 © COPYRIGHT JEWELLERS’ NETWORK Cell: 082 893 6444 | Office: 082 373 6724 Email: [email protected] 58 / JEWEL TRADER / SEPTEMBER 2017 www.nickthepearlman.co.za
VSIT US AT59 / JEWEL TRADER / SEPTEMBER 2017 3D Printing Has Transformed The Jewellery Industry Adding a 3D printer to your workflow will change your jewellery manufacturing business. BEWARNED! Some 3D Printers may look the same. But they will not produce the same results. Details that matter, that you don’t know to ask about, can prevent you from getting the results you need to succeed and cost a lot more than the shelf price ‘savings’ that look so attractive. Chat to the experienced team at to make sure you get a solution that works for your business. 086 100 0185 | www.rapid3d.co.za
GOLD VSIT US AT IS BACK! Stand D2 E-mail: [email protected] © COPYRIGHT JEWELLERS’ NETWORKTanya - Sales and Merchandising (+27 82 556 7316) 60 / JEWEL TRADER / SEPTEMBER 2017 Angelique - Sales Executive (+27 76 521 2283) Cathy - Sales Orders / Logistics (+27 11 418 1600)
61 / JEWEL TRADER / SEPTEMBER 2017 JE WELLE X AFRIC A 2017 Africa’s Premier Jewellery and Watch Exhibition 8-10 OCTOBER 2017 SANDTON CONVENTION CENTRE, SANDTON, JHB, SOUTH AFRICA +27 11 484 5528 | [email protected] | www.jewellex.co.za | www.facebook.com/myjewellex
Metal Concentrators SA (Pty) Ltd is the © COPYRIGHT JEWELLERS’ NETWORK guarantee of purity & authenticity. 62 / JEWEL TRADER / SEPTEMBER 2017 We are esteemed members of both the South African Jewellery Council as well as the Responsible Jewellery Council. We supply all forms of precious metal waste. Our casting division offers CAD designing, casting and Please contact:CPT: 021 510 0770 | PTA: 012 000 4440 | DUR: 083 600 2210 [email protected] | www.metcon.co.za PIONEERS IN PRECIOUS METALS
Specialist supplier of fine quality Tanzanite FoundationTMcertified loose tanzanite and certified Tanzanite BlueTM jewellery. www.tanzanitecompany.co.za [email protected] C +27 82 601 3621 [email protected] C +27 83 231 8919 P.O Box 85084, Emmarentia, 2029 T +27 11 446 5900 F +27 86 614 7433
Search
