Punched in the numbers and it show me this graph. Totally now idea how a good diamond should look like

Can you advice what is the ideal proportions? And how does these two thing affect the diamond

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Didn't notice replying to a 6 year old post

This post has been edited by BelaCHAN: Mar 19 2023, 01:19 AM

the green dot should be in between the red and blue line.

This post has been edited by entaro: Mar 19 2023, 02:14 AM

it will affect brilliance , sparkle and fire of a diamond. if you go a few pages back, there's a table, you can refer to that.

I don't recommend anything that is less than bright or firey balanced , tolkowsky all round is the best proposition but priced premium

Basically don't buy diamonds with most arrows blurred out.



Buy diamonds that look like this:



Proportions wise, try not to go beyond 41.2 for pavilion angle for round brilliant, better chance on landing good diamonds.

For the clear arrows sample above, I use 56% table, 34.5 crown angle, and 40.8 pavilion angle. the crown angle and pavilion angle pairing is closest to the famous Tolkowsky proportions.

This post has been edited by kambingkoh: Mar 19 2023, 02:45 AM

What about this ?

Better... 34 to 35.5 crown angle may be better though

Can compromise on the crown angle ? I mean does that affect a lot ? What do you suggest ?

As long as the arrows are clear enough... no problem.

Using the values from the newer diamond provided, the diamonds show in diamond screener shows decent arrows:



As for your question, "can we compromise?" - just leave the crown angle aside and look for a diamond that exhibits clear arrows, that will probably affect the most in terms of performance.

Here is a similar diamond from ZCOVA:
https://zcova.com/mined-diamond/selected-di...6?start=diamond

It is not the best, but I think it looks alright.

Anyway, for now, if possible, I will still ask for a few more options, and then only make a decision again.

On a side note, have you consider Lab-Grown diamonds? They are cheaper and is a good alternative. They are basically real diamonds, just grow in lab. If interested, look for diamonds that are grown via HPHT method, and remarks on the cert should be "As Grown". This can usually be seen on an IGI cert.

This post has been edited by kambingkoh: Mar 19 2023, 04:01 PM

Not sure about lab-grown, worth to buy ?

Price from the Zcova is about 2,000 more than the one I shown.

Option 1: RM 9800

Option 2: RM 10,900


Out of these 2, which one is more preferable ?

This post has been edited by quanonly90: Mar 19 2023, 04:09 PM

Any pictures for the 2nd diamond?

definitely 2nd diamond !

prefer this one, proportion and contrast better

Thank you for the inputs. Much appreciated.

Given the size of 0.73 , setting will be classic solitaire 6prongs tapered, non cathedral. Is this ok ?

the settings depend on usage, if you wear it daily preferably with cathedral support or hidden setting. if it's worn once in a while then you won't go wrong with classic solitaire whether 4 or 6 prongs, most importantly is your other half preference.

Best is this, get a loaner or temporary setting, then after successful proposal or as a gift, then bring your partner to the showroom for her to select settings.

btw, you asked about lab grown , it is value for money but no resell value , for 5k you can get a very nice 1carat diamond. It's still a diamond, just not mined and thousand of years old lol

Good luck bro!

This post has been edited by entaro: Mar 19 2023, 07:47 PM

I think it is up to your own preference.

Thanks for the information. Good learning. i am focusing to look at this spec
Table 55-58%
Crown angle 34-36
Pavillion angle 40.6-40.8

Plus i learnt i need to look at the arrow with naked eye. If blur then move on.

agreed to use loan or temporary setting , less headache. lol

as for mined diamond, will there still be resell value if it is installed in a setting ?

This post has been edited by jasperng: Mar 21 2023, 06:11 PM

The guide says
"The best cut diamonds will sit in the intersection between GIA Excellent and AGS Ideal."

Does it mean the green dot should be at the crossing point of red and blue line ?

I tried

Spec 1 Table 36 Crown angle 34.5 Pavillion angle 40.8 - Green dot in the middle of red and blue line area.


Spec 2 Table 36 Crown angle 34.5 Pavillion angle 40.6 - Green dot is at the crossing of red and blue line.


Which one is the ideal one ? Spec 2 ?

it seems to me 40.6 pic looks clearer.


another spec which i can see green dot at the crossing of Blue and red line will be Table 56 Crown 36 Pavillion 40.6

i tried changing the table % it appears the position green dot remain just the shape of red and blue line changes. does the shape of the red and blue line matter ?

This post has been edited by jasperng: Mar 21 2023, 05:13 PM