At Wedding in Hawaii the Conch shell is used to announce the arrival of the bride
though of course they make for nice photo props also

Groom hold a dark pink plumeria flower lei ready to give her for the ceremony while holding a Hawaiian conch shell too

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Tradition has it the shell is sounded in the four direction
Starting East - North - West and than South

The Hawaiian Shell "conch"

The Pu { Large Shell} was sometimes used to announce chants, hula dancers,
and was used to announce the coming of the Kings canoes as it arrived to the different islands .
Now sometimes when couples are wanting to have a Hawaiian "feel" to their wedding
they are choosing to have the shell sound right before the bride starts to walk
signaling to everyone the bride is coming,

Teri family wedding setup in Hawaii

The word for the large shell that comes from the ocean is called " Pu ", The Hawaiian conch shell may be as large as 12 inches in length, |It is still used today as it was in the olden days to signify royalty or an important event was to start. it is blown much like a trumpet is blown. The sound vibration of the Hawaiian shell Pu can be heard if blown correctly miles away . The Hawaiian tradition still hold for modern times and is used frequently on all the island of Hawaii,

This wedding in Hawaii on the beach of Kailua the groom is practicing blowing the conch shell before his wedding ceremony Sea shell, Ocean Song play your a melody Sing about the ocean Tell me about the sea, Author: unknown

Here is a picture of a Conch shell
sitting in a wooden bowl
encircled by white tiny shell lei
in the background you see a cake and wedding set up

The conch shell sits under the gazebo on a table with flower leis such as green twinned tea leaf leis,
sky blue  orchids, and white ginger flowers for the wedding ceremony