Clarity - Internal Graining

[xxxxxx]

Hi everybody,

with all these Clarity Threads I will hop onto the bandwagon. I'm still trying to understand MMD and especially what inclusions to avoid etc. This VS2 looks pretty clean. Just from the side it has all these specs that look like dust. I'm wondering if this would decrease performance (as in crispness of sparkle) of the diamond?
And I'm not sure but is this (see picture) the internal graining that people warn of in CVD MMDs?

Okay the quality of the picture gets terrible when I post it! But maybe somebody can see it by tur ing the diamond on the website.

https://www.brilliantearth.com/lab-diamonds-search/view_detail/8495024/

 

[OoohShiny]

My understanding is that is 'stria' - the layering effect created when CVD diamond growth is perhaps not controlled as tightly as it could/should be.

There was a thread on it somewhere on the forum - have a search for 'stria' and hopefully some wise input by John Pollard and Karl, amongst others, will pop up! There was comment that it can reduce light performance, and I think the HPD site has a page showing it amongst the other potential issues that may be seen in MMDs?


IIRC HPHT stones don't suffer with this effect, although I believe that Lightbox is CVD but doesn't have Stria issues, so the manufacturing processes would seem to have a direct effect on the outcome! (which would make sense... lol)

There are also CVD stones that are HPHT treated, to lift the colour - I'm not sure about Stria in those.

As always with diamonds, more to things than we might think!


EDIT: These threads are really useful

Newbie Question: Difference between Natural and Lab grown?

Hi, I am very new to this type of products (diamonds) and wondering how could some expert with years or even decades of experiences see the difference, using whatever tools are needed, between Natural diamond and Lab grown diamond? As far as I know experts also check and verify the structure...

www.pricescope.com

Unique characteristics in MMD

Take what you want and leave what you don’t. I haven’t seen the GCAL magnified images before and found it interesting: https://www.hpdiamonds.com/en-us/extra/173

www.pricescope.com

 

[xxxxxx]

I have poured over those threads already. The diamond I posted above seems of bad quality rough.

I wish the trade members or anybody would give us a direction on where to buy high quality lab diamonds (lab diamonds out of high quality rough without stria etc.). Until then it really is a guessing game!

 

[OoohShiny]

I have poured over those threads already. The diamond I posted above seems of bad quality rough.

I wish the trade members or anybody would give us a direction on where to buy high quality lab diamonds (lab diamonds out of high quality rough without stria etc.). Until then it really is a guessing game!

I feel your pain lol

There seems to be mostly these sort of stones out there and very few HPHT stones, but there also seems to be satisfied purchasers of these stones so perhaps each stone needs inspection individually to ascertain if it is negatively impacted?

Is Stria the new Strong/Very Strong Blue Fluor? lol


I'm not sure the Trade members can give any recommendations due to the non-promotion clauses within their membership T&Cs

Perhaps we consumers need to do more digging and ask more question of producers / suppliers, to confirm whether they are offering CVD or HPHT (or CVD+HPHT)?!

Personally I reeeeeeally hope that the producer making the ultra-minimised-nitrogen stones puts them onto the wider market - I want a 'better than D' stone, dammit lol

 

[SouthernElle]

There are a decent amount of CVD type IIa diamonds, I’ve come across quite a few. Someone just posted one from BE.