Been in the industry for 7 years. There is no difference really CVD/HPHT i wouldnt worry about it as the customer. On our side as the retailer our wholesale cost is really the same whether its CVD or HPHT... I have also heard that technically cvd is "the most pure" they are type 2a. But i really do not think it matters.... Same with post growth treatment. Our cost is the same post growth/no post growth. It dosent really make amy difference..... You shouls really just be focusing on 4cs gotta watch out for IGI i have seen F's that should be H's and are brown in color.
Thanks so very much for the pertinent data. Before this, I was under the impression that HPHT was the superior methodology. For us diamond lovers, would have been great if you exhibited a measure of show and tell. (The sparkles drive me crazy)! Cheers, Alaskana
I was in the exact same boat, I thought the post treatment was a sneaky way to make a worse diamond better, and that CVD would brown again over time. I have a pair of HTHP studs that I love (they’re vvs2 e-color xxx to be fair) but was looking to upgrade because they’re only 1ctw (0.53 each and wanted something a little bigger like 1.5-2 ctw, but everything I found at the same color/cut/clarity at that size was CVD, and this video got me to pull the trigger
Video at 2:00. Not agree. I have had natural grown color treated hpht diamonds, certified from the most important LAB's known in bussiness. On the certificate it was written, natural grown color treated hpht. So it is true that they come from a lab but they are natural grown. CVD diamonds are not bad at all, but they are grown in a lab.
Great video! Thank you for increasing my knowledge! So, after many years of scoping earth-minded diamonds, I'm now doing a deep dive on the lab-grown ones. One thing I keep noticing in the lovely new 70x high-resolution videos, is graining. I kept looking at them and thinking, it says polish is excellent, so why am I seeing lines that make it look like someone has taken low-grit sandpaper to this diamond??? I finally got around to googling "striations in lab grown diamonds" and read (very quickly) that the lines are in the stone itself (makes perfect sense) and that this sometimes this happens when they start and stop the growth process too many times (reasons not stated, "fixing" something I assumed). Anyway, the questions I have are these: 1) is the start-stop reason I read about CVD stones correct, and 2) how much of these striations should I accept before they impact overall clarity. I've always been an eye-clean is quite good enough girl, but I confess seeing all those striations kinda weirds me out. They seem pretty obvious, to the point that some of the stones I see make me concerned about the overall clarity/haziness of the rough and the finished stone. I've also noticed that the price per carat of larger stones, starting around 2 cts (I'm looking at some OECs and OMBs) can be SIGNIFICANTLY higher (HPHT vs CVD perhaps?) but to be fair the clarity of those stones under the high magnification of the videos, also seems higher. I know this is all over the place, but can you elaborate on what might be going on here? Telling me I'm overthinking this IS an option. I do tend to do that. ;)
This video by GIA will help explain the growth lines. When we grade diamonds, we use 10x and 30x magnification. So the lines are not noticeable to the consumer. Keep in mind the technology and process is constantly being improved. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-35ZSy_y5Umc.html
Oops. Perhaps I should have read more of the replies - and just more in general - as it appears that others have asked about this too. Silly me. Sorry to bother!
All I care is me liking the look, size and shine;)) more bling is better. I’m owning 1,5 carat lab grown diamond in like Cartier 1895 setting and it was given to me so I have no idea if it’s hpht or cvd. All I know it’s to perfect (clarity and color)and it’s to white in my opinion (if tit make sense). I bought 4,55 carat wedding band also in d color vvs hpht lab grown and I love its shine. Still if I would be able to afford I would choose natural one.. and surprisingly in color F (perfect clarity and cut of course) I just like that shade, or simply I feel it matches better with my skin shade.
And that is why the lab grown diamonds have impacted the natural market. Many people feel the same way you do. With lab grown diamonds, it makes it much easier and affordable to get something you would never consider.
CVD OR HPHT DOSE NOT MATTER, IF YOU ARE BUYING A LAB DIAMOND OF COUSE YOU WILL BUY THE COLOR LESS AND AT LEAST VVS2, because the much won’t be that much different anymore. But the post growth treatment does. Post growth treatment Diamond are more easy to chip.
