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28 Mar-18:25:15 Re: collection of firmo espinar (Firmo Espinar)
28 Mar-09:37:50 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-19:47:08 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Pete Richards)
27 Mar-16:15:44 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-15:18:59 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Alfredo)
27 Mar-14:39:29 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-05:21:48 Re: the mim museum in beirut, lebanon (Mim Museum)
27 Mar-05:03:26 Re: trying to find information on rose/pink quartz and tourmaline associations. (Ning)
27 Mar-02:39:50 Re: the mim museum in beirut, lebanon (Tobi)
27 Mar-00:23:28 Re: collection of volkmar stingl (Volkmar Stingl)
26 Mar-00:53:41 Re: collection of volkmar stingl (Volkmar Stingl)
25 Mar-13:32:10 Re: collection of michael shaw (Michael Shaw)
25 Mar-00:25:58 The mizunaka collection - quartz (Am Mizunaka)
23 Mar-13:35:22 Re: collection of firmo espinar (Firmo Espinar)
22 Mar-08:32:28 Re: collection of michael shaw (Michael Shaw)
22 Mar-04:20:41 Re: the mim museum in beirut, lebanon (Mim Museum)
21 Mar-22:49:19 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-22:47:40 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-22:45:25 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-15:34:23 Re: the mizunaka collection - quartz (Am Mizunaka)
21 Mar-14:35:08 Re: jim’s mineral collection (Jim Wilkinson)
21 Mar-14:15:36 The 4th phoenix heritage mineral show (phms) hosted by mineralogical society of arizona (m (Chris Whitney-smith)
21 Mar-04:36:10 Re: the mizunaka collection (Tobi)
21 Mar-04:11:47 Re: jim’s mineral collection (James Catmur)
20 Mar-23:34:15 The mizunaka collection - quartz (Am Mizunaka)

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Question about cubic diamond crystals
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Elise




Joined: 22 Dec 2009
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PostPosted: Nov 26, 2015 09:09    Post subject: Re: question about cubic diamond crystals  

Hi Pete,

I ran across this old thread while searching for something by Professor Sunagawa - I love that photo!. Thanks to Dr. Tetsuo Irifune (Geodynamics Research Center , Ehime University, Japan), I had the opportunity a few years ago to examine a sphere polished out of synthetic nano-polycrystalline diamond. One of the papers I wrote about the experience is in part a literature overview, including the cutting and polishing of a sphere and the structure of natural polycrystalline diamond - it may be of interest given this discussion here. All the G&G journal's papers are now available in open-access pdf form as well as hardcopy: Skalwold, E.A. (2012) Nano-polycrystalline diamond sphere: a gemologist's perspective. Gems & Gemology, Vol. 48, No. 2, pages 128-131.
https://www.gia.edu/gems-gemology/summer-2012-diamond-sphere-skalwold
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Cheers!
Elise

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John Betts




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PostPosted: Nov 26, 2015 11:28    Post subject: Re: Question about cubic diamond crystals  

You can see a 71.64 carat black cubic diamond if you search Google for "71.64 carat dark-gray cubic crystal"
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