How can obtain these jewels?

[Piflik]

You could start by giving more information on what you have and where it fails. 'It doesn't work' is not a adequate problem-description.

You should post an image of what you have so far and your render and material settings.

[SUEPAHFLY]

http://img84.imageshack.us/img84/7517/anelli.jpg

i've done this with maxwell render
i didn't used hdri image, only two emitters
one on the top of scene and one on the right.

anyway also using hdri I never got any satisfactory result

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