I've made this lovely necklace using natural pink biwa pearls, separated by a small golden rutile quartz bead and finished with a length of 925 sterling silver chain.
 
The shimmer of the nacre on these pearls is reminiscent of the sea, so would be wonderful for a beach wedding.
 
The length of this necklace is 18 inches / 45 cms long of which approximately 10 inches / 26.5 cms is made up of the pearls and beads, and the remaining 8 inches / 18.5 cms is the sterling silver chain and clasp.