Colours will vary. The pencil’s large 5mm core is made of a special wax formula which is almost the consistency of a crayon. It easily picks up flat back and pointy back crystals for perfect positioning on your finished pieces. The wax material instantly releases the crystal when it’s set in place. It also won’t leae any colour or sticky residue on the crystals. As the tip wearsor becomes damaged over a period of time, peel back the cotton thread and peel to expose a new layer of wax.