Improving for jewel design

Hi, hallo to everyone!
I’m new here and I’m trying to use Blender to model Jewelry. Is there a way to take precise measurements like in Rhinoceros? For example: setting a lot of stones at a same distance from each other? The other question is: is that possible to have the total gold weight (that is also different between 9kt, 14 kt, 18kt and 24kt) of the jewel like in Rhinoceros?
If these features are not available, I think that it would be very useful to introduce them. And it also could launch Blender as a real Rhinoceros competitor. This field is very interesting and offers an awful lot of opportunities. I hope the development team will read this topic and think about that.
Thank you very much!