Horse jewelry necklaces and horse pendants make spectacular gifts.
I know many girls who have gold horse pendants and never, ever take them off. A horse necklace is a gift that will bring pleasure for a long time.
When looking at necklaces and pendants consider the chain. A very fine chain will be lovely for special occassions but if it is for everyday wear than ensure the chain is thick and sturdy especially for the active horse rider.
I did manage to find a range of interesting horse head pendents - most of which also come as pins (something to think about).
Gold is such timeless jewelry that these will be treasured for many years to come.