Eighteenth Anniversary Stone: Cat's-Eye
The eighteenth wedding anniversary stone is chrysoberyl cat's-eye. Here's what it is, how it holds up to everyday wear, and how to turn it into a piece worth keeping.
Key takeaways
- The traditional 18th anniversary stone is cat's-eye chrysoberyl, while the modern anniversary list uses aquamarine.
- Cat's-eye is a chrysoberyl that shows a single bright line of light across its dome, an effect called chatoyancy, and it is a genuinely hard, durable stone at about 8.5 on the Mohs scale.
- The modern choice, aquamarine, is the pale sea-blue member of the beryl family and reads clean and calm rather than showy.
- Cat's-eye at 8.5 is one of the tougher coloured stones you can buy, so it stands up well to everyday wear in a ring.
- We cut and set both stones by hand in our Coquitlam workshop, and cat's-eye in particular needs a jeweller who knows how to orient the stone so the eye sits straight.
- See how year eighteen fits alongside the other anniversary stones before you choose.
What is the 18th anniversary stone?
The 18th anniversary stone is cat's-eye chrysoberyl on the traditional list, with aquamarine as the modern alternative. This is a year where the two lists genuinely diverge, so it helps to know both before you shop. The older custom points to cat's-eye, an unusual and slightly mysterious stone, while the more recent modern list, such as the one published by Angara, swaps in aquamarine, which is easier to find and easier on the budget. You cannot go wrong with either. One is a conversation piece; the other is a soft, wearable blue.
About cat's-eye and aquamarine
Cat's-eye is a variety of the mineral chrysoberyl. What makes it special is a single sharp band of light that runs across the top of the cut stone and shifts as you tilt it, exactly like the slit pupil of a cat's eye. That effect is called chatoyancy, and it comes from tiny parallel needle-like inclusions inside the stone that reflect light in one line. The best cat's-eyes are a honey to greenish-brown colour with a crisp, well-centred eye. Because it is a chrysoberyl, it is hard, sitting at around 8.5 on the Mohs scale, which puts it among the tougher coloured gems and well suited to daily wear.
Aquamarine, the modern pick, is the pale blue-to-sea-green member of the beryl family, the same family as emerald. Its blue is usually gentle rather than intense, which is part of the appeal for people who find sapphire too dark. It is also plenty durable, around 7.5 to 8 on the same scale. You can read more about it on our aquamarine page, where we go into colour grades and shapes.
Why these stones for year eighteen
There is no ancient tradition binding cat's-eye to the eighteenth year in particular; the anniversary lists simply assigned it. What cat's-eye does bring is the folklore around the eye itself. Across several cultures the moving line of light was read as a watchful eye, a symbol of protection and clear sight. Whether or not you put stock in that, it is a fitting idea for eighteen years of a marriage: two people who have learned to see each other clearly. Aquamarine leans on the water association in its name, calm, steady, the colour of the sea, which is an easy metaphor for a long partnership that has found its level. Neither meaning is worth treating as fact, but both give the gift a story to tell.
Choosing a piece for the eighteenth
Cat's-eye rewards a jeweller who knows what they are doing. The stone has to be cut as a smooth dome, a cabochon, and oriented so the eye runs straight across the top; get the angle wrong and the effect is muddy or off-centre. At 8.5 hardness it is genuinely fine for an everyday ring, which is rare among unusual coloured stones. Because the eye is the whole point, I would set it high enough to catch the light and let people tilt it, and pair it with a plain metal so nothing competes with the moving line. A cat's-eye ring or a pendant both work well. Aquamarine, being faceted and pale, does its best work in a piece with a bit of size to it, a larger pendant or a cocktail ring, where there is enough stone for the blue to actually register. We do all of this by hand in Coquitlam, cutting cabochons in-house and setting faceted stones to order, so we can orient a cat's-eye correctly and match an aquamarine to a metal that keeps it looking bright rather than washed out. Yellow gold warms up a pale aqua; white metals keep it cool and crisp.
Care notes
Cat's-eye is hard and low-maintenance. Warm water, mild soap, and a soft brush keep it clean, and its high hardness means it resists scratches better than most coloured stones. Aquamarine is also durable but a bit more prone to internal fractures, so avoid knocks and skip ultrasonic cleaners if the stone has visible inclusions. Store both apart from diamond, which will scratch almost anything. With basic care, a cat's-eye set for an eighteenth anniversary will keep its eye and its polish for decades.
Turn your eighteenth anniversary stone into a piece you’ll wear
Bring the year, the stone and a rough budget. Our on-site goldsmith in Coquitlam will design it with you — reset a stone you already own, or build something new around the right gem.
Prefer to talk? Call our studio at (604) 653-6449.Frequently asked questions
What is the 18th wedding anniversary stone?
The traditional 18th anniversary stone is cat's-eye chrysoberyl, and the modern list uses aquamarine. Both are correct depending on which tradition you follow.
What is cat's-eye chrysoberyl?
It is a variety of the mineral chrysoberyl that shows a single bright band of light across its domed surface, an effect called chatoyancy. The best examples are a honey or greenish-brown colour with a sharp, centred eye.
Is cat's-eye durable enough for everyday wear?
Yes. Chrysoberyl sits at about 8.5 on the Mohs hardness scale, which makes cat's-eye one of the tougher coloured stones and well suited to daily rings.
What is the modern 18th anniversary stone?
The modern anniversary list uses aquamarine, the pale blue-to-sea-green member of the beryl family. It is easier to source and more affordable than cat's-eye.
Why does a cat's-eye stone show a line of light?
Tiny parallel needle-like inclusions inside the stone reflect light in a single line. When the stone is cut as a smooth dome and oriented correctly, that reflection appears as a moving eye.
How should a cat's-eye be cut and set?
It must be cut as a cabochon, a smooth dome, and oriented so the eye runs straight across the top. It is best set high enough to catch light, in a plain metal that does not compete with the eye.
Which colour metal suits aquamarine?
Yellow gold warms a pale aquamarine, while white gold or platinum keeps it cool and crisp. The right choice depends on how deep the blue of your particular stone is.
Can Vanhess make a custom cat's-eye or aquamarine piece?
Yes. We cut cabochons and set faceted stones by hand in our Coquitlam workshop, so we can orient a cat's-eye so the eye sits straight and match an aquamarine to the right metal.