A Field Guide to Tortoiseshell

Tortoiseshell is the warm, mottled amber-and-brown pattern that has been the quiet backbone of good eyewear for the best part of a century. Once upon a rather grim time it was made from the shell of a real animal, though, as we'll get to, not the animal the name suggests. Today it's a pattern, beautifully layered into acetate, without a turtle in sight. Ours is premium deadstock acetate, so you get all of the depth and none of the guilt. It also happens to be the single most wearable thing you can put on your face, which is the part most people don't realise until they try it. Here's the history, lightly told, and then the bit that actually matters: how to wear it.

A little history (and a case of mistaken identity)

Let's clear up the name first, because it's a proper red herring. "Tortoiseshell" never came from tortoises. The original material was the shell of the hawksbill sea turtle, a marine turtle, not a land tortoise, whose mottled, translucent scutes happened to be the most beautiful thing a Victorian comb-maker had ever seen.

For centuries the real thing was carved into combs, boxes, eyeglasses and other small treasures. The trouble is that it was lovely enough to be a curse for the animal: the hawksbill was hunted so relentlessly that it's now listed as critically endangered by the IUCN, and one study estimates that something like nine million were taken over roughly 150 years to feed the trade. Not, by any measure, a charming origin story.

The happier turn came in the 1970s, when international trade in the material was banned under CITES, the global endangered-species convention. And here's the genuinely cheering bit: the spread of plastics is, in the words of one marine-conservation team, "a rare example of how the proliferation of plastics has actually benefited sea turtles" [1] because a frame that could be made convincingly (and far more cheaply) from acetate removed most of the reason to hunt the hawksbill sea turtle at all. The pattern everyone loved could finally be divorced from the creature it had cost.

Which is where modern tortoiseshell lives now: a look, not a material. Our frames are cut from premium acetate, layered to recreate that same warm, irregular depth, the richness without the remorse. If you want the full story on why we use the acetate we do, it's here.

Why tortoiseshell is the most wearable pattern there is

Here's the case for tortoiseshell over plain black, which is the choice most people default to and quietly regret by August.

Black is a full stop. It's sharp, it's safe, and against some complexions it can be a little severe, drawing a hard line across the face. Tortoiseshell does the opposite: it's a warm neutral, so it goes with absolutely everything in your wardrobe the way black does, but it brings a flattering warmth up to the face instead of draining it. It reads as considered rather than corporate. And because the pattern is irregular, it has a bit of life to it, no two stretches of the acetate are quite the same, so it never looks flat or plasticky in the way a block colour can.

It's also, frankly, the lazy person's power move (I say this with love, as one). It looks like you thought about it, even on the mornings you absolutely did not.

A couple of gentle pointers, rather than rules:

On undertone. Classic warm brown tortoiseshell is about as close to universally flattering as eyewear gets. If your skin has warm, golden undertones, the warmer amber and honey tortoises will sing on you. Cooler complexions tend to love the smokier, darker tortoiseshells with more contrast, still warm, just turned down a notch.

On wardrobe. Tortoiseshell sits especially happily next to creams, camels, denim, olive and white, your whole capsule-wardrobe palette, essentially. It's the rare accessory that works as well with a linen shirt on holiday as it does with a coat in February.

On the frame, not the pattern. This is the one people miss: tortoiseshell is a colour, so which face shape it suits depends entirely on the shape of the frame it's in, not the pattern itself. Our guide to choosing glasses for your face shape covers that properly, and the three frames below are a neat illustration of how differently the same pattern can behave.

Three ways to wear it

Same tortoiseshell, three completely different personalities.

1. Ciren — the soft one. A gently rounded oval, a softened take on the old shield-aviator, in glossy tortoiseshell with dark green lenses. The rounded shape is the forgiving, easy-to-wear option, and it's especially good at softening a more angular or square face, where curves balance out strong features. This is the throw-on-with-anything pair, the one that quietly makes you look like an off-duty It-girl while you're actually doing the food shop. See Ciren.
2. Acadia — the everyday hero. Oval too, but with a touch more edge, and a summery medium-blue lens that lifts it out of the expected. If you're the sort who buys one good version of everything and wears it to death (a noble calling), this is your tortoiseshell, it works with every occasion and every outfit, which is exactly what a capsule-wardrobe pair should do. See Acadia.
3. Farringdon — the sharp one. Now for contrast: an angular, rectangular frame with a chic diamond detail and dark brown lenses, made for the modern London it-girl who wants a quiet statement rather than a loud one. The structure here does the opposite job to Ciren, angular frames bring definition and balance to a rounder, softer face, and add a bit of architecture to any look. This is the pair that reads as deliberate. See Farringdon.

Between a soft oval, an everyday oval-with-edge and a sharp rectangle, you've got the whole spectrum of what tortoiseshell can do, proof that the pattern is only ever as quiet or as sharp as the shape you choose to put it in.

Looking after it

Acetate tortoiseshell is hard-wearing, but it likes the same care any good frame does: a wipe with a microfibre cloth rather than your shirt, and a proper case when it's not on your face, so the glossy finish stays glossy. We’ll be going into the full routine in our future guide to travelling with sunglasses without scratching them (so keep an eye out for this!), but the short version is: be a little kind to it and tortoiseshell ages beautifully.

Frequently asked questions

• Is tortoiseshell made from real turtles? Not any more. Historically, the material called tortoiseshell came from the shell of the hawksbill sea turtle, not from tortoises despite the name. International trade in it was banned under CITES in the 1970s, and ours is a pattern recreated in acetate, with no animal involved.
• Why is it called tortoiseshell if it came from a turtle? It's essentially a centuries-old misnomer. The prized shell came from the hawksbill sea turtle, a marine reptile, but the pattern became popularly known as "tortoiseshell," crediting the land tortoise instead. The name stuck even though the tortoise had nothing to do with it.
• Is tortoiseshell eyewear ethical? Our tortoiseshell eyewear is made from premium deadstock acetate, made from renewable cellulose (cotton/wood), making it highly flexible, hypoallergenic, and capable of holding rich, multi-layered colours, so no turtles or tortoises are harmed in making it. In fact the spread of acetate and alternative cheaper materials such as TR90 are widely credited with reducing demand for the real material and easing pressure on the hawksbill turtle.
• Does tortoiseshell suit everyone? It's about as close to universally flattering as eyewear gets, because it's a warm neutral that brings colour up to the face rather than draining it. Warmer, golden complexions tend to suit honey and amber tortoises; cooler complexions often prefer darker, smokier tortoiseshell with more contrast. There's a flattering version for almost everyone.
• What face shape does tortoiseshell suit? Tortoiseshell is a colour, not a shape, so the answer depends on the frame. Rounded and oval tortoiseshell frames (like Ciren or Acadia) soften angular and square faces, while angular, rectangular tortoiseshell frames (like Farringdon) add definition and balance to rounder, softer faces.
• Is tortoiseshell better than black for glasses? For many people, yes. Black is sharp and safe but can look severe against the skin, while tortoiseshell goes with the same everything-in-your-wardrobe range and adds warmth to the face. Its irregular pattern also gives it more depth and life than a flat block colour.
• How do I clean tortoiseshell acetate frames? Rinse off any grit, then wipe with a microfibre cloth, never a shirt hem or tissue, which can dull the glossy finish over time. Store them in a case when you're not wearing them, and the acetate will keep its depth and shine for years.

Sources

[1] Tortoiseshell: Too Rare To Wear, SWOT / State of the World's Sea Turtles — https://www.seaturtlestatus.org/articles/2017/tortoiseshell-too-rare-to-wear