UAP Case Archive

Shapes / Diamonds

Diamonds

Diamond is rarely the first word a witness reaches for. When it does turn up, it tends to come with paperwork: two of these ten cases involve military aircraft flying near the object, and three come from official files released by the U.S. or U.K. governments.

    Calvine, Scotland, 1990: a "squashed diamond." Drawing for reference only.
    Each diamond is one case, colored by status. Select one to open it below.

    Start with Calvine.

    It is the best-known diamond case and the best photograph anywhere in the archive. It also comes with a mystery of its own: the negatives disappeared, and the one surviving print spent 32 years in a drawer.

    On the evening of August 4, 1990, two men on the moors above Calvine, in the Scottish Highlands, heard a low hum and saw a large diamond-shaped object hanging silently in the sky. They took cover under trees and took six photographs over about ten minutes. Then it climbed straight up and was gone.

    A jet made several low passes while they watched. The Ministry of Defence's photo analysts later identified it as a Harrier, with a faint second Harrier in one frame, though the ministry had no record of Harriers flying there at that time.

    The men gave their prints and negatives to the Daily Record, which passed them to the MoD. The story never ran, and the originals vanished. Retired RAF press officer Craig Lindsay kept one print. It was published by researcher David Clarke in August 2022. The photographers have never been identified.

    What the photograph does and does not show

    • TestedPhotographic specialist Andrew Robinson of Sheffield Hallam found a genuine photograph of a real scene, with no evidence of staging.
    • TestedThe top half of the diamond is not a mirror image of the bottom, which argues against a simple reflection.
    • ProposedA doctored reflection in a lake, as former AARO director Sean Kirkpatrick has been quoted saying.
    • ProposedAn object hung from a branch, or a hilltop rising from mist. Clarke's team says Robinson's analysis rules out the mist idea.
    • UnconfirmedA classified U.S. aircraft. A Defence Intelligence source and an MoD officer each told Clarke as much; neither claim has been confirmed.

    What the record shows.

    Ten cases is a small set, but a few patterns hold across it.

    It keeps company with the military.

    Helicopters surround it at Cash-Landrum, a Harrier passes it at Calvine, an F-4 chases it over Tehran, it drifts past a nuclear weapons plant at Pantex, and a U.S. military sensor records it over Greece. That is why the secret-aircraft theory follows this shape more than any other.

    It usually stands upright.

    Cash-Landrum's diamond had its top and bottom cut flat. Pantex was taller than it was wide and rounded at the top. Godfrey's lower half was spinning like a top. A flat, horizontal rhombus is rarer than a vertical one.

    The word often arrives late.

    At Cash-Landrum it came from a seven-year-old and was adopted months later. Over Tehran, the pilot first said the lights were too bright to see a body. At Greece, the written report and the video disagree. Each case below notes who first used the word, where the sources allow.

    Government files carry the weight.

    The MoD's Calvine papers were released in 2009. The Pentagon's PURSUE program released the Kirby photograph, the Greece video and the Pantex report in 2026, and the Anoka reports came out through the National Archives. Each is a primary record you can read yourself.

    Texas appears three times.

    Kirby's 1956 photograph and the 2015 Pantex incident both happened around Amarillo, and Cash-Landrum happened north of Houston. It is a coincidence, not a pattern.

    The shape words vary.

    "Diamond," "upright diamond" with flat ends, "squashed diamond," "diamond type-shape, more rounded at the top," "round diamond shape" with a "tail," and a spinning diamond. Every case keeps the exact words used.

    Often told wrong.

    Several of these stories have drifted a long way from the record. Here is what the earliest sources actually say.

    The story you may have heardWhat the record shows
    Betty Cash and Vickie Landrum saw a huge diamond.
    In their first recorded interview, 34 days later, Cash said the lights were too bright to make out a shape. Only seven-year-old Colby insisted it was a diamond. The signed diamond sketch came eight months after the event.
    The famous Calvine image online is the photograph.
    Before 2022, the image that circulated was a reconstruction Nick Pope made with a graphic artist for a 2015 documentary. The surviving original print was first published in August 2022.
    The Calvine photographer was Kevin Russell.
    That name is written on the back of the print, but the man traced by that name in 2024 denied any knowledge of it. The photographers have never been identified.
    A large diamond-shaped craft flew over the Pantex nuclear plant.
    The officers described something about 4 ft tall and 2 ft wide at the base, drifting at 10 to 15 mph.
    The 2024 Greece object was a diamond.
    The mission report says diamond. The released infrared video shows something closer to a teardrop with a trailing mass beneath it.
    Anoka police watched a diamond for 90 minutes.
    The 90-minute object on February 19 looked like a diagram of an atom. The diamond comes from the same officer's patrol sighting two nights earlier.

    All ten cases.

    Listed oldest first. Each card says what kind of evidence the case rests on, because a lone eyewitness, a photograph, a sensor video and a security log deserve to be weighed differently.

      Why cameras make diamonds.

      Point a camera at a distant light and let it fall out of focus, and the light does not blur into a soft circle. It takes the shape of the opening in the lens iris.

      Many camcorders and compact cameras close their iris with just two blades, which leaves a diamond-shaped opening. On those cameras a defocused star, planet or aircraft light turns into a clean, glowing diamond. When autofocus hunts, the diamond swells, shrinks and seems to pulse.

      That accounts for many viral "diamond UFO" clips. None of the ten cases on this page rests on that kind of footage alone.

      distant light lens two-blade iris what the camera records

      Left off this page.

      These reports are often described as diamonds but don't hold up as a single diamond-shaped object.

      • Eglin Air Force Base, 2023Several objects flying in a diamond formation, not one diamond-shaped object.
      • Lake Huron shootdown, 2023Officials described the object as octagonal, and The War Zone concluded the released video looks like a balloon.
      • USS Russell, 2019Flashing "pyramid" shapes, which belong with the triangles.
      • The Belgian wave, 1989 to 1990Triangles, filed with the triangles, though some summaries call the Eupen object a diamond.