How much should you spend on an engagement ring?

The Knot's 2026 Real Weddings Study, reported in Rapaport, put the average laboratory-grown engagement ring at $4,300, with an average centre stone size of 2 carats and oval as the most popular shape¹.

Those are averages across all buyers, including people who spent much more. The actual distribution is wide: a 2 carat lab stone starts from $755 at Friendly Diamonds on October 7, 2026, and a stone plus a plain setting can cost under $1,200⁴. The $4,300 average includes people who chose platinum settings, higher grades or branded jewelers.

The rule - spend two or three months of your salary on a ring - originated in advertising, not in financial advice. De Beers ran a campaign in the early 1980s with the slogan "Is two months' salary too much to spend for something that lasts forever?" The BBC traced this in a 2013 investigation². The same playbook had already run in Japan with one month's salary².

Brilliant Earth's own guide confirms the origin: the guideline was created by a diamond company's marketing campaign³.

No consumer finance authority, bank or government regulator has endorsed the rule. It is a guideline invented to sell more expensive rings, then repeated until it felt like a tradition.

Start with origin. A natural 1 ct round near the Brilliant Earth median was $4,750 in the listings we read on October 2, 2026. A lab-grown 1 ct round was $388 to $475 at the same weight⁵⁶. Origin is the largest single price lever.

Set a ring budget, not just a stone budget. A plain solitaire setting adds $430 to $935 at the jewelers we read. Stone plus setting determines the actual spend. See setting prices.

Match to financial reality. Consumer finance resources such as American Express and Citizens Bank suggest spending what you can pay cash for without taking on consumer debt. A ring bought on a high-interest card is a more expensive ring than its sticker price.

Lab-grown prices are falling. Wholesale prices for lab-grown diamonds fell 13% year-over-year in Q2 2026⁷. Retail follows. The ring you buy for $1,200 today may sell for far less if you ever try to resell it⁸.

Resale. Lab-grown diamonds resell for 10 to 30% of purchase price, industry estimates show⁸. Even if a jeweler offers a trade-in credit of 100% of what you paid, you must spend double on the next purchase to use it (that is Friendly Diamonds' policy [see their exchange page]). Natural diamonds also resell at a fraction of retail. Buy a ring because you want it as a ring, not as an investment.

Falling prices. Wholesale lab-grown prices fell 13% year-over-year in Q2 2026⁷. A ring that costs $1,200 today may be worth even less used. A 30-day return window lets you return the stone, but it is not price protection after delivery.