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New Diamonds, New Jewelry / Re: Your name, in diamonds!
« Last post by Diamondsbylauren on May 17, 2017, 08:35:38 PM »
Hi,
Sorry for the slow reply
Yes- we've still got the diamond letters!
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New Diamonds, New Jewelry / Re: Your name, in diamonds!
« Last post by CollinG on May 13, 2017, 05:19:53 AM »
Great idea. Are you still making these?
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How many is a good question... to which I think no-one has the answer, other than "a finite amount". Bear in mind that until 1700 diamonds were only known to come from India, then Brazil was added and for nearly 200 years that was it. Then came South Africa, Russia and several other places. It looks like current mines in Australia are getting exhausted - including one of the main sources of pinks (Argyle mine), and we know much of the Earth's surface well enough to make major discoveries relatively unlikely.

This said, there are still areas that are relatively poorly known from a geological point of view - poorly enough that more mines could be found e.g. under ice caps in Greenland and Antarctica, in Siberia or in central Africa.

Re: yellow: it's very common not least because most yellow diamonds are so coloured by the presence of nitrogen, which also helps the growth of the diamond crystal. In other words, it's easier for a large(r) diamond crystal to be (somewhat) yellow than to be perfectly colourless, which makes things like the Cullinan even more unique.

"New colours" is an interesting question: human vision sees whatever colours it sees and it's unlikely to change (except for currently rather extreme scenarios involving bionics), and while one can argue that there are infinite hues even within the Red-Violet spectrum, the human eye/brain ability for discrimination is finite...

I don't see (!) how totally new colours could be found, because the spectrum is already covered: we know of violet, indigo, blue, green, orange, yellow and red diamonds today, but there is a chance that new "never-seen-so-far" hues exist, and there are very good chances that no single human being has ever seen all those that exist: Stephen Hofer's rather monumental (750 pages) reference book about coloured diamonds ("Collecting and Classifying Colored Diamonds") has - as far as I can remember - nothing looking like these two, which were (are) however available to buy through DBL:




Diamonds under the sea floor are unlikely (at least unless we figure out ways of mining directly from the mantle): I think the oldest sea floor is about 200 million years, while most mined diamonds are significantly older than that. On the other hand, diamonds in outer space do exist: they are found (very small ones, so far at least) in meteorites called carbonaceous chondrites, and it is possible that some star nuclei are made almost exclusively of carbon, so once the star has finished its "active life" and blown off its outer layers in a supernova explosion what is left behind is effectively a giant diamond (or maybe a huge Lonsdaleite crystal? I don't think anyone has studied what happens to the crystallography of carbon under such extreme pressure/temperature) Ref: http://www.space.com/26335-coldest-white-dwarf-star-diamond.html
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Colored Diamonds / All the colors in the Rainbow...but how many of them!
« Last post by Dresden on April 29, 2017, 09:19:37 PM »
okay, soooo, thought to post this in the fancy color Diamond section because its about fancy color diamond of course  ;D

as i slowly get the the point of this post...

so we seem to know that fancy colors are rarer than other diamonds, i would say from my opinion the rarity of colour would go in this order, though i could be wrong, rarest is pure violet, next maybe it would be pure red, then maybe pure purple and so on and so forth

yellow seems to not be all that rare but who does not like a sunny Diamond!

it all has got me wondering how many more fancy color diamonds are out there left to be mined? will we run out soon, will we discover new mines with new deposits - some how i don't think we will discover new colors  ;D


i also got wondering are there diamonds under the sea, as in under the sea floor somewhere or even out of space! obviously i am not scientific or an expert at any of these subjects  ;D


Its all VERY INTERESTING!
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Thanks OMC - brilliant post and wonderful to hear your thoughts!
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Um, I don't know, Dresden - synthetic diamonds have been made repeatably since the 1950s, and are commercially available to the public since at least the late 1990s (maybe even earlier). Differently to what happened to pearls and corundum (but curiously not spinel or alexandrite), the availability of synthetics seems to have left prices of natural diamonds pretty much unaffected, at least so far. They have gone up, come down, gone up again, but all in blissful ignorance of the synthetic market.

On the "greenness" of synthetics, I am also relatively doubtful - it does take a huge amount of energy to synthesise a diamond, though it is perhaps a valid argument for coloured diamonds (especially blues, that can be grown with pretty much the same energy expenditure as colourless, but are much rarer naturally, requiring significantly more excavation work to find). This said, I have never seen an "energy balance" for either natural or synthetics, and it is very possible that synthetics hold the energetic upper hand, especially with the newer production methods (CVD) and considering exhaustion of natural sources.

Finally, AFAIK only colourless, yellow and blue can be synthesised "fully naturally". All the other colours require post-synthesis treatment like irradiation or HPHT. Size is also a problem, though there seem to be claim after claim of large (20+ ct) products, commercially available samples are rarely over 1.50 ct once cut. Perhaps the energy equations tilts the other way for very long production times?

The really interesting part about synthetic diamonds, for me, is the ability to produce monocrystalline sheets that can be used as a replacement for silicon or other materials (Ge, GaAs) as semiconductors in electronics. Unfortunately, I think we are still a couple of decades away from that...
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so now we are in the year 2017, technology in all areas is advancing and its hard to say how much more advanced it can go BUT now that the world has come to a point where human-kind can create DIAMONDS that are chemically, physically and optically the same as ones that earth took 150-odd million years to complete...one would say we have advanced very far, maybe too far???

okay, so that human-kind has now toyed with an ancient rock that has captivated the world since forever by its dazzling array of fire and sparkle, which no other mineral on the planet compares too, how do we feel about this?

some people will think its amazing that human kind has been able to compact 150 million-odd years into a few weeks, how long it takes to grow these Diamonds made of carbon, others will be horrified that its seems almost sinful to create something that took so long to create within earth and yet oh we can make that in a few weeks if thats what you want :)

from my point of view i think it is quite exciting that human-kind can grow a real Diamond over a few days or week but at the same time i am horrified that it seems to make real Diamonds seem like they were inefficient and a waste of time  ;D

sooooo, what this probably means is that the real earth-mined Diamonds will hold an ever more special place in a thoughts as they are something so old and not created in a lab by man or woman in a few days or weeks or will this mean that we no longer value the real earth-mined one and think more of the Lab created...

the whole selling point of the lab one's seems mainly to that earth was not harmed during the mining of these...as a green alternative...or a cheaper alternative.


we now have a choice...the Diamond that man or woman created for us in a few days or weeks or a Diamond that was created by chance and took many, many millions of years to form deep within the earth...we are spoilt for choice  ;D ;D
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Forum Chit Chat / Re: Do you have a dream tiara?
« Last post by malt80 on November 28, 2016, 05:49:13 AM »
once again thank you!!!
there are diamonds but small, and at the back is with gold..
thank you so much for your time!!!!
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Forum Chit Chat / Re: Do you have a dream tiara?
« Last post by oldmancoyote on November 28, 2016, 05:28:53 AM »
Ah... OK. Thank you for posting a much better quality second image. To my embarrassment I have to change my tune completely: I think it's a late 19th century "bright cut" tiara. No stones - only sharp polished metal surfaces that in the first photo looked like gem facets. This makes life easier in one sense: no need to worry about stone species, quality and size. On the other hand, the material value is definitely negligible (at best it's silver, and silver is currently trading for about $0.55/gram of pure silver), and the fashion for this kind of thing is long gone... so I don't think it's worth much, unfortunately.
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Forum Chit Chat / Re: Do you have a dream tiara?
« Last post by malt80 on November 27, 2016, 08:28:53 PM »
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