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What would you pay for this stone?


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Without seeing it? Not interested. Too high a risk of an I1, strong blue fluorescence, indifferently cut diamond turning up with something "unexpected" (or all too expected, if you know what I mean).


If I were buying this from a reputable jeweller with a good return policy, $6,600 is not an unreasonable price for something "graded like that", but variability in what I1 look like is such that it may be a total dog or a very nice stone - and the price may therefore be a complete rip-off or a fair price. Buying from a private seller is much more of a concern and would correspondingly alter my expectations (downward!) of what a fair price is.

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Thank you for your quick response. I will not buy it from a private person, it will be from a jeweller. I also read that I1 cuttings can be either good or very bad and as I'm not very knowledgeable when it comes to what to look for I find it hard. 

So any advice on what I shall look for when I look at it tomorrow? 

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Cut has not much to do with clarity, in the sense that you can have a poorly cut but internally flawless diamond and a very well cut but highly included one. This one doesn't score well on either count: it's a just-about-decent but not great cut and a big unknown in terms of clarity: there are I1 that are almost perfectly clear, and I1 that look like a dog's breakfast. And everything in between.

At the end of the day, what matters is what you (your lady) like(s) - but I still think you need to have a comparison to a really well cut, clear diamond. Ask the vendor to provide one of like size to compare. This should be your first step: you need to understand the trade-offs you are about to make.

Secondly, ask the vendor to show you the inclusions, first without a loupe or microscope and then with one if the unaided-eye viewing hasn't put you off the stone already. The objective is NOT to be put off, but to understand what's in there: what is "invisible" or "inoffensive" on day 1 often turns out to be unbearably noticeable on day 100.

Thirdly, try to look at the diamond in as many lighting environments as you can: jeweller's store spotlights are great at making stones look good. Does the stone still look good under flat, diffused light (e.g. fluorescent tubes on the ceiling)? What about natural diffused light? Direct sunlight? Very dim light (e.g. under a desk)? Very yellow light (e.g. low-power incandescent lighting)? Is the stone bright, sparkly and the inclusions not highly visible in most or all of these environments? If so, you are good.

The key in all of this is experience - and this only comes with repeated comparisons. At some point you may be able to do without a reference diamond that performs well, but until then, ask the vendor to help with a good comparison (by which I mean similar colour, VS clarity or higher, no fluorescence to avoid risks of haziness due to that, and a cut beyond reproach: excellent symmetry, a pavilion angle of 40.6° to 41°, a crown angle between 34° and 35° and a girdle not more than slightly thick). 

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