Most people have heard of it. Some people believe it. A few feel guilty for not following it.
The rule says you should spend three months of your salary on an engagement ring. Some versions say two months. Some say one. The number changes depending on who you ask.
Here is the truth: it was invented by a diamond company to sell more diamonds.
Where It Actually Came From
The story starts in the 1930s during the Great Depression. De Beers, the diamond giant, controlled around 60% of the world's diamond supply. And nobody was buying.
So they hired an advertising agency. The agency did something clever. They linked diamonds to love and commitment for the first time in history. Before that, diamonds were just stones. After that campaign, a diamond was proof that you cared.
Diamond sales jumped 50%.
The original rule was one month's salary. That was the 1930s message. Spend one month. It worked.
Then in the 1980s, De Beers updated the campaign. Now it was two months. Sales responded again.
Eventually it crept up to three months. By that point, the idea had been around so long that it felt like tradition. Like something your grandfather followed and his grandfather before him.
It wasn't tradition. It was advertising.
Why People Still Follow It
The rule has lasted because it feels like a social norm. Nobody wants to look cheap in front of their partner or their partner's family. If there's a number floating around that sounds official, it's tempting to use it as a guide.
The other reason is that buying a ring is genuinely confusing. There are so many choices. Having a rule, even a made-up one, feels easier than starting from scratch.
But following it can lead people into real financial trouble. Going into debt or wiping out savings to hit an arbitrary number is not a romantic gesture. It's a stressful way to start a life together.
What to Actually Spend
There is no correct number. That sounds like a cop-out, but it's true.
The right amount to spend is whatever makes sense for where you both are in life right now. That means thinking about your income, your savings, your rent or mortgage, any existing debt, and what else you might need that money for in the next year or two.
Some couples are in a position to spend more. Some aren't. Neither situation says anything about how much you love the person you're marrying.
A ring is a symbol. The symbol works whether the stone cost five hundred dollars or five thousand. Your partner is wearing it every day because of what it means, not because of what it cost.
The Lab-Grown Diamond Factor
One thing worth knowing is that lab-grown diamonds have changed what your budget can actually buy you.
A lab-grown diamond is physically identical to a mined diamond. Same hardness. Same sparkle. Same chemical structure. But they cost significantly less, often 70 to 80 percent less than an equivalent mined stone.
That means the budget you're comfortable with, whatever it is, goes a lot further than it would have even five years ago. You don't need to stretch beyond your means to get a beautiful ring. You just need to know where to look.
The Only Rule That Matters
Spend what makes sense for your situation. Pick a ring your partner will love. Start your marriage with your finances intact.
That's it. There's no other rule.
The three month salary rule was invented to sell diamonds. It did its job. It doesn't have to do anything for you.
View our full collection of beautiful lab-grown diamond engagement rings that are sure to get you excited!
Thanks for reading, Jared and Brie