These are fun, inexpensive and light to wear earrings that mimic natural horn are made by L. Erickson. They come in a range of different colours, and measure 2 1/4″ long and 1/2″ wide. Made of cellulose acetate (a fancy name for a type of plastic) they are available from FranceLuxe for USD $58.
The site’s actual claim to fame is hair accessories. They have a huge variety of hair clips, pony tail holders, headbands and more (and many are jewelled – yay!). Worth a browse.