One list has a gift here. The other has a blank cell.
Search "11th anniversary gift" and nearly every result states the same thing without qualification: steel. That's accurate for the US traditional materials list, tracked in full on this calendar's comparison of the two lists, but it isn't the only list in circulation, and it isn't even universal within English-speaking countries. Wikipedia's sourced comparison table (checked 13 October 2026) sets a US column against a UK column, the US drawn from a Chicago Public Library reference compilation and the UK from the 1978-79 edition of Pears Cyclopaedia, and at the 11th row the US cell reads "Steel" while the UK cell is simply empty (checked 13 October 2026).
That gap isn't a formatting accident carried over from an old scan. The UK list does assign something to most of the surrounding years, including the 10th (tin) and the 12th (silk and fine linen); it skips straight over the 11th and picks back up after it. A reader relying on that particular British reference for gift ideas at year 11 would find no material assigned there, which is a stranger position to be in than simply preferring a different material.
Steel arrived in 1937, as part of a trade group's patch job
Before the 20th century, only a handful of anniversaries carried any generally recognized material at all: paper for the first, wood for the fifth, tin for the tenth, and a few others scattered by the early 1900s. The 11th year wasn't among them. In 1937, the American National Retail Jewelers Association, the group that later became Jewelers of America, published an expanded list covering every year from the first through the twentieth, filling in gaps including the 11th, according to Wikipedia's Wedding anniversary entry (checked 12 October 2026).
That timing means steel's status as the "traditional" 11th-year material is really a 1937 trade-group addition dressed in older language, the same pattern this calendar's page on the full anniversary-gift comparison already traces across the rest of the list. The cited comparison is edition-specific: its British column leaves year eleven empty, without establishing what every later British guide recommends.
The gemstone list disagrees too, and names turquoise
A second system, published separately and endorsed by JA alongside other jewelry organizations, assigns a gemstone rather than a household material to each anniversary year. Checked directly against Jewelers of America's current buying guide for this page, that chart names turquoise for the 11th anniversary, a completely different answer from either the US or UK materials list. At year 11 specifically, one system names a metal-based household object and the other a soft blue-green mineral, with no overlap between the two.
Turquoise itself carries a long, separate history as a birthstone rather than an anniversary gift, running from ancient Egyptian tomb jewelry through Persian palace decoration to the silver-and-turquoise style associated with Navajo artisans since the 1880s. This calendar's page on December's birthstones covers that history in full, since turquoise sits on that month's official list as well as on the 11th-anniversary gemstone chart.
A softer stone than the metal it's paired against
Steel and turquoise come from unrelated lists, and they hold up differently once someone actually owns them. Per GIA, turquoise rates 5 to 6 on the Mohs hardness scale, with fair-to-good toughness, and it's chemically sensitive: skin oils, cosmetics, and other chemicals can discolor it over time, and it can absorb liquids that leave lasting stains. GIA's own care guidance recommends against ultrasonic or steam cleaning, and advises removing the piece before applying lotion, perfume, or cleaning products rather than trying to wipe it clean afterward. Jewelers commonly steer turquoise toward earrings and pendants over rings and bracelets for the same reason: those settings see less daily friction and skin contact.
Turquoise gets its blue-to-green color from copper in its structure, per GIA's gem overview, with more copper producing a deeper blue and more iron pulling the color toward green; the stone forms where acidic, copper-rich groundwater seeps through aluminum- and phosphorus-bearing rock in dry regions, a process that can take thousands of years. A steel gift carries none of that fragility, which is part of why the two lists' answers for year 11 point in such different practical directions, not just different symbolic ones.
There's a buying wrinkle GIA flags directly, too: most turquoise sold today has been treated to improve its stability and color, and GIA's own buyer's guide advises checking with a jeweler who has the gemological expertise to say whether a specific stone has been treated at all. An untreated stone is softer and more prone to absorbing oils and darkening with wear than a stabilized one, so two pieces that look identical in a display case can hold up very differently a year later. None of that comes up when the gift is a steel knife set or a pair of cufflinks, which is a second, more mundane reason the two lists point buyers toward different kinds of shopping trips.
A third "modern" answer, with no source behind it
Beyond the traditional materials list and the Jewelers of America gemstone chart, many gift-shopping sites list a third theme for the 11th anniversary: fashion jewelry. Some attribute this "modern" list generally to a group of Chicago jewelers working in the 1950s, but none of the pages repeating that claim cite a named source, a publication, or a specific organization, and the claim doesn't trace back to anything more solid than other similar shopping guides. That's a different situation from the 1937 materials-list expansion or the current Jewelers of America chart, both of which point to a specific, named, checkable source.
Until a primary source turns up, the fashion-jewelry theme for year 11 belongs in the same category this calendar's page on National Boyfriend Day already found for a differently-unofficial kind of calendar entry: repeated widely, traceable to no one in particular.