The iridescent Opal is the birthstone for October, and is the tenth in a series of small birthstone samplers. I chose pink for the thread colour, as the alternate stone for October is the pink tourmaline. These can be stitched separately, or in combination. Stitch them as birth samplers, family samplers, wedding or anniversary samplers, or if you're really brave, stitch them all together! I've included a border idea for joining them up.