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High Pressure High Temperature (HPHT) diamonds

Phoenix

Phoenix

Ideal_Rock
Premium
Joined
Oct 5, 2006
Messages
9,975
Hmmm...I've been wondering abt this for a while now, ie. whether diamonds can undergo some heating process to improve their colouring; and apparently they can and I have indeed just found such a diamond listed by one of the online vendors.

What do the experts think of these? Any chance such a diamond's colour can revert back to its original lower colour over time? Any other issues associated with these HPHT diamonds?

I am thinking if this process is permanent, then wouldn't it make sense for us to buy these diamonds as invariably they're priced much lower than "untreated" diamonds of the same higher specs.
 
Bump for answers.
 
i wouldn't buy one... ::)
 
and why, DF? The discount is quite steep and if the colour doesn't revert back to its original colour then surely it's a deal?! :wink2:
 
Phoenix|1334472566|3171418 said:
and why, DF? The discount is quite steep and if the colour doesn't revert back to its original colour then surely it's a deal?! :wink2:
Click to expand...
my dear Phoenix...with your good taste in diamonds i don't think you'll ever be happy with a HPHT stone,soooo stop trying to fool yourself into buying a HPHT diamond!!... :bigsmile:
 
Ha ha, thank you, DF. I guess you're right, I wouldn't buy one personally.

I *am* curious about these though. I mean there isn't much infor abt these HPHT diamonds and I'd love to learn more about them.
 
Never mind. I've found more infor abt these.
 
Phoenix|1334477224|3171438 said:
Never mind. I've found more infor abt these.
Click to expand...

can you post it? i am curious
 
It means a lot to me that my diamond's clarity and color is exactly how it came from the earth - although I accept it will be cut and polished of course.

IMHO, treatments make it a little more man-made and less what nature made and less of a marvel.
If I was going to slide down the slippery slope of man-made I could just get some 10-ct honker purdy thing for $100.
That's just me, and I know people vary.
Nothing wrong with buying whatever you want, as long as treatments are honestly disclosed and verified by a competent independent gem lab.
 
‘Treatments’ in the gem world is a curious topic. With certain stones, like tanzanite, it’s just assumed. ‘Untreated’ tanzanite is mostly not available and there's no gemological way of separated the treated from the untreated in many cases. Certain stones, like rubies, are nearly always treated and if a seller claims otherwise they’re expected to come with a stack of ‘proof’ to back it up. There’s a significant trading premium on stones that meet the bar and both the buyers and sellers of such stones are aware of it. Some, like diamonds, are normally sold ‘untreated’ and the discount for various treatments varies from significant to huge. Is it worth it? That’s up to you. Yes, HPHT is permanent and yes, it makes the stone look different/better. Fancy pink HPHT’s are a fraction of the cost of similar natural counterparts and that makes them available to more people. That's good. Then again, the untreated stones were usually a color that wouldn’t sell very well and they’re looking to move it at a premium. That’s why they treated it.

Once upon a time, laser drilling was determined to be part of the standard cutting process. Then the FTC changed their mind and now it’s a treatment. The stones are what they are, and they’re lovely or not without regard to what the FTC says but they now trade at a significant discount when compared to otherwise similar un-drilled stones. The people doing the drilling are basically out of business and the people who have stones that 20 years ago would have been drilled are now being sold without it. You would be hard pressed to buy a drilled stone even if you wanted one unless you were pretty flexible in other areas and something tells me that the ‘discount’ is going to evaporate for this reason alone. We’ll see. Predicting the future is a job for a psychic, not an appraiser.
 
denverappraiser|1334535059|3171918 said:
‘Treatments’ in the gem world is a curious topic. With certain stones, like tanzanite, it’s just assumed. ‘Untreated’ tanzanite is mostly not available and there's no gemological way of separated the treated from the untreated in many cases. Certain stones, like rubies, are nearly always treated and if a seller claims otherwise they’re expected to come with a stack of ‘proof’ to back it up. There’s a significant trading premium on stones that meet the bar and both the buyers and sellers of such stones are aware of it. Some, like diamonds, are normally sold ‘untreated’ and the discount for various treatments varies from significant to huge. Is it worth it? That’s up to you. Yes, HPHT is permanent and yes, it makes the stone look different/better. Fancy pink HPHT’s are a fraction of the cost of similar natural counterparts and that makes them available to more people. That's good. Then again, the untreated stones were usually a color that wouldn’t sell very well and they’re looking to move it at a premium. That’s why they treated it.

Once upon a time, laser drilling was determined to be part of the standard cutting process. Then the FTC changed their mind and now it’s a treatment. The stones are what they are, and they’re lovely or not without regard to what the FTC says but they now trade at a significant discount when compared to otherwise similar un-drilled stones. The people doing the drilling are basically out of business and the people who have stones that 20 years ago would have been drilled are now being sold without it. You would be hard pressed to buy a drilled stone even if you wanted one unless you were pretty flexible in other areas and something tells me that the ‘discount’ is going to evaporate for this reason alone. We’ll see. Predicting the future is a job for a psychic, not an appraiser.
Click to expand...

Well, that is a step backward. IMO of course :halo:
A stone that benefits from drilling benefits from drilling... I would certainly rather have such a stone drilled than un-drilled, premium or no! I take no "mind-clean" issue with drilling/bleaching though, whereas HPHT does cross my personal threshold, for whatever reason.
 
denverappraiser|1334535059|3171918 said:
‘Treatments’ in the gem world is a curious topic. With certain stones, like tanzanite, it’s just assumed. ‘Untreated’ tanzanite is mostly not available and there's no gemological way of separated the treated from the untreated in many cases. Certain stones, like rubies, are nearly always treated and if a seller claims otherwise they’re expected to come with a stack of ‘proof’ to back it up. There’s a significant trading premium on stones that meet the bar and both the buyers and sellers of such stones are aware of it. Some, like diamonds, are normally sold ‘untreated’ and the discount for various treatments varies from significant to huge. Is it worth it? That’s up to you. Yes, HPHT is permanent and yes, it makes the stone look different/better. Fancy pink HPHT’s are a fraction of the cost of similar natural counterparts and that makes them available to more people. That's good. Then again, the untreated stones were usually a color that wouldn’t sell very well and they’re looking to move it at a premium. That’s why they treated it.

Once upon a time, laser drilling was determined to be part of the standard cutting process. Then the FTC changed their mind and now it’s a treatment. The stones are what they are, and they’re lovely or not without regard to what the FTC says but they now trade at a significant discount when compared to otherwise similar un-drilled stones. The people doing the drilling are basically out of business and the people who have stones that 20 years ago would have been drilled are now being sold without it. You would be hard pressed to buy a drilled stone even if you wanted one unless you were pretty flexible in other areas and something tells me that the ‘discount’ is going to evaporate for this reason alone. We’ll see. Predicting the future is a job for a psychic, not an appraiser.
Click to expand...

Thank you, Neil. As usual, your post is very informative.
 
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