These are the matching earrings to the "Floral Vine Necklace w/ Toggle Clasp in Nylon" I have for sale here: http://shpws.me/mWdH
*PLEASE NOTE that this does not always come with the earring hooks. I'm not positive if Shapeways is still automatically giving those along with earrings. Also note that the black earrings have more of a texture than the colors, and care should be taken to not brush them against fabrics that can snag easily.
Ear wires are sold at most arts and crafts stores and many places online, just make sure the ear hook loop is at least 1.4 mm wide to fit the top of the earring.
ONLY if in the United States you can email me after making your purchase at info at cwestbrook dot com and I'll send you ear wires at no extra charge. Attach proof of purchase (your email receipt from Shapeways) and make sure it doesn't have any personal information except the address you'd like me to send the ear wires too. The ear wires are stainless steel. You'll just need a pair of pliers to open the loop and slide the earring on, then close the loop and it's ready to wear.