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Haze On Old Diamond


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A variety of things. Most common:


1) Dirt. Diamonds are grease magnets, and unless cleaned thoroughly and regularly they tend to get dirty, particularly on the pavilion ("underside"). Leave it for a few hours in a bowl with hand-hot water and some dish soap, then scrub gently but thoroughly using a toothbrush and paying particular attention to the pavilion. Repeat if necessary, rinse - ideally in distilled water or alcohol for the final rinse - and dry off with a lint-free cloth or a chamois leather.


90% plus cases of "change in appearance" are due to dirt - in some cases it's very stubborn, and then you may need stronger chemicals than soap, but let's take one step at a time (also, stronger chemicals can be dangerous to you and/or the diamond and/or the setting it's in).


2) Scratches. Even if diamonds are very hard they aren't indestructible, and other diamonds scratch them easily (and so do other stones - it's just that the other stones wear down first!). Particularly an old stone that has been kept with other jewellery in the same box will tend to show wear around the edges of facets that looks like a haze. Not dissimilar in look and feel to old pieces of glass (or even new relatively soft glass after it has been in the dishwasher for quite a few cycles).


This is a particularly bad example: 0600dg2.jpg


3) Poor polish to start with. Old stones weren't necessarily finished to the same standards as today's, and if you are seeing something through a loupe for the first time you may notice patches of poor polish... that were always there. In many - but not all - cases, it can be repaired; it will require removing the stone from the setting and having it repolished by a cutter.


4) Fluorescence. Some stones will become hazy when exposed to UV light, even just the UV present in sunlight. The good thing is that the effect goes away once you remove the UV. The bad thing is that there is nothing you can do about it.


5) Heat. It needs to be pretty extreme - over 1400 °C - but a torch used in jewellery repair goes easily at 2000 °C, so it's possible that a not-very-careful repair has ruined a surface. Again, it can be repolished, usually with minimal loss of weight, but if the heating has been severe the whole stone may be ruined.


(6) It's not a diamond. Not really a "cause", but since pretty much any other stone is significantly softer, wear will set in much more quickly in simulants including white sapphire, white topaz, rutile, quartz, strontium titanate, YAG, GGG and CZ. All used with varying success to imitate diamond, but all much much much softer. Moissanite is harder - almost as much as diamond - but it's also much more recent, so it's unlikely to have been the stone of choice in a 100+ year old ring).

Edited by davidelevi
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  • 1 year later...



This is a list of internal characteristics (copied and pasted from another website - I know which one, BTW), not a list of causes of possible haze. Some may cause a "haze-like" appearance, but not all.


The original thread is nearly 2 years old.


What's your point in posting an irrelevant answer to an old thread?

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