Argyle Australian Champagne Diamond — 1.00ct Round Brilliant Cut| C4 - Medium Champagne

Why we chose this stone

Hitting exactly one carat, this round brilliant carries a C4 grade — the colour most people picture when they hear "champagne diamond," neither pale nor heavy, just a clean, confident gold. The brilliant cut's dense facet arrangement is built to maximise brightness and movement, and at this weight, there's ample surface for the colour to travel across as the stone catches light from different angles, alternating between warmer and lighter tones rather than settling into one flat hue. A full carat is always a meaningful threshold for a centre stone, and reaching it with a solid, recognisable champagne tone makes this one an easy diamond to picture in almost any classic setting. It comes from the East Kimberley region of Western Australia, mined before the Argyle pipe's closure ended production of these diamonds permanently.

There's something fitting about a round number paired with the most iconic of the champagne grades — this is the stone most buyers have in mind when they first go looking for an Argyle champagne diamond. With the mine closed, a genuine one carat C4 in round brilliant is a combination that won't be easy to source again once it's gone.