The average size for the US couple is one carat, while most European couples stay around 0.5-0.6 carat. Those in the Mid-Atlantic region will spend nearly $2,000 more than couples in the Midwest. Younger couples tend to choose between one and two carat diamonds, while older couples seem to opt for the higher end.

Kourtney Kardashian's engagement ring is one of the most talked-about pieces of jewellery in recent times. Designed by celebrity jeweller Lorraine Schwartz, the ring features a massive oval-cut mined diamond estimated to be around 10–12 carats set on a delicate pave-set band with a hidden halo.

Typically the average carat for a diamond engagement ring is anywhere from 0.5 carats to 1 carat. The price of a diamond ring somewhere between these sizes can vary dramatically according to the specifications you select.

Specifically, a high-quality 13-carat cushion cut diamond. And not just any cushion cut — this is the elongated style rather than the square. This way, the diamonds would show off Kim's long fingers.