My choice is:

1. GIA 3
Comment: Among the 3, this can be the best choice for now. But don't really prefer the steep crown at 35.5.

2. GIA 1
Comment: This is cut til slightly deep, at 62.6% depth.

3. GIA 2
Comment: Don't prefer SI2. Clarity is too low. Unless can proven to be eye-clean by seller and the price is right, it can be the best choice.

Most importantly, check the price and get the images.

Are the diamonds preset in the ring settings? If no, then you can take a look at the Hearts and Arrows image. For other images like ASET and IdealScope, I doubt they will provide, but you can try to ask.

Don't worry about colour blind if you are looking at Hearts & Arrows, the main purpose is to see how symmetrical the diamond is.

For the arrows, you can always look from the top of the diamond.

For the hearts, you can always look from the bottom of the diamond. I think you can see a lot of differences here between a normal diamond and a super ideal cut diamond.

Anyway, since you mentioned that this is only loose stone, what is the price for their ring settings?

Did you see from the bottom of the diamond? How the hearts look like?
As for your VS2, is it exluding VS2 or including?

Mosy importantly, you have seen the diamonds, how do you feel about each invidiual diamond?

HCA is just a reference tool to reject stone that fall below a certain value. By standard practice, we are advised to filter out diamonds that score 2 and above. The higher the score, the more you should avoid the diamond. The general rule is to focus on diamonds that has a score that falls below 2.0.

Ok, let's take a look at the options you provided:
GIA 1: https://www.gia.edu/cs/Satellite?reportno=6...d=1355954554547

HCA:
Light Return: Very Good
Fire: Very Good
Scintillation: Very Good
Spread: Very Good
Score: 2.7 - Very Good - Worth buying if the price is right
GIA 2: https://www.gia.edu/cs/Satellite?reportno=2...d=1355954554547

HCA:
Light Return: Very Good
Fire: Very Good
Scintillation: Very Good
Spread: Very Good
Score: 2.7 - Very Good - Worth buying if the price is right
GIA 3: https://www.gia.edu/cs/Satellite?reportno=1...d=1355954554547

HCA:
Light Return: Very Good
Fire: Very Good
Scintillation: Very Good
Spread: Very Good
Score: 2.3 - Very Good - Worth buying if the price is right
Ok, let's take a look at some of the best diamonds you can buy at WhiteFlash:

Here you can take a look at some of the best diamonds around, with all the images for your reference:
0.523 ct D VVS2 A CUT ABOVE® Hearts and Arrows Diamond
http://www.whiteflash.com/loose-diamonds/r...id=myengringexp (affiliate link)
The money is on the high side for this one to be honest at USD 2777, with discount of USD 25 for new purchaser, the final price will be USD 2752. Include GST will be around a whopping RM 13,185.38. Together with a setting from Memory Jewellery, or any other jeweller in Malaysia, the final price can be around RM 14,185.38 - RM 15,185.38.

HCA:
Light Return: Excellent
Fire: Excellent
Scintillation: Excellent
Spread: Very Good
Score: 1.4 - Excellent within TIC  range

Here you can take a look at some more affordable option:
0.54 ct D VS2 A CUT ABOVE® Hearts and Arrows Diamond
http://www.whiteflash.com/loose-diamonds/r...id=myengringexp (affiliate link)
The price for this diamond is USD 2593, with discount of USD 25 for new purchaser, the final price will be USD 2568. Include GST will be around RM 12,303.80. The final price with simple solitaire setting will be around RM 13,303.80 -  RM 14,303.80. The performance of this diamond is great and the hearts and arrows are not bad in comparison to some other 0.5x WhiteFlash ACAs. The only downside for this diamond is probably the feather and the needle around the edge. But at VS2, it should be relatively safe. Looking at the price, I would probably top-up the difference and go for the smaller VVS2 above.

