Here is a necklace that I created that looks really classy :) Hope you'll be able to follow through the steps.
First, with an arm span of thread I thread in a seed bead and place it at the center of the thread followed by a pearl.
Next, on my left and right threads I thread in 5 seed beads, cross the thread into a bicone, and then thread in a bicone on the left and right thread again, and cross it into a bicone. The arrows will help so you can follow the steps.
On the right thread I have 6 seed beads and on my left thread I have 2 seed beads, a pearl and 2 seed beads. Then cross both threads into a bicone.
Follow the pattern of sliding in the beads until you reach your desired length. At the end of the right thread slide in 15 seed beads and make a loop by bringing the thread back into the bicone.
Insert both threads into the next bicone, seed beads and a pearl until the left thread comes out of the pearl and the right thread comes out of the seed beads.
On your left, thread in a pearl and on your right, thread in 2 pearls. Then cross the threads into the pearl.
Looking at the picture, on my right I have 2 seed beads, a bicone and 2 seed beads. On my left thread I have 2 seed beads then passed the thread into a bicone, and added again 2 seed beads and crossed the threads into a pearl.
Continue the pattern of sliding in the beads until you reach the other end of the necklace.
Once you're done secure the thread and cut off the excess. The pearl and the loop you created will serve as your clasp.