I Created This Render in Blender And this Reference is From Tifny. I render Metal Saparatly and Stone Saparalty. I want same result just like the reference. Blender FIle is also Attached. The Main goal is to achieve same stome colours.
your link says, must ask for access.
I don’t have your file but it looks like your file has a blue world hue, whereas their rendering looks like it has white panels in black space. So the reflections suggest.
Also, your light size could be bigger in order to get a blurrier shadow. The tiff shot looks like the shadow might be 2d; ie., added in post. The falloff under the stone suggests so.
https://we.tl/t-A1z3jLP8Mf This is the new link for File
https://we.tl/t-A1z3jLP8Mf this is the new link for file. I am note using world enviromnet. I just add a lue light to get that type of blue reflection.
no good on the link. Won’t check anymore links you post. This link looks dubious: mailchimp…?
Yes, the blue is what I was speaking of. Try to use a grey color or so. Or a large white panel.
If you look at the reflections on both metal rings, you can easily see something you did different.
In the original, the sky that’s being reflected is black. Yours is gray.
The original metal ring also looks like it has a smoother curve, yours is more angular.
Or do you mean the diamond is what matters? It looks to me like your diamond might be rendered with more glossy bounces. In other words, your render has better quality and is a more realistic diamond than the original. Try reducing the glossy bounces in the render settings.
If this is a comparison of the results made by blender, you can find a way to produce the same results.
However, if it’s not a comparison of the results of the blender, it could be a difference in the rendering engine. 
As far as I know, the Cycles of the blender is not a very physically accurate rendering.
Luxcorerender, which is free to use and integrates well with blender
You can also get similar results with (luxorerender is physically more accurate)
This rendering engine is limited to the version supported by the blender and has a slow rendering speed.
Keep any view transforms in mind.
The blue hue might be a result of color management.
ok i’ll try this engine