Determining how much an engagement ring should cost depends on a variety of personal factors, including your budget, financial situation, and preferences. Traditionally, the guideline has been to spend about two to three months' salary, but this is a dated standard and not a hard and fast rule. The most important aspect is to choose a ring that you can comfortably afford and that reflects your relationship's unique values and sentiments. Focus on finding a balance between your budget and what will make your partner happy, rather than adhering to traditional benchmarks.