Our Product Verification / Certification Guarantee
We are under an OATH,COMMITTED & CONSCIENTIOUS to sell High Purity products to our customers.Our client satisfaction is very paramount to us because we look beyound first supply but we look forward to long term busines supply which we can handle with professionality.We are forever faithfull to all client and we treat all buyers request importantly because we know Availability,puntuctuality,Transparency & straightforwardness is the key to all successfull business,Our samples are mainly for testing on the purpose of verifying the quality/purity of our high quality product.We encourage all buyers to start with very minute sample,
Our Gold Products:
All our Gold products must pass through a satified refinery /Assay Test.We have a process of removing impurities from Gold and smelting the Gold products to meet minimum of 94.97% AU Gold pure for allor Gold product.Our products are of high quality which meet up with LBMA/LME Standard.Our Gold are required to pass through a standard refinery test,these official testing channels are conditions set in place where the gold products are analyzed or assayed for precious metal content & Gold Validation comfirmation. Our Team of assayer are actually testing to determine that the fineness of the product conforms with the statement or claim of fineness that have being stated on the website sales display.www.robertsongoldmining.com.
Our Assay process remove the scrape but it is also cleaner, as it removes the need to subject samples to high temperature furnaces and the use of lead to extract impurities.
We are Affiliated to several reknown & LBMA Satified refinery which produce extremely accurate results. Accuracy is maintained by continual calibration against extensive reference standards and subsequent adjustment of the reading. The machines used by samplers at Assay Office are programmed to deliver confirmation that the article tested complies with a given test standard. Assay is carried out on a random selection of samples. The number of samples taken depends on the quantity of articles in the parcel and also the nature of the articles, the number of parts to an article and the different materials from which they have been made
Our Rough Diamonds / Gemstones products
All our diamonds are made to pass through the Diamond identification and Grade test before taken to our store.Our IGL Diamond Certificate provides a reliable and accurate documentation of a diamond’s identity and grade based on the internationally recognized diamond grading system. Using state-of-the-art equipment, each diamond is analyzed by several gemologists in order to provide the most accurate description of the diamond’s quality and characteristics. The carat, color, clarity and cut – commonly known as the 4 C’s of each diamond are clearly stated on each diamond certificate. Additional grading characteristics such as the finish, girdle, culet and fluorescence are also detailed on the certificate. A diagram of the diamond displaying any inclusions is also included on the certificate. IGL Matched Pairs Of Diamonds Certificates As every experienced gemstone collector knows - there’s no such thing as two perfectly matching diamonds which are identical in all respects. But it’s possible, albeit rare, to find flawless gemstones which are very close to perfect matches. When looking at the similarity of gems, the four C’s of each diamond needs to be compared – that of carat, cut, clarity and color. Ideally a pair will have been cut out of the same rough stone, and by the same cutter. Matching pairs are very rare in nature – particularly since both transparent and fancy color diamonds are so rare to find in the first place. And, the higher the grade of diamond, the harder it will be to find another to match it - finding one perfectly cut, flawless diamond is a rarity, but finding two is an exceedingly rare occurrence
Our Gemstones Certificate is used to document diamond pieces and identify the characteristics of the precious stones featured in each piece. Each IGL Jewelry certificate features a description of the gemstone piece followed by a statement of the characteristics and grading of the precious stones found in the piece. A statement listing the quantity of gemstones featured in the piece as well as a grading report of the gemstone’s weight, shape, color, clarity, cut, proportions and measurements are featured in the IGL Jewelry Certificate. In addition, the identification, weight and content of any precious metals found in the piece are described on the certificate.The Our LABORATORIES provides appraisals of Gemstones to the general public while, after physical examination of such pieces, its curators will be available to determine their genuineness and offer related information such as: characteristics,
Our Copper Cathode Verification Process
All our copper are made to pass through the International Organization for Standardization Test Before copper are taken to the Store.The Robertson Precious metal team have hired a Verification Team from ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
We have the Robertson precious metals copper Hired verification team from ISO.Our most used electrochemical processes for the production of high purity copper (99.99% Cu) are electrowinning (EW) and electrorefining (ER), both of them electrolytic processes where copper ions dissolved in metallic salts are deposited on cathodes. This electrolysis is performed in large tankhouses having normally 100 cells-connected in series, each containing 61 anodes and 60 cathodes. Each tankhouse is fed by means of a 12 pulse high-current rectifier normally rated at 40 kA. The quantity and quality of copper deposited on the cathodes, as well as the process efficiency, depend on the current density through the electrodes. Therefore the higher and the more even is the current density between cathodes, the better will be the operation of the plant, reducing harvesting times and increasing the yearly copper output. Current densities of 320 A/m2 (~640 A per cathode) are normally used in these processes, with harvesting cycle times varying from 150 in EW to 190 hrs in ER.