What an old European cut is, how it differs from a modern round, and what really drives the value of a 1 carat stone.

A plain-English guide to 3 carat emerald cut diamond prices in the UK, lab-grown versus natural, and what really drives the cost.

A 1 carat emerald cut has three different values: purchase price, insurance value and resale. Here are all three, honestly.

Marquise diamonds usually cost less per carat than round. Real UK prices, what a 1 carat marquise is worth, and how to buy one well.

Round diamonds cost the most per carat. Here is exactly why, what you get for the premium, and how to buy round without overpaying.

What half carat and 1 carat marquise diamonds are worth, why they cost less than rounds, and the bow tie flaw certificates never show.

Which diamond shapes cost least, which cost most, and what a 1 carat lab-grown diamond really works out at once it is set.

What moves the price of a solitaire, real UK prices from our own range, and whether solitaires really cost more than halo rings.