Simple wire fibula

Roman fibula (pins) could be be simple or very ornate, varying in shape, based on time period and location.

From:  https://www.britishmuseum.org/research/collection_online/collection_object_details.aspx?objectId=457675&partId=1&searchText=Fibula&images=true&view=list&page=3

This is a step by step for making a basic fibula from wire.  I used 16 gauge wire, but they can be done with different gauges, depending on the softness of the wire.

I use three different tools when making them.

Round pliers.

 Flat pliers.

Wire cutter.

Unless I am using up wire scraps, I leave the wire on the spool.  First, I make a small loop using the round pliers.

Then I make another open loop next to the first using the round pliers.

Next you clamp the two loops using the flat pliers, and bend the working wire at a 90 degree angle.  If you clamp it with part of the first loop exposed you will have a narrow pin, if you clamp with none of it exposed, the pin will be wider.

Using the round pliers to make the spring.  Grip at the desired length, then moving in the direction of the catch wrap the wire one and a half times around one jaw of the pliers, before guiding the wire into the catch.  You may need to twist the spring section a little to make sure it aligns with the catch, so the wire will sit correctly.  Trim the wire, and straighten any wonky bits.  If you would like it to be sharp, you can file the tip of the wire into a point.