Gauri Valampuries showing presence of dark brown or black periostrachum (conch skin) spots near its cavity on main body whorl look beautiful and are rare and expensive. Giant Valampuries more than 10 kg are extremely rare.
The presence of dark brown or black periostracum spots near the cavity on the main body whorl of Gauri Valampuries is a striking feature that makes them visually appealing and rare, with high value.  Giant Valampuries exceeding 10 kilograms in weight are exceptionally rare.