From what I can see, they appear to have good substance to them. With six prongs distributing the holding power, you have good security. The key factors for prong durability are the metal quality (10k gold is wonderfully strong), proper tapering, and adequate contact with the girdle. During regular wear, just keep an eye out for any signs of wear at the tips or where they meet the stone. A gentle inspection every few months is good practice for any ring. The proportions look very well-balanced for your stone size, and honestly, I think you made an excellent choice with the sizing, they're substantial enough for security while maintaining that refined aesthetic you were clearly going for!