They lived in the ocean, millions of years ago. Now they are fossils, polished smooth by time — three different colours, three different sizes. There is something magical about fossils. They are not just rocks. They are the preserved remains of living things — creatures that swam, crawled, and lived in the ancient oceans, long before humans existed. This listing is for a set of 3 natural sea urchin fossils — three echinoid specimens, sometimes called "sand dollars" or "sea cookies". They are the hard, rounded shells (tests) of ancient sea urchins, preserved in limestone and fossilized over millions of years. Each one is different: Specimen #1 (X024): Warm golden-yellow, flattened and round. 7 × 7 × 2 cm, 113 g. Clear five-pointed star pattern on the surface. Specimen #2 (X028): Pale cream / beige colour, medium-sized. 7.7 × 7.6 × 2.1 cm, 136.6 g. Softer, more muted patterns. Specimen #3 (X046): Greyish-brown, the thickest and most rounded. 7.2 × 6.6 × 2.3 cm, 141.8 g. Deeper, more three-dimensional star ridges. All three have the distinctive five-pointed star pattern — the ambulacral grooves, which are the signature of echinoderms (the same group that includes starfish and sea cucumbers). These are not replicas. These are real, natural fossils, dug from the earth. Every fossil is unique — the shape, the colour, the preservation, the patterns, are all natural. No two fossils are ever the same. It is the kind of set you would find in a geology classroom, in a natural history museum, or in a collector's cabinet of curiosities. They are small enough to hold in the palm of your hand, but each one carries millions of years of history. Whether you are a fossil collector, a geology student, a teacher looking for classroom specimens, or simply someone who loves deep time and natural history — this set of three sea urchin fossils is more than just rocks. They are three small, preserved pieces of an ancient ocean, ready to be displayed on your shelf. Specifications: Type: Set of 3 natural sea urchin (echinoid) fossils Quantity: 3 pieces Specimen #1 (X024): 7 × 7 × 2 cm, 113 g — golden yellow Specimen #2 (X028): 7.7 × 7.6 × 2.1 cm, 136.6 g — cream beige Specimen #3 (X046): 7.2 × 6.6 × 2.3 cm, 141.8 g — grey brown Features: Round flattened shape, five-pointed star pattern, natural colour variation Condition: Natural fossils, surface partially polished Style: Natural history / geology / curiosities / education They are three creatures from the ancient ocean, turned to stone, in three different colours and sizes. You get to collect them.