Hello,
good work i liked it, simple but gives the idea. I think we could use the light coming from inside the diamond and give it tones of fruit like if a fruit was coming out from it, may be you could use red, blue berry color, green as limes, orange like for papayas, and so on and put a touch of that ccolor light as if coming from the core the diamond but leaving like the outter part in white as it is,
good job we like it