Hello, this diamond has an HCA score of 1.3 and its Enchanted Cut Score is 97.2. Overall, the cut of this diamond is acceptable. It should return relatively more fire because of its 35.5 degrees, but at the expense of some brilliance. Although I prefer a more balanced diamond, but I guess more fire is an acceptable trade-off. 62.3% depth is actually slightly deep, and I guess that's where this diamond loses score on Enchanted Cut Score, but then this is probably due to the medium - slightly thick girdle, and not due to steep crown or steep pavilion, so I would say it is fine. You will be getting a 18k white gold ring, I presume? And Halo Setting will come with side diamonds/melee diamonds, so for the ring setting, it is relatively more expensive than a normal simple 4-prongs/6-prongs solitaire.

Now, for RM 8k, I would say the price is fair, if based on proportions alone. I would not prefer SI1, unless you can see that it is eye-clean.

Alright, time to do my affiliate work =>

If you don't mind dropping the colour to F, you can probably get this:
https://www.whiteflash.com/loose-diamonds/r...id=myengringexp (affiliate link). Even with halo setting customized elsewhere, it will still be cheaper than 8K. And this diamond has images to back it up (which is important). Besides, it is even larger at 0.427ct.

There are no D colour diamonds, but if you want to get an E VS1 Black by Brian Gavin, it will costs you a couple of hundred ringgit - thousand ringgit more. You sacrifice on one grade of colour but you gain on 2 grades of clarity. And Black by Brian Gavin's performance is really top of the line, it is said to be the pinnacle of Brian Gavin's work.

Here are some prices for your to refer. WhiteFlash offers free worldwide shipping, while Brian Gavin does not (so you need to pay for shipping).
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Remember to add 6% GST to the loose diamond price. There will be some misc. charges but I will exclude it because it is minimal (< RM 50).

Remember, this is just for reference, and you will need more patient and footwork to get things done in comparison to buying a complete diamond ring. There is also some risk, but relatively low because they use Fedex for shipping.

Alright! That's all for now, hope everything goes well for you!