If you are currently on or lower: Yes. The 519 New build is essential. The Boolean speed and symmetry tools will pay for the upgrade in two jobs.
Older versions required you to manually cut seats for round stones on curved surfaces. Version 5.19 allows you to select a stone, select a curved surface (like a bangle or a tapered shoulder), and the tool automatically:
If you are doing high-end custom engagement rings with complex filigree, MatrixGold is still superior. But if you manufacture 500+ standard catalog items per month, JewelCAD 519 New is faster by a factor of 10.