This tool allow us to create prongs along a line of gems.
Jewellery > Prongs in Line
Select the gems.
Define the material.
Define the prongs profile.
Define the prongs measures.
Use the mouse to drag the prongs to the pretended place, it will create a mirror to place the prongs in the other side of the gem. If we press the Shift key it will apply the changes to all the prongs.
Press the checkbox to add the prongs to the document.