The short answer: a trillion cut diamond looks best in settings that protect its three corners and echo its triangular outline, such as a three stone ring with trillions on the sides, a bezel, a halo or a modern solitaire with corner claws. Choose by how bold you want the look to be and how active your hands are.
The trillion is a triangular diamond with curved or straight sides. It is distinctive and graphic, and it is often used as a side stone beside a central diamond. It can also stand alone as a centre stone for someone who wants something unusual.
Curved or straight sides
Some trillions have gently curved sides and rounded corners, which feel softer and are slightly more forgiving. Others have straight sides and sharp points, which look crisper and more modern. The setting needs to suit the shape. Rounded corners can be held by standard claws, and sharp points need corner claws or a bezel.
The best settings for a trillion
| Setting | Look | Why it works |
|---|---|---|
| Three stone with trillion sides | Classic and balanced | Trillions flank a round, oval or cushion centre |
| Solitaire with corner claws | Graphic and modern | Protects the three points |
| Bezel | Sleek and secure | Covers every edge |
| Halo | Glamorous | Frames the triangle and adds sparkle |
| Tension style | Contemporary | Holds the stone with a seamless band |
Trillion as a side stone
Trillion side stones are popular because they lead the eye towards the centre diamond and add extra sparkle at the sides. They suit round, oval, cushion and emerald cut centres. If you are choosing a three stone ring, we can match the colour and clarity of the side stones to the centre. See our guide to setting types.
Trillion as a centre stone
A trillion centre stone is a bold choice. Pointing the triangle upwards or downwards changes the look. Set point up, it feels architectural. Set point down, it feels like a shield. Try each in a render.
Protecting the points
The three corners are the vulnerable parts of a trillion. A good setting covers each one. If you are not sure whether a design protects them, ask us to point them out on the render. The idea is the same as for any pointed stone, and our guide to protecting the corners of step cut stones explains it in more depth.
Colour and clarity
A trillion with a brilliant cut hides small marks well, and a step cut trillion shows more of the inside, so clarity matters more. Colour can show in the points, so some people choose a slightly higher grade. We can compare real stones with you.
Metals
Platinum and white gold look crisp. Yellow gold gives a warm, art deco feel. Rose gold adds a gentle, modern warmth.
Natural or lab grown
Both are real diamonds, and we label every stone clearly. Browse diamonds and lab grown colourless diamonds.
How to choose
- Decide whether the trillion is the centre or a side stone.
- Choose how the points are protected.
- Pick the metal.
- Approve the design in writing before anything is made.
Nothing is made until you approve the design in writing, and our standard making time is 5 to 6 weeks, which can vary with your location and how busy we are. See our diamond shapes guide. Pieces start from £600.
Frequently asked questions
Is a trillion a good centre stone? Yes, for someone who wants a bold, geometric look.
Do trillions chip easily? The points are vulnerable, so protect them with claws or a bezel.
Can I use trillions with a round centre? Yes, it is a classic three stone combination.
Does a trillion look large? It can look generous for its weight because of its wide footprint.