Post growth treatment is the same treatment as HPHT. So technically go through the HPHT process. Furthermore, HPHT does not make the diamond easier to chip. Not sure where you got that information, but this is incorrect.
I read somewhere that there is a possibility that a post treated CVD diamond may revert back to its original condition years after the treatment. Is this possible? Also it said that the post treatment can make the diamond hazy.
Let me put it this way, CVD diamonds with post growth treatment is treated with HPHT treatment. The SAME treatment that HPHT diamonds go through. So if (big if) that were true, it would be the same for HPHT diamonds. I have not heard this at all. What condition would it resort back to? The color would change? Then again same would be true with HPHT diamonds. The industry has been color treating diamonds for decades with HPHT process.
Thank you so much. This is the first actual honest answer I’ve found because I was pretty hung up on it. I am currently looking into upgrading to a bigger pair of studs because I have a pair of 1ctw HTHP (that I love. They’re e colored vvs2). I thought HTHP was better since it mimics the earth conditions and since it doesn’t get treatment I thought that they are more “real” and thought CVD could fade back to brown over time. I didn’t know CVD was actually more pure, and the treatment was 1) just HTHP and 2) used on naturals as well. I’m not willing to compromise slightly on clarity, color, and ESPECIALLY not on cut. But every set of stones I could find that were vvs2 e-f colors at that size was CVD. So I feel a lot better about pulling the trigger on these bad boys
Thank you for your infomation. Further more, could you please knowledge me on the hardness between the 2 types of the lab created diamond? ( not means according to molh scale which is 10). Thank you.
I have bought many lab grown diamonds. I need to know why NONE of the HPHT stones I have bought test as diamond on my testers? I do not care which method is used to grow the stone, but it MUST test as diamond. I have a small business and I buy jewelry and diamonds, rings etc for some friends and customers. I cannot sell a lab grown diamond, telling my customer it is a real diamond, have it not test as diamond on a tester. Can you guys tell me why the HPHT does not test?? Thanks!
Not really sure what to say. All lab grown diamonds should test as diamond on diamond testers. Either your lab grown diamonds are not truly lab grown, or the diamond tested is not good.
On good testers, it's the electrical conductivity that will make it read as a moissanite. Something to do with boron & nitrogen as well I think I've read. CVD will test as diamond, the HPHT does not.
This is a VERY informative video. I just purchased a 4.53 carat emerald cut diamond, VVS1, E color, Excellent cut and symmetry, type iia. It is CVD made. I think what was left out in this video is because of the way CDV stones are created (grown in 1 direction) they can create a graininess in the stone that is not required to be disclosed on a diamond report. This graininess can often times not be seen in pictures with some e-commerce sellers and are usually identified by seeing a diamond with fantastic 4 C's but at a crazy low price (from my experience shopping for diamonds). For example, I purchased my diamond for $4500.00, this was a great price. I checked the market again and saw a similar diamond but was roughly smaller by half a carat. This diamond had zero pcitures available and was being sold for 2.5k which leads me to believe there are extremely visible growth marks on the stone. What are your thoughts on growth lines on CVD stones?
Hello - Thanks for the comment. Typically you cannot see the graining unless under magnification and a polarized filter. I have never heard of them being grown in one direction. I am curious to where you heard that from. You will see a difference in price from CVD and HPHT diamonds. I will say that the market has continued to drop on the Lab Grown Diamonds.
@mjgabel The main difference between HPHT and CVD diamonds is the way they grow or their morphology. HPHT diamonds grow in cuboctahedron shape and have 14 growth directions, while CVD diamonds grow cubic and have 1 growth direction. In comparison, natural diamonds grow in octahedron shape and have & growth directions. These growth patterns are also the main way to differentiate mined and synthetic diamonds. This is the whole reason why graining occurs in the first place. This information can be found on virtually any website discussing CVD vs HPHT diamonds.
