diff --git a/include/effect_diamond.h b/include/effect_diamond.h
new file mode 100644
index 0000000..f24ac0a
--- /dev/null
+++ b/include/effect_diamond.h
@@ -0,0 +1,11 @@
+#pragma once
+#include "Effect.h"
+
+class DiamondEffect : public Effect {
+private:
+	Window* window = &Window::window_with_clock;
+public:
+	void loop(uint16_t ms) override;
+	bool can_be_shown_with_clock() override;
+	String get_name() override { return "diamond"; }
+};
diff --git a/src/effect_diamond.cpp b/src/effect_diamond.cpp
new file mode 100644
index 0000000..eff96f9
--- /dev/null
+++ b/src/effect_diamond.cpp
@@ -0,0 +1,14 @@
+#include "effect_diamond.h"
+#include "my_fastled.h"
+
+void DiamondEffect::loop(uint16_t ms) {
+	for (int x=0; x<window->width; x++) {
+		for (int y=0; y<window->height; y++) {
+			uint8_t distance = abs(window->height/2 - y) + abs(window->width/2 - x);
+			CRGB col = CHSV(distance*8 - (millis()>>5)%255, 255, 255);
+			window->setPixel(x, y, &col);
+		}
+	}
+}
+
+bool DiamondEffect::can_be_shown_with_clock() { return true; }
diff --git a/src/effects.cpp b/src/effects.cpp
index 2299031..08837ad 100644
--- a/src/effects.cpp
+++ b/src/effects.cpp
@@ -24,6 +24,7 @@
 #include "effect_blur2d.h"
 #include "effect_tv_static.h"
 #include "effect_lightspeed.h"
+#include "effect_diamond.h"
 
 Effect* current_effect;
 
@@ -64,8 +65,9 @@ EffectEntry effects[] = {
 	/* 29 */ {"koopa",                 0,     [](){ return new AnimationEffect("/koopa.pia"); }},
 	/* 30 */ {"cake",                  0,     [](){ return new AnimationEffect("/cake.pia"); }},
 	/* 31 */ {"kid",                   0,     [](){ return new AnimationEffect("/kid.pia"); }},
+	/* 32 */ {"diamond",               true,  [](){ return new DiamondEffect(); }},
 };
-const uint8_t effects_size = 32;
+const uint8_t effects_size = 33;
 
 
 Effect* select_effect(const char* name) {