Hi Suzanne
A pleasure to be of assistance
Other's in the forum have helped me over the years , so I'm just returning the favour.

Here are some basic gemstones , you can import them into your drawing and rescale them to whichever size you need, array them around a curve etc


http://moi3d.com/forum/messages.php?webtag=MOI&msg=4423.4&highlight=yes

regards
shayne