Omega built this watch in exactly two colours, and put one of them on the strap.
Gold: the 41mm case, the smooth bezel, the crown, the clasp, and the facetted 18K yellow gold hands and indexes. Blue: the polished blue ceramic dial, laser-engraved with the Tokyo 2020 emblem pattern, and the integrated blue alligator strap Omega fitted it with. There is no third colour anywhere on the front of the watch. The gold sits in the middle, with blue on both sides of it.
That's an unusually clean brief for a strap, because it makes the position explicit: the strap is one half of a two-colour design, and it's the half you're allowed to change.
The size: 20mm
This takes a 20mm strap. Published specifications for this exact reference state a 20mm lug width, and it matches the Aqua Terra family rule we've now verified across a dozen guides in this collection.
The rule, worth carrying in your head: 38mm takes 19mm, 41 and 41.5 take 20mm, and 43 and 44 take 21mm. A 38mm version of this same Tokyo gold watch exists, and it is a 19mm watch — if you own that one, order accordingly.
Two practical notes. The lugs are Omega's short twisted lyre design, so a strap cut for the Aqua Terra case sits against them properly; a generic straight-ended 20mm strap will leave a visible gap at the case. And gold is soft — softer than steel by a wide margin — so keep the spring-bar tool square and work on a cloth.
Everything on this watch is permanent except the strap
Look at what it's made of. An 18K gold case. A ceramic dial — fired, not painted, so it will not fade or drift in twenty years. A domed sapphire crystal with anti-reflective treatment on both sides. A Master Chronometer calibre behind a sapphire caseback. Gold hands, gold indexes, gold clasp.
Every single one of those components was chosen to outlast the person wearing it.
And then there's the strap: alligator. A skin. On a watch rated to 150 metres, worn on a wrist, exposed to sweat and sunlight and everything else. It is the one consumable on an object where nothing else is consumable, and it is guaranteed to be the first thing that looks tired — probably by a decade or two.
That's the real argument here, and it isn't about taste. On this reference the strap isn't a styling choice you might revisit; it's the only component you will ever have to buy again. A rubber strap cut for the same case takes the wear instead, and keeps the alligator in the box looking as new as the gold does.
The best straps for the gold Aqua Terra Tokyo 2020
1. Full blue — keep Omega's two colours
The direct conclusion of everything above. A full blue rubber strap holds the design exactly as Omega drew it — blue below, blue above, gold between — in a material that doesn't age. Nothing about the watch changes except what happens to it over the next ten years. If you like this watch as it left the boutique, this is how you keep it that way and still wear it.
2. Full black — let the gold be the only warm thing
The jeweller's answer, and there's a reason jewellers use dark trays. A black rubber strap removes the second colour entirely, which leaves the gold as the sole warm element against a dark ground and a blue dial. The case reads richer, the facetted hands catch more, and the whole watch drops a register from celebratory to serious. The most wearable option here by some distance.
3. Blue with a white line — sharpen the edge
Gold on blue is a soft pairing at arm's length; both are mid-tones and neither draws a hard line. A blue strap with a white line keeps Omega's colour scheme but adds the one thing it lacks — a crisp bright edge running the length of the strap, which gives the eye something to follow and stops a gold-and-blue watch reading as one warm blur across a room.
4. Light blue — make the gold warmest
The summer option and the most flattering to the metal. Gold looks warmest against a pale, cool tone — it's the same effect that makes gold jewellery look richest on a light background. A light blue rubber strap lightens everything below the case and pushes the yellow gold as far towards warm as it will go, while staying inside the watch's own colour family. It's the version that photographs best and the one that makes a gold sports watch feel unserious in the right way.
The short version
20mm — and 19mm if yours is the 38mm. Full blue to keep Omega's two colours, black to make the gold the only warm thing, blue and white to sharpen the edge, light blue to warm the gold as far as it goes.
Every strap in our Aqua Terra collection is cut for this case and carries a lifetime warranty on rubber — with free worldwide shipping and no import costs, part of why more than 50,000 customers have trusted us with their watches. Guides to every other Omega we've covered live in the Omega strap guide hub. Two colours, and you own one of them.
