Kindly help me identify this thing found in beach
Chennai, India . Size would be just 1.5 cm in diameter..across maximum size. It's shelled and has something inside it. It make a small noise when it is shaked completely closed on all sides. It's hard surface ( but " fine" texture ) to touch.
I believe it’s the seed of a Guilandina bonduc shrub. The seeds are known as nickernuts or sea pearls, and can be found washed up on beaches throughout the tropics. The seeds are often used as counters in the traditional board game manuals.