Jack Spicer's "A Diamond" begins with a claim so bare it almost sounds like a dare: somewhere "at the heart of the moon or the branches or my nakedness" there is a diamond, and "there is nothing in the universe like diamond / Nothing in the whole mind." The poem is about the hunger for something pure and unbreakable at the center of experience, and about the strange fact that language can only point toward it, never hold it. By the end, the diamond has not been explained at all. It has simply been repeated, and that repetition turns out to be the point.
Notice first how oddly the opening list is built. The moon, the branches and "my nakedness" belong to wildly different orders of things: a distant celestial body, a piece of the nearby natural world, and the speaker's own exposed self. The "or" refuses to choose between them. The diamond might be anywhere, and the poem treats the cosmos, the garden and the body as equally likely hiding places. The final phrase, "the whole mind," quietly shifts the setting. The diamond may not be out in the world at all but a quality of attention, something the mind recognizes in whatever it looks at.
The second stanza turns from the diamond to the poem itself, and the move is startling: "The poem is a seagull resting on a pier at the end of the ocean." This is not a comparison with "like" or "as." The poem simply is the bird, and the sentence builds an image of rest, edge and distance, a creature poised where land runs out. A few lines later the speaker makes a request rather than a statement: "I ask for the poem to be as pure as a seagull's belly." That is a small, humble, almost prayerful line. The speaker does not claim to have achieved purity, only to be asking for it, which gives the poem a note of vulnerability beneath its cool surface.
The dog is the poem's most puzzling figure. The dog howls three times, at exactly the things listed in the first stanza: the moon, the branches, the nakedness. The repeated "A dog howls at" has the pull of a chant, and the last variation breaks the pattern: "A dog howling with pure mind." The howl is an animal's wordless answer to the same objects that make the speaker reach for words. Where the speaker asks, the dog simply cries out. One way to read the dog is as instinct, a response with no gap between feeling and sound, which is the kind of purity the speaker envies. That is an interpretation rather than something the poem states, but the shift from "at" to "with" invites it: the dog is no longer just aimed at the world but speaks from inside a pure mind.
The final stanza returns to the opening lines almost word for word, but everything around them has changed. "The universe falls apart and discloses a diamond" is the most dramatic moment, a collapse that turns out to be a revelation. Meanwhile, "Two words called seagull are peacefully floating out where the waves are." This is a lovely and slightly unsettling image, because the bird has become language. It is no longer a seagull but two words, the phrase "called seagull" reminding us that the name is not the animal. The poem admits it is made of words, and yet those words float peacefully, as if that were enough.
Then comes the grimmest line: "The dog is dead there with the moon, with the branches, with my nakedness." The howling has stopped, and the dog now lies among the same things it once cried at. The poem does not explain this death, and it would be a mistake to pretend it does. What the line does is quiet the whole scene. Instinct, desire and the world they were aimed at all end up in the same place.
The refrain closes the poem, and because we have traveled through seagulls, howls and death to reach it, it sounds different the second time. It is less a boast now than a settled fact. That circular structure, with its short, plain lines and absence of rhyme, is what gives the poem its odd calm. It has the shape of a ritual: say the thing, test it, say it again.