Simple elastic bracelets - 
This stack contains three elastic bracelets; an obsidian bead bracelet, a amazonite and obsidian bracelet and a black agate tube bead bracelet. 

Cut a length of elastic and thread on your beads. Wrap this around your wrist to see how long the bracelet will be when it is knotted.
When you are happy with the amount of beads and length of your bracelet, pull and knot the elastic so that the beads are close together and won't move when the knot is secured. Knot and secure with a drop of clear nailpolish or glue. Trim excess elastic. 

To create the centre bracelet with your agate marquise bead, repeat the elastic bracelet process using amazonite beads and add your agate bead at the end. 
Knot the elastic twice and secure with a drop of glue or a clear nail varnish. Hide the knot inside the agate marquise bead. 

Create a simple beaded chain bracelet by threading individual beads onto eyepins. Trim and loop the eyepins at the other end. Connect each bead/eyepin using small jumprings until you have the length of bracelet needed to fit your wrist. Attach a lobster clasp to one end of the bracelet and a few more jumprings to act as an extension chain at the other end of the bracelet.