Aquamarine is a cool blue-grey-green, and the trick with it is to keep everything around it clean rather than warm. The moment you put a creamy, yellow-based white next to it, the blue goes muddy and the whole thing looks tired. So your woodwork wants a chalky off-white with a cool-to-neutral undertone.
For that job, Paper III from Paper & Paper Library (LRV 75.3) is a cracking pick — soft, paper-pale and just warm enough to feel liveable without dragging yellow into the blue. Au Lait by Farrow & Ball (LRV 80) is the other safe bet: a milky off-white that reads clean against Aquamarine and brightens a north-facing room nicely. Either makes a good ceiling and trim partner.
Underfoot and on larger surfaces, think pale stone, polished nickel hardware rather than brass, and natural linen. That cool metal finish matters — brass fights the blue, nickel sits with it.
Now, Aquamarine on its own can drift towards cold, so you want one grounding accent. Cigar BH.20 by Mylands (LRV 11.8) is the move here — a deep, leathery brown-red that warms the scheme and gives the eye somewhere to land. Use it sparingly: a piece of joinery, a leather chair, a door. It stops the room feeling like a swimming pool.
If you fancy something braver, Fuchsia Falls 2 by Dulux (LRV 29.8) is a punchy pink that plays the classic blue-green-with-pink card — think soft furnishings, a rug, artwork rather than full walls. It's the unexpected note that makes a scheme feel considered rather than safe.
Practical advice: test Aquamarine on more than one wall, because in cool north light it leans more grey and in warmer south light the green lifts. Get the white right first — paint your chosen off-white right alongside it and live with both for a couple of days before you commit. Sort that pairing and the rest falls into place.