Hold the phone! I make mostly earring and necklace sets and find people love getting the earrings (they think for free!) with a necklace. If they're not so crazy about the earrings, I suggest giving them as a gift. If the earrings prove a deal breaker, I'll offer to take the earring s and charge $10 less. Of course, the cost is all built in, so I'm not losing anything. Recently, a customer wanter a tourmaline necklace without the earrings. I took $20 of for that sale and sold the earrings later that same day for $48.
As for a matching bracelet, I sometimes make them, sometimes not, but it's nice to offer it as an "add on" when closing the sale. Or, "Did you see the ring that will match your set perfectly?"
If you don't make sets, be sure to have some "add ons" whether it be earrings, bracelets or rings" when closing the sale.