I'm not sure how much you want to spend, but I would recommend moissanite...
"Moissanite was introduced to the jewelry market in 1998.
It is regarded as an excellent fine jewel, with some optical properties
exceeding those of diamond. Its ethical production makes it a popular
alternative to diamonds. On the Mohs scale it is a 9.5, with a diamond being a 10.
Moissanite is stronger than sapphire or ruby. ...
Because of its hardness, it can be used in high-pressure experiments, as a replacement for diamond (see diamond anvil cell).[5]
Since large diamonds are usually too expensive to be used as anvils,
synthetic moissanite is more often used in large-volume experiments.
Synthetic moissanite is also interesting for electronic and thermal applications because its thermal conductivity is similar to that of diamonds."from:
http://en.wikipedia.org/wiki/MoissaniteI found these ($150-ish):
http://www.moissanite.com/shop.....aire-four-And this blurb on moissanite too (from Charles & Colvard):
http://www.charlesandcolvard.c.....te-gemstonIf you went this route, you'd likely never have to replace your 'diamond' earrings - moissanite is
extremely durable and 'as good as' diamond earrings.
In terms of a nice pair of CZ earrings - it looks like you have some great advice from other YLF'ers. I know it sounds silly, but I would recommend making sure that any 'faux' diamond earrings you get are set in silver, white gold, yellow gold or even platinum. This will make them last for years and years. I don't know about you, but 'base' metals seem to irritate my skin, and the jewelry just doesn't seem to last as long. I know it sounds strange that you'd consider CZ in a real gold or silver setting, but trust me - it'll be worth it. You'd be able to wear them for years and never even think about bothering to get real diamonds. Just a thought - faux stones, but *good quality* settings, real silver/gold/platinum etc.
Looking forward to hearing what you find!
Smart, and stylish idea - to have a classic pair of "diamond" earrings on hand.