The diamond (or gemstone) is the most significant part of your budget. Understanding the helps you prioritize where to spend: 10 Tips for Buying a Diamond Engagement Ring - GIA 4Cs

If your partner works with their hands or has an active lifestyle, consider a bezel setting or a low-profile design to prevent the stone from catching on things. 2. The Stone: Mastering the 4Cs

Before looking at diamonds, you need to know the wearer's aesthetic.

Borrow a ring they wear on their ring finger and have it measured by a jeweler, or trace the inside of it on paper. You can also ask a close friend or family member who might already know.