Teaching Routines / Diamond Nine
Diamond Nine
Nine cards, arranged into a diamond — one at the top, then two, three, two, one. The top and bottom are easy and take a minute. The middle is where the entire activity actually lives.
A timer for each stage, with what the children do in each · free to try · no sign-up
The sheet it prints — optional
What is a Diamond Nine?
A Diamond Nine is a ranking activity in which a group arranges nine cards into a diamond shape — one most important card at the top, then a row of two, a row of three, a row of two, and one least important at the bottom. It is used across the curriculum wherever things can be ordered by importance, impact or usefulness.
The shape is doing the work. Ask a group to rank nine things in a list and they will produce something nobody argued about; the diamond has exactly one top slot and one bottom slot, so two cards cannot both win.
How do you run a Diamond Nine, step by step?
- Top and bottom (about three minutes). Agree the single most important card and the single least. Groups do this fast, and it gives them an early sense that they can agree on something.
- Fill the middle (about five minutes). The rows of two and three. This is where the disagreement is, and where you should be listening.
- Defend one (about three minutes). Each group picks one card and justifies its position to the class. Not the whole diamond — one card, properly.
Eleven minutes. The single most useful instruction you can add is that the middle row of three is deliberately unranked within itself, so they can stop arguing about the order inside it.
What makes a good set of nine cards?
Nine items that are genuinely comparable and not obviously ordered. If two cards are clearly the top and bottom to everybody, you have a seven-card activity with decoration.
Some that work: nine causes of an event, nine features of a good explanation, nine things a survivor would need, nine ways to spend a school budget, nine qualities of a leader. Blank cards are worth including — letting a group replace one card with their own is the fastest way to see whether they have understood the criteria.
Two things I would tell anybody starting. First, laminate them or you will cut out nine cards per group every single time and never run it twice. Second, and this is the one that changed the activity for me: make them physically place the cards before they are allowed to write anything down. I used to hand out a printed diamond template with boxes and they filled it in like a worksheet, quietly, with the loudest child dictating. Loose cards on a table produce an argument, because anybody can reach across and move one — and moving a card is a much lower-stakes way to disagree than saying “I think you are wrong”. The recording sheet on this page is for afterwards. With Year 4 I also take a photo of each diamond before they tidy up, because the arrangement is the evidence and it vanishes the moment the bell goes.
What usually goes wrong with a Diamond Nine?
- It becomes a worksheet. If they write before they move cards, one child decides and the rest copy.
- They argue about the order within the middle row. Say up front that the row of three is unranked inside itself.
- The cards are not comparable, so the ranking is arbitrary and the discussion is thin.
- The reporting stage drags because each group explains all nine. One card each is plenty.
Which year groups is a Diamond Nine for?
| Year group | US grade | What to change | How long |
|---|---|---|---|
| Years 2–3 | Grades 1–2 | Use six cards in a 1–2–2–1 shape, with pictures on them. | 8 min |
| Years 4–5 | Grades 3–4 | Full nine. Include one blank card they can write themselves. | 11 min |
| Year 6 and up | Grades 5–8 | Give two groups different criteria for “important” and compare the diamonds. | 15 min |
Diamond Nine compared with the other ranking structures
- Snowball also forces things to be dropped, but the ideas are the children's own rather than a fixed set.
- Silent Card Sort uses cards too, but groups them by category instead of ranking them — and it is done in silence.
- Placemat is the one to use when you want every child's independent answer preserved before any negotiating starts.
Free to try · no sign-up · the sheet is optional
Written by a practising primary school teacher, and part of the free-to-try Teaching Routines set on Sage Teachers. Last checked August 2026. Everything here is free to try.