These Antelope or Chop Kachina watch tips are a stylized representation of a rain bringing heribivor deity that with the deer and ram, help crops and grasses to grow providing needed moisture and food. It is also believed the Antelope and his fellow kachinas in this group, help with control of spasms.
The best book to explain the steps in creating Zuni jewelry is Oscar Branson's Indian Jewelry Making. Volume II.