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  1. John Pollard

    Just curious, but why don’t we see a lot of Q-R, S-T, & U-V stones?

    My apologies for missing the question. Thanks @Karl_K for catching it. No correction needed and I can elaborate. @cflutist it was not a decision. We have only one cutting target. The challenge for us is winning rough material. To explain further, traditional diamond producers change their...
  2. John Pollard

    Just curious, but why don’t we see a lot of Q-R, S-T, & U-V stones?

    Totally wrong. Terrible answer. Just kidding. He's right. I would HRD to the list of reliable FCD grading labs, from a global perspective. While doing that, I'll congratulate Ellen Joncheere here. She takes charge on Monday.
  3. John Pollard

    IF Clarity Diamond Unanswered Question?

    RE grading versus plotting: GIA and AGS use a forest-first, trees-next approach using the buzzwords "obvious, noticeable, minor and minute." The first C determined by the grader is clarity. The diamond is viewed in darkfield lighting, face-up, at 10X and the grader makes a decision based on...
  4. John Pollard

    Just curious, but why don’t we see a lot of Q-R, S-T, & U-V stones?

    Adding to @Karl_K 's comments. Also a money matter. Producers often plan them with angles which window or trap light inside (both of which emphasize body color) and submit them hoping to get fancy light yellow or brown. Remember the effects of cutting can change the color grade with FCD's...
  5. John Pollard

    “Yellow diamonds are inferior” what do you think of that statement?

    I was going to say the same thing using the term indoctrinated. Are yellow houses inferior? Yellow cars? Of course not. They're a matter of taste. Or a master-planned community. Mother nature master-planned diamonds a billion years before homo-sapiens existed. It took us another 200,000 to wipe...
  6. John Pollard

    Should we discourage or recommend FL stones?

    I second this for any enthusiast. In addition to Karl's link, some handsome young chap did a teaser and posted purchase info when it debuted. https://www.pricescope.com/articles/_french_blue_richard_w_wise_gg I see it's available on Kindle at only $9.99.
  7. John Pollard

    Lets make some diamond knowledge courses, with a quizz

    Adding my two-cents here. Putting together Q&A is a cool idea, but without a design philosophy and hierarchical structure it won't be "coursework." It will be an interactive FAQ. Curriculum design on an effective scale requires advance planning and methodology. Example: The three basic...
  8. John Pollard

    Help Amateur evaluating Stones and Labs

    When considering carat-weight be on the lookout for the diamond's spread in mm. A well-cut 2-carat diamond will spread somewhere around 8.15 mm. Beware those cut with steep angles intended to keep extra weight in the diamond. The pricing may be friendlier, but it's because you'd be buying a...
  9. John Pollard

    ASET & color

    Be careful with that chainsaw, sir.
  10. John Pollard

    ASET & color

    Thanks Karl. Putting them all together. I'll admit to thinking normal range, not FCD. With the example above in-play, does anyone want to try and poke holes in my highlighted comments? Beware, I might poke back. :devil:
  11. John Pollard

    ASET & color

    Merry and Happy to you and yours too, my friend. And to all. =)
  12. John Pollard

    ASET & color

    Nice example. Can you post the CGI ASET?
  13. John Pollard

    GIA vs DPL results

    That's the most defensible answer. It lands in the perceived range for P by majority opinion at two grading labs. Right. Imagine this scenario. You're a weather-expert, placed in a cold room, asked to name its temperature. You and your peers can agree on whether it's near-freezing...
  14. John Pollard

    Debeers ruining our oceans for diamonds

    You're quite welcome. The author is a good writer but his use of DeBeers' to lead the article seems like a red herring. The reference to Nautilus Minerals was a more valid example, although it's no longer in play. NM was a controversial DSM (deep-sea miner) targeting hydrothermal vents in New...
  15. John Pollard

    Debeers ruining our oceans for diamonds

    The article is correct, but it's primarily about deep seabed access out in international waters. DeBeers' gets mentioned as established oceanic miners, which they are. But the ensuing descriptions of deep-sea damage which could shatter hot-springs, deplete species' and poison ecosystems -...
  16. John Pollard

    Overwhelmed newbie - requests experts advice.

