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The "star" phenomenon in gemstones refers to a unique optical effect where a star-like pattern appears on the surface of the stone, typically when viewed under direct light. This effect is caused by the presence of needle-like inclusions, such as rutile, within the gemstone. When the stone is cut into a cabochon shape (a smooth, rounded shape with a flat bottom), the inclusions create a star-shaped reflection. This phenomenon is most commonly seen in gemstones like sapphire, garnet, and spinel, adding a distinctive and captivating beauty to the stone. Star gemstones are prized for their rarity and unique appearance.