The 38th wedding anniversary is beryl, sometimes listed as tourmaline. Almost nobody knows what beryl is, which is funny, because most people have already given it. Emerald is beryl. Aquamarine is beryl. Morganite is beryl. They are the same mineral with different trace elements: chromium turns it green, iron turns it blue, manganese turns it pink.
So year 38 is not naming a new stone. It is naming the family that several of the famous anniversary stones belong to. After 38 years, that seems like the correct move. You stop cataloguing the individual good years and start noticing they were all the same thing wearing different colors.
The two candidates, briefly
Beryl, as above, is one mineral with a wide color range depending on what impurities got into the crystal while it formed. Tourmaline is a different mineral entirely, and it is famous for something related: a single tourmaline crystal can change color along its length. Watermelon tourmaline is pink at the core and green at the rim, in one continuous piece that grew that way.
Both stones are pointing at the same idea from different directions. One substance, more than one appearance, no contradiction between them.
Why I would not buy the stone
Here is my standing objection to gemstone anniversary years, and 38 is the clearest case of it. A loose stone or a small pendant bought to satisfy a list gets worn twice and then lives in a box. Unless the person already wears jewelry regularly and you know what they actually reach for, a gemstone purchase is a gift to a drawer.
Nobody in the guides will tell you this because gemstones are easy to write about and easy to sell. I sell wall pieces, so I have my own bias, and I will state it plainly: I would rather someone spend $90 on something that gets looked at daily than $300 on something correct that gets looked at annually.
What to take from the stone instead
The usable idea is range. One thing, many versions. Thirty-eight years is long enough that the marriage has genuinely been several different marriages: the broke one, the one with small children in it, the one where both careers went sideways at once, the current one where the house is finally quiet.
A timeline piece is the direct expression of that, and it is the format I would push for a 38th over anything else. The rule I give everyone still applies: choose fewer moments than feel right. I go into the selection problem in more detail in my guide on choosing the moments for a love story timeline, but the short version is that six well chosen dates beat twelve complete ones, every time.
One adjustment specific to this year. Let both of them contribute dates separately, without conferring. The overlap is the piece. The dates only one of them named are the conversation, and I have had customers tell me that conversation was the actual gift.
If you want the color literally
Green and blue-green is the beryl palette, and it happens to be one of the easier palettes to put on a wall without fighting a room. Sage and deep teal both sit well against warm wood and against white walls, which is more than can be said for the ruby red of year 40.
Worth knowing before you order: the same color reads noticeably differently depending on what it is printed or painted on. Canvas absorbs and softens it, wood shifts it warmer, metal keeps it flat and saturated. I compared these directly in why the same design looks different on canvas than on wood, because it surprises people often enough that I stopped assuming it was obvious.
Sizes and money
Timeline pieces need horizontal room. For six to eight moments, 12x24 or 16x24 inches is the working range; anything smaller and the dates start crowding. Expect $75 to $160 for personalized work at those dimensions.
If wall space is limited, a vertical timeline at 11x17 works, but cap it at five moments. Vertical formats punish density in a way horizontal ones do not.
The year before the corner
Thirty-eight is two years from a ruby anniversary that will get a party, a cake, and probably a hotel. Which means there is a real argument for keeping this year deliberately small and personal, and putting the effort into something the two of them see rather than something the guests see. The anniversary collection is organized with that distinction in mind, because after enough years the private gifts are the ones that keep getting mentioned back to me.
One material, several marriages
Beryl is a good symbol precisely because it refuses to be one thing. Green, blue, pink, same crystal. A couple at 38 years has been through enough versions of themselves that a stone which changes color depending on what got into it while it was forming is not a bad way to describe them.