    Cheers @TODiamonds. Here's a link to the original article. https://www.pricescope.com/articles/laboratory_cut_grades_what_report_doesnt_show
  17. John Pollard

    GIA tricked & cheated: +63% depth XXX diamonds

    Oh my. We have a strmrdr sighting. :cool2: I'm actually neutral about GIA's ultimate position on this. @Rockdiamond posed it well above. If two diamonds have identical weight and visual appeal...but one spreads notably smaller...there's no harm done if the jeweler responsibly sells the one with...
  18. John Pollard

    GIA tricked & cheated: +63% depth XXX diamonds

    Right. You're in good company. Can we tap the brakes for a minute? Here's how I have GIA-splained the existence of the published 63% limiter in the past. The 63% cutoff used in the manual, Facetware, etc. can be compared to our federal law that requires all school buses to stop at railroad...
  19. John Pollard

    GIA tricked & cheated: +63% depth XXX diamonds

    Bottom line, yes. The fallout in my travels (even in this thread) is the number of jewelers who are totally convinced no RB can be EX if it’s over 63% deep. I‘d like to have all the hours back I’ve spent GIA-splaining the contradiction to other pros in my workshops.
  20. John Pollard

    GIA tricked & cheated: +63% depth XXX diamonds

    Two reasons - 1. I provided you with the same depth limit information on Friday - directly from GIA's lab manual. It went unacknowledged. 2. Your post to Garry this morning said (again) << In fact GIA does not use a total height limitations for EX grade >> ... I did not realize you saying <<...
  21. John Pollard

    GIA tricked & cheated: +63% depth XXX diamonds

    Dear @Garry H (Cut Nut) and @Serg . With respect, I told you I can help (and I tried above) but only if you listen. You're both correct. But you're also so anxious to make yourselves understood that you might not be seeking to understand the totality. Garry... Serg is correct about what GIA...
  22. John Pollard

    GIA tricked & cheated: +63% depth XXX diamonds

    Hey Garry, did you completely ignore my posts? To quote Blazing Saddles: “Harumph!”
  23. John Pollard

    ASET & color

    To make sure we're on the same page: We are discussing 'colour' as chemical, not dispersive, correct? So seeing 'colour' here (common example) implies yellow or brown tint in the body of the diamond, yes? Presuming we are on the same page, above: Would you expect to see colour in those areas if...
  24. John Pollard

    GIA tricked & cheated: +63% depth XXX diamonds

    Right. They are not pre-penalizing a diamond for potential harm to a buyer. It makes sense from a clinical grading standpoint. The wrinkle is the presumption that buyers will know two "1-carat" diamonds can face-up with different spreads. As anyone who sees client-traffic knows, most new buyers...
  25. John Pollard

    GIA tricked & cheated: +63% depth XXX diamonds

    Come on @Serg , you know me better than that. =) I'm an education junkie. I attended the lab courses soon after they updated to their manual and curriculum in 2006. My copy was printed in 2007 and is connected with the current system.
  26. John Pollard

    ASET & color

    Cool question. My 2 cents - ASET gives the following information. 1. Does light entering the diamond in the face-up position exit through the bottom of the diamond? Areas where that happens will function like windows and appear black (if the stage under the diamond is black) or they will...
  27. John Pollard

    GIA tricked & cheated: +63% depth XXX diamonds

    I can help here. This is one of those areas where what GIA teaches departs somewhat from lab practice. According to the GIA Diamond Grading Lab Manual's cut-grade reference charts, 63% total depth is a high-cutoff for EX. When applying GIA methodology diploma-holders are taught to use those...
  28. John Pollard

    DeBeers Forevermark?

    If I personally agreed with the grading? Sure. Although I have another source for diamonds you know.=)
  29. John Pollard

    DeBeers Forevermark?

    Context may help here. This is a DeBeers initiative. You may recall that DeBeers' controlled rough diamond supply for a long time. That monopoly ended decades ago and since that time they've increasingly focused on the demand side of the diamond business. It started with a series of television...
  30. John Pollard

    Tip for finding a “near super ideal” without paying “super ideal“ prices?

    In many (most) cases you’re spot on. Nicely learned, well stated, and thank you for the comment.
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