I am a sucker for opals and this is a pretty way to have or gift one at a good price. By Stargaze Jewelry, it’s available in either a gold or silver plated (over brass) 14 inch chain with a two inch extender. The size of the opal is not noted.

This sells for USD$39 and at the time of this writing, they were having a 40% off sale (which may not apply by the time this is posted).