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Advice needed for this Diamond

T

TCKM12345

Rough_Rock
Joined
Dec 4, 2018
Messages
6
Hi Diamond-enthusiasts,

I will be proposing sometime in mid 2019. I have done my research on color, clarity and cut and even went down to the jeweler to learn more about the diamonds. But I am afraid that my knowledge on the subject is limited and jeweler might not be 100% honest with their comments.

I have identified this specific diamond. Based on the stats, it appears that cut-wise it is excellently cut. Color grading and clarity is within my expectation. However, I am a little concerned with the Fluorescence - medium blue. I have read through many comments that fluorescence would actually result in cloudiness.

Any advice on whether if this was a good piece? Any other stats that I need to look out for?

Hoping some friendly diamond enthusiasts would share their knowledge with me. Thank you!

Edit: I have attached 1 more diamond in 0.64c below.


upload_2018-12-5_0-20-37.png

upload_2018-12-5_0-27-57.png
 
Stone 1:
59 table, 60 depth, 34 crown, 40.6 pavilion & 80 LGF

This is basically what we call a 60/60 stone meaning the table and depth is both 60%. I know the table of this particular stone is off by just a smidge, but it will basically behave the same. The primary difference being this type of stone throws a lot of white light as opposed to rainbow light. We commonly associate rainbow light with the term "fire".

This is mainly due to the fact that the table is so large that the upper facets are reduced, which is where rainbow light is produced. Additionally the crown tends to be rather shallow as well.

These factors don't make it a bad stone, but it is very much a preference that people either like or dislike. You have to use a different set of proportions to find an ideal cut 60/60 stone.

These particular proportions nails the exact cut as Excellent (or EX) as shown on the chart below. However, you have to keep in mind the reported values on a GIA report are averaged and rounded. Consequently, not all values will be exactly 34 and 40.6; therefore, the blue box gives a more realistic window of what cut grade could be depending on the precision level of the cutting and this is just our best guess based on proportions only.

As you can see, that blue box encompasses Very Good (VG) all the way to Ideal. It's a wide range and to really know, you'd want an ASET, idealscope and hearts & arrow (H&A) image to confirm.

Unless you know about and like 60/60 stones I would suggest looking at some alternate stones personally.

Capture.PNG

Stone 2:
55 table, 62.7 depth, 36 crown, 40.6 pavilion and 80 LGF

This particular stone has a very different personality. The small 55 table will provide larger upper facets which will increase rainbow light, so the stone will show more fire. Also a steeper crown with complimentary lower pavilion will throw more fire as well. The problem here is the crown is really creeping on the high side. Also, this stone is cut too deep at 62.7%. You want to stay at 62.4 or less, and preferably <62.

I would not recommend or buy this stone without performance images to verify you don't have leakage in the stone.

Capture2.PNG
 
If you list your budget and expectations on color, clarity and cut we can help find a few alternate stones that will meet ideal cut parameters.

While I understand it takes a little time to digest this information, here is a very rough list of criteria to help you short list some stones:
  • 54-57 table
  • 60-62.4 depth (prefer <62)
  • 34-35 crown (maybe 35.5 with a 40.6 pavilion)
  • 40.6-40.9 pavilion (maybe 41 with a 34 crown)
  • 75-80 lower girdle facet (LGF) (many prefer 75 for fatter arrows & bolder flashes)
  • HCA score < 2 and prefer 1-2
  • Crown & pavilion angles must be complimentary meaning steep crown/shallow pavilion such as 35/40.6 combo or just the inverse such as 34/40.9 combo. Another quite dreamy combo is a 34.5/40.7 or 34.5/40.8.
  • AGS or GIA certified stones only (most prefer AGS 000)
Link to HCA tool (only good for GIA stones): https://www.pricescope.com/tools/hca
 
sledge said:
If you list your budget and expectations on color, clarity and cut we can help find a few alternate stones that will meet ideal cut parameters.

While I understand it takes a little time to digest this information, here is a very rough list of criteria to help you short list some stones:
  • 54-57 table
  • 60-62.4 depth (prefer <62)
  • 34-35 crown (maybe 35.5 with a 40.6 pavilion)
  • 40.6-40.9 pavilion (maybe 41 with a 34 crown)
  • 75-80 lower girdle facet (LGF) (many prefer 75 for fatter arrows & bolder flashes)
  • HCA score < 2 and prefer 1-2
  • Crown & pavilion angles must be complimentary meaning steep crown/shallow pavilion such as 35/40.6 combo or just the inverse such as 34/40.9 combo. Another quite dreamy combo is a 34.5/40.7 or 34.5/40.8.
  • AGS or GIA certified stones only (most prefer AGS 000)
Link to HCA tool (only good for GIA stones): https://www.pricescope.com/tools/hca
Click to expand...

Hi Sledge, thanks for the great advice.

I am actually looking at Color H and above, Clarity VS2 and above with excellent cut. The diamond is currently priced at 2k USD (converted from SGD). Do you think that would be worth its money?

Also, I have read up about the 60/60 diamond. Does it mean that the diamond will not shine as brilliant as non 60/60 diamond?

Thanks
 
IMHO, you really can't judge a 60/60 by the numbers. You need to have an ASET and or see with your eyes. Otherwise, agree with @sledge.

60/60 stones are characterized by being very brilliant and bright, they produce white flashes. Stones with more classic "PS" recommended numbers as @sledge noted, will have white light, but will fire off lots of little high-energy pinpoints (Fire). Different personalities.

Why don't you look at Jann-Paul? They are based in Singapore and you can see super-ideals (which have lots of fire).
 
rockysalamander said:
IMHO, you really can't judge a 60/60 by the numbers. You need to have an ASET and or see with your eyes. Otherwise, agree with @sledge.

60/60 stones are characterized by being very brilliant and bright, they produce white flashes. Stones with more classic "PS" recommended numbers as @sledge noted, will have white light, but will fire off lots of little high-energy pinpoints (Fire). Different personalities.

Why don't you look at Jann-Paul? They are based in Singapore and you can see super-ideals (which have lots of fire).
Click to expand...
Hi rocky, thanks for your input. I have tried Jann-Paul, but every diamond that I seeked advise for, the sales person insists that they only carry quality diamond. I don't doubt that, but it just doesnt feel right getting advise from a sales person, whom I feel may not be 100% honest or may show signs of biasness.

Thank you
 
TCKM12345 said:
Hi rocky, thanks for your input. I have tried Jann-Paul, but every diamond that I seeked advise for, the sales person insists that they only carry quality diamond. I don't doubt that, but it just doesnt feel right getting advise from a sales person, whom I feel may not be 100% honest or may show signs of biasness.

Thank you
Click to expand...
JP have a strong focus on 'SuperIdeal' diamonds, as I understand it, which should mean that they perform very well - I think you would be fine to buy from them.

Were the two stones listed above recommended by them?

You can ask for the GIA or AGS grading report numbers of any stones that are being recommended and then post them here for consideration, as you have already done :)
 
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