Decide a comfortable number first—it focuses every choice that follows. Lab-grown diamonds stretch a budget remarkably, so expect a larger, higher-grade stone than a mined equivalent at the same price.

Cut drives sparkle more than any other factor. Always choose Excellent / Ideal—it’s what makes a diamond come alive. Learn more in the 4Cs guide.

Pick the silhouette that suits the wearer's style and hand. Compare all ten shapes.

Aim for near-colourless (G–H) and eye-clean (VS–SI). These grades look flawless to the naked eye at a fraction of the price of the very top of the scale.

Buy just under the “magic” weights—for example 1.9ct instead of 2.0ct—for a near-identical look on the finger and a real saving.

Solitaire, pavé or halo; platinum, white, yellow or rose gold. The setting shapes the entire look—and the right one can make your centre stone appear even larger.

Only ever buy a diamond with an independent IGI or GIA report. Here’s what to look for.