What is BETTER HPHT or CVD Lab Grown Diamonds? Which is the BEST CVD or HPHT lab grown diamonds
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- čas přidán 27. 06. 2024
- We have received many messages, calls and emails on this topic - what is better, HPHT or CVD Lab Grown Diamonds.
Other videos on this topic:
How Lab Grown Diamonds are made - and the difference between HPHT and CVD Lab Grown Diamonds.: • How Lab Grown Diamonds...
What is a Lab Grown Diamond: • Lab Grown Diamonds - E...
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Very informative! Appreciate your honest and professional take on this evolving issue. Thank you!
Thank you!
Thanks for this info. I just got a CVD diamond and absolutely love it. I didn’t have a preference for either method, but my ring turned out gorgeous.
Really helpful! Studying gemology so this is really good info!
This is a phenomenal video. Thank you.
Nate - Thank you for the feedback. We truly appreciate it.
Really helpful thanks for the info 4:09
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.
czcams.com/video/35ZSy_y5Umc/video.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!
No worries- Watch that GIA video. It is really interesting.
@@karenmott9862
@@mjgabel While some of it was over my head, I still learned a lot in general and got my question answered. Thank you!
good
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.
Hardness is the same for both.
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.
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.
@@danielnavarro2697where did you shop for your diamonds, if you don’t mind me asking?
I still prefer my HPHT diamond.
While the nuances are subtle, CVD and HPHT are as different as pulled synthetic ruby versus flux grown synthetic ruby.
Very nice video!
I have one question: Can a CVD diamond be treated with HPHT?Thank you!
Yes, that is the post growth treatment indicated on most lab reports for CVD grown diamonds.
@@mjgabel when will you bring more videos like this?
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.
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!
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 Type IIa is the most pure without any impurities. HPHT Type II have Impurities. it all depends which lab machine in which country creates it.
Correct. Thanks for the input and comment!
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 have not heard that, nor have we experienced that. Both types of lab grown diamonds are a 10 on the mohs scale.
Thanks for your reply, and sorry for my ignorance but... what's the mohs number for an earth diamond?
@@surajrambhia1742 - Both earth mined and lab grown diamonds are a 10 on the Mohs scale.
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.
Which will pass the electrical conductivity diamond tester? CVD or HPHT? Also will it glow in the dark?
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
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.
Hi. Can I know which lab grown diamond, HPHT or CVD type is more white D colour
Either. Just be sure to look for a certified lab grown stone preferably a GIA or GCal certification.
@@mjgabel Thank U 🙏🙏🙇♂️😃👍
@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.
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.
we are ONLY talking about Lab Grown diamonds here, not natural diamonds that have been HPHT treated for color.
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.
You learned wrong
Lab Grown diamonds are not new technologies.
The technology used today is new or improved from when lab grown technology started. CVD is new compared to HPHT.
Laught too much make it unhornest
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 😂
CVD = fake diamond