You can use it as a simple piercing when you exchange the catch.
Glass part: about Φ 10 mm
Overall: 45 mm
Glass · Brass
Pierce metal fittings: K14 gf
<What is K14gf ...>
It is a gold layer crimped to a material (brass) with high heat and pressure, and when the weight of the gold layer is 1/20 or more of the total weight including the material, it is called <gf> gold filed (gold tension).
Because it is made of a much thicker layer than gold plating, there is little to be peeled off even if it is used for a long time.
Also different from plating, there is a sense of luxury in the color of the gold.