Do you feel like the longevity of either type of lab grown diamond is the same as earth diamonds? I have heard that cvd diamonds aren't as strong as hpht and could crack more easily
i think hpht is better overall but if you get a cvd type 2a then that's the best, either way even me as someone who should care cuz i resell jewelry as a portion of income, but even i don't care too too much, if you're a normal consumer it's still a diamond there's no difference and nobody was a slave to make it, a gem factory even the worst ones has 100x better working conditions than physical labor mines, literally 100x better at worst, and if you're a reseller most ppl just care that it's real and you'll help them for life on their purchase and sell them something quality and be a reputable person who deserves their money. but a lot of the labs i buy from are HPHT and i've gotten some nice CVD type 2a from american auctions and i swear not even 1 buyer ever asked which method it was used to manufacture in my entire life.
but just look up rough hpht diamonds and rough cvd diamonds uncut unpolished straight raw off the lab and you will see why i like hpht compared to the common opinion of the cvd hype, and you'll see what i mean, but its the same at the end of the day no matter the cost to manufacture or what the public says.
Yes, both CVD and HPHT will pass (as diamond) on electrical cond. Diam testers). When you say glow in the dark, are you referring to diamond fluorescence?
I watched a video that the electrical cond. diam tester test the hpht diamond as synthetic moissainate..but cvd diamond pass the test..plus the lab diamond appear to glow in the dark after sunlight exposure (orrange glow) i want to know more about this..a video of the explanation if possible😅
@@maszuinmahamad7866 - Those elec Cond. testers are not very good. I have seen many time natural diamonds test moissanite on them. They are very finicky and not very accurate. Those testers are low end, low budget. There are much more accurate testers on the market. We use the Falcon, which test all diamonds (lab and natural) and also CZ and moissanite.
Yes, that is my concern as a seller. I have at least 3 very pretty HPHT stones right now and NONE of them test as diamond on my testers?? The process of growing the stone does not matter to me, but they must test as diamond for me to sell them as diamond. If I tell my customer the stone is a real diamond, it must test as a diamond. And yes, I do tell my customer it is lab grown. @@maszuinmahamad7866
@mjgabel, thank you for this knowledgeable video on CVD vs HPHT lab grown diamonds. I see you told this person to look for GIA OR GCAL certification, I have come across many lab diamonds especially CVD lab grown with IGI certification. Is IGI not a good diamond grading lab ?
@@leeleelv IGI is most common, problem is their color grading is a bit sloppy. Many of the the H color stones we see from IGI are actually I-J color. So just be careful when shipping / comparing an IGI certified lab grown diamond. Most likely the color on the cert will be incorrect.
@@leeleelvrule of thumb with IGI, expect one clarity grade and color grade lower. It can cause you to over pay if you aren't careful. GIA is much more accurate, but that also comes with a higher price tag.
Thanks! Few questions... Would you place a high priority on screening CVD diamonds that are "as grown"/no post growth treatment? Would you still prefer a CVD stone that has post growth treatment to an HPHT stone without treatment? And lastly, when IGI states a CVD diamond "may contain post growth treatment" does this simply mean they cannot tell and that it may or may not, or that it does but no evidence of it is visible? Seems to be some ambiguity over what this means. My main concern is trying to find ways to weed out the brownish tint on some CVD diamonds that can be present even if the diamond is graded as colorless (DEF)
Hi Aaron! Yes, I would still prefer a CVD diamond with or without post growth treatment. IGI and other labs indicate that the diamond "may" have post growth treatment for two reasons - one, it is not necessarily detectable. Two, since it is part of an industry standard, it can be assumed that the stone may have been treated, but does not impact the grading or visual appearance of the stone. Similar to the way Emeralds can be assumed to be oiled, or treated, unless otherwise stated. I will give the same advice I give regarding color on an earth-mined diamond - you really need to see the stone in person to determine if it shows any tint (though a brown tint would be rare to see in a DEF since by principle that color grade should be a diamond with little to no saturation at all). Earth mined diamonds can have color in either a yellow or brown form, so going simply off a color grade will not guarantee you receive a diamond with a yellow tint over a brown tint. If you are looking to purchase a lab grown diamond online, I would just ensure they have a return policy. I would also say the best way to detect any tint would be to bring the diamond into the natural sunlight. Anything else, please let us know!
I've learned that lab diamonds may change color and lose sparkle over time, especially when you have it cleaned and polished. That sucks. Natural is still better.
Enhanced diamonds are earth diamonds treated with HPHT... They are called HPHT diamonds. With seed grown lab diamonds now its getting confusing when HPHT is referenced 😂
