A specific kind of
rudraksha, a bead fashioned from the dried seed of the Shiva-honoring tree
Elaeocarpus ganitrus.
Shiva's worshippers often wear rudrakshas strung into
garlands (bhakta).
When two seeds grow together organically, the GauriShankar
rudraksha is created.
Despite the fact that the Gauri-Shankar is not as uncommon
as some other beads, it is unique enough to attract a high price.
The GauriShankar is seen as a natural manifestation of the
celestial pair, Parvati (Gauri) and Shiva (Shiva) (Shankar).
Shiva as wisdom and Parvati as Shakti or strength embody the whole presence of god in both its everlasting and dynamic aspects.
You may also want to read more about Hinduism here.
Be sure to check out my writings on religion here.