Polish

  • CDC announces the world’s largest untreated High-quality Created Diamond

    Recently, Created Diamonds Company(CDC) announced up-to-date the world’s largest high-quality created diamonds, which is supreme in both colour and clarity while without any post-growth treatments or enhancements. Shortly the stone caused much of a stir in the LGD industry. The diamond has been identified by the IGI (International Gemmological Institute) with relevant specifications showing below: Weight: 7.06 carats, Color: F, Clarity: VVS2, Cut: 3EX, Fluorescence: None Provided by Hangzhou ChaoRan Diamond Co., Ltd.(ChaoRan), this super diamond was created through CVD ( Chemical Vapor Deposition) method. According to ChaoRan staff, before being designed, cut and polished ,the rough stone weighed 28 carats. And the final come-out of the polished stone reached 7.06 carat. Which made it currently the world’s largest unheated high quality CVD round diamond. CVD (Chemical Vapor Deposition) is one of the 2 methods to create diamonds. HPHT (High Pressure High Temperature) represents the other. Speakingof the 2 technologies, HPHT was applied years earlier than its counterpart CVD tocreating gem-quality diamonds. HPHT diamonds has already emerged in the jewellerymarkets in 2010; while CVD diamonds started to show up from 2013 . In terms of grades, the colour of HPHT diamond usually can reachto D-F, but most of thestones’ clarity ranges around SI.While according to the industry, the CVD technology seems alwayslack of control in colour stability. A large proportion of CVD products need post-growth treatments or enhancements in orderto get better grading . Statistic shows that, a USA based…

    March 21, 2020
  • Retail Margins Could Be Boosting Man-made Diamond Sales

    While lower prices as well as marketed ethical and sustainable benefits relative to that of natural diamonds has been the prominent narrative around man-made diamonds, a seemingly less-obvious factor is also likely helping to drive the product: the profit margin they offer retailers.  When analysing the wholesale and retail prices of unbranded man-made and natural diamonds, it appears that the retail gross margin of man-made diamonds in popular carat-sizes is as much as 1.8-times that of natural diamonds (see below figures). To further quantify this, for example, in some cases aretailer would theoretically only have to sell $5,000 worth of man-madediamonds to generate the same gross profit as selling almost $10,000 worth ofequivalent natural diamonds. Here, “gross margin” is considered to be aretailer’s top-line profit when selling a diamond, i.e. the sales pricerelative to the wholesale cost of the diamond.  This is important metric for a retailer selling bothman-made and natural diamonds because the theoretical high gross profit marginof man-made diamonds serves as an implied incentivize to prioritize sellingman-made diamonds over natural –as long as the profit margin differentialremains in place. Further,…

    March 11, 2020
  • GSI CAUTIONS OF “TREATMENT IMITATION” IN LAB GROWN DIAMONDS

    Recently, Gemological Science International’s (GSI) Mumbailaboratory identified HTHP lab-grown diamond with what appeared to be a laser-drilledchannel. GSI researchers and scientists observed and studied this diamond sinceit would be highly unusual to laser drill a lab-grown diamond. Upon closerexamination, the “laser drill channel” was found to be a typical HTHP inclusionthat was cut open from top and pavilion. After this, the content of theinclusion was acid bleached out, while some residue was still present. Theremnants of the inclusion have a strong resemblance to a laser drill treatment– this treatment is generally used to “clean out” black inclusions and enhancethe appearance of a diamond. It is a common misconception that a diamond can be identified asnatural or lab-grown based on inclusions as the claim was made recently on GoodMorning America Investigates. In this specific case, a hasty and inaccurateconclusion could have been made that the diamond is natural, with theappearance of what seems to be a laser drill channel since there are norecorded cases of lab-grown diamonds with this treatment, nor would it currentlymake sense to laser drill these diamonds. “Diamond growing…

    February 26, 2020
  • Swarovski Debuts 16 New Lab-Created Diamond Colors

    Swarovski is looking to dominate in thecoloured lab-grown diamond market with the launch of 16 new stones. The world-renowned Austrian producer ofprecision-cut crystals, genuine gemstones and created stones first launchedlab-grown diamonds in 2018. This January, during Paris Haute CoutureFashion Week, the firm introduced coloured lab-grown diamonds to its portfolio. According to Swarovski, its curation of 16coloured lab-grown diamonds are “the most extensive, sophisticated assortmentof hues available on the global laboratory created diamond market today”. The fancy colours in the new Swarovski CreatedDiamonds collection are arranged according to four pillars, each referencingone of the creative communities in which the company has always played a vitalrole: fashion, art, music and architecture. These four pillars pay homage to Swarovski’shistory of mutually creative collaborations, and to the creativity on whichSwarovski’s heritage and enduring ingenuity were built. Each pillar containsfour cushion cut laboratory created diamonds, led by a hero colour – theboldest of the four – available in a 2.5 carat size. The other three coloursare 1.25 carats each. Every laboratory created diamond isimmaculately cut and polished according to the Swarovski standards of precisionand excellence,…

    January 23, 2020
  • Is There a Resale Market for Lab-Grown Diamonds?

    Last week, at the urging of a commenter, Ilooked into Kay’s and Jared’s policy for lab-grown diamond upgrades andtrade-ins, now that both of those chains are selling them. Suffice it tosay, it’s not the same as for naturals. Here’s Jared’s: Our diamond trade-in and upgrade services allowyou to take any diamond jewelry (excluding lab-created diamonds) you no longerwear and trade it in for a brand new one. Kay’s site has similar language. And so doesone of the biggest lab-grown diamond sellers online, Brilliant Earth. Lab-grown manufacturer Diamond Foundry hastraditionally touted its “forever 100% value guarantee”, which“guarantee[s] the value of your diamond forever” with a “free lifetimeupgrade.” At press time, JCK could not find the guarantee stilllisted on its site. The company did not respond to requests for commentabout the guarantee’s current status. (UPDATE: After this piece wasposted, Diamond Foundry emailed it’s “still offering” the guarantee butthe site “is focusing more on B2B sales right now so it is not currentlylisted.”) This is a thorny issue for the lab-grown diamond world. Given that technology cheapens over time, and created-diamond production isn’t limited by nature, most believe that synthetic prices will drop. In fact, that…

    October 25, 2019