HCA:
Light Return: Excellent
Fire: Excellent
Scintillation: Excellent
Spread: Very Good
Score: 1.5 - Excellent within TIC range

After taking sometime to take a look, I think this is the one I will probably buy myself:
0.516 ct E VS1 A CUT ABOVE® Hearts and Arrows Diamond
http://www.whiteflash.com/loose-diamonds/r...id=myengringexp (affiliate link)
The hearts and arrows look great and the light return is great. For this diamond, I have also checked the AGA/NAGA Cut Class Grader. The score is 1A, as expected. Just that the girdle score 1B, because of Thin to Slightly Thick, but I won't really mind this because the images give me enough confidence. The price is USD 2479, with discount of USD 25 for new purchaser, the final price will be USD 2454. Include GST will be around RM 11,757.60. The final price with simple solitaire setting will be around RM 12,757.60 -  RM 13,757.60.

HCA:
Light Return: Excellent
Fire: Excellent
Scintillation: Excellent
Spread: Very Good
Score: 1.3 - Excellent within TIC  range

Not many people can accept G colour cuz this is where the yellowish tint start to be discernible to the naked eye. But as you can see from the images below, the slight yellowish tint can only be seen if you view the diamond from the side. If your diamond is an ideal cut, you can't really differentiate from the top view because its sparkle and fire will mask its body colour very well.





Left: 0.57 G VS1. Right: 0.54 E VS1. Both are Octagon H&A.

So people will usually go for G colour diamonds to maximise their carat weight.

Magic number 0.5 there bro. Imagine this:

Boy: Would you marry me?
Girl: Yes but before that, the diamond how many carat?
Boy: Not big, 0.4x je.
Girl: HAHH??? Add a bit more become 0.5 also cannot ahh?? So damn insincere.
Boy: *Shit! Should have thought of this...*

Radiance? Since you are at Bangsar, do drop by DeGem and check their GIA out as well. It is literally just down the road. You can also pay Suen (formerly known as Carat Club) which is facing the opposite street as well. Then, go to MV and visit all those diamond shops there!

wow bro. got some stones eh? hehe

The psychological effect is there bro, even though it is only less than 0.1 carat to 0.5. More so when your future wife compares her diamond with those of her friends. Imagine this:

Future wife: My dear dear just bought me a proposal ring. See!
Friend 1: Wah, very bling wohh!!! Want blind liao.
FW: Ya lohh ya lohh. Dear dear say this one triple excellent cut lehh!
F1: Ya ahh, how big??
FW: 0.4x carat.
F2: 0.4x only mehh? Propose must have at least 0.5 lahh. A bit more also cannot top up ahh your dear dear?
FW: *Go back he sure kena!*



-add-

I am telling this based on my experience. One of my friends proposed to his future wife with a 0.96 carat princess cut diamond cuz he was thinking of buying shy to safe some bucks and maximise cut. His proposal turned out great, make no mistake about that. But a few months after that when she started to show off her stone to her friends, the nagging began. Haha.

His girlfie did not know anything about the 4Cs. All she knew was the bigger the better. That's why.

True, but if it can make your SO super happy then why not?

Hi, I'm going to buy a proposal ring for my girlfriend.

Of course, Tiffany & co first came to mind 'cos all girls want Tiffany..

Can I know around how much is the price for their classic Tiffany Setting for 0.25~0.35 carat?

Inb4 comments of "just go their shop ask".
I know I know, but I'm not in KL to just walk in and check the price. I just want to know around how much first to see if I can stomach their price point...

Did they quote you any price?

Yes, fluorescence is a turn-down. Is that the diamond that you shared the GIA number here before?

It will only look bluish under UV ray. At least that's what I read online.

What is the pavilion angle and the crown angle of the diamond she offer you?

Aiyah, help me see see mah. So that I know what is the price range like

Fluorescence on a diamond is not necessarily bad. As long as the stone does not appear hazy/murky/milky/smoky under normal lighting then should be fine. Fluorescent diamonds are priced lower depending on the type of fluorescence. Of course, as with girdle thickness, avoid the extremity.

You should consider if the diamond has faint or medium fluorescence.

Bro, you sure this is the one?

This is a slightly shallow cut diamond. Its crown is a bit small and its table is large. Most of the light entering the stone will leak through the table and crown, which will form a "ring of death" under the ASET scope. That's why its HCA light return grade is very good instead of excellent.

See below:



This diamond is a 0.73 E VS2 which I previously viewed at JannPaul. The salesperson told me upfront that it is a shallow cut. Note the white ring of death.

Cool bro. Congrats on your purchase!