We engraved our favorites rope knots on a stainless steel bead with a lobster claw clasp. 
 
Available in these nautical designs:
Bowline Knot in Turquoise
Figure 8 Knot in Black
Rolling Hitch Knot in Blue
Reef Knot in Royal
 
Size Guide:
Small: 6.5”
Medium: 7”
Large: 7.5”
X-Large: 8”