Coloured Gemstone Rendering

[VG]

Hi Everyone,

I am rendering different kind of coloured gemstones and would like to have an original and natural look to the gemstones without much fire coming out of gem. I tried to render a ruby ring and using different material properties ended up as shown in first picture. Something that I am looking for is shown in two other pics of ruby and sapphire ring where the stones have not that much light and fire coming out of them. Can someone suggest me the possible way to adjust the light coming out of gemstone.

Thanks in advance,

Vihan