Shape and size of the left and right is a little different from also features.
Glass parts: about φ12mm / about φ13mm
Pierce bracket: 14K Gold filled (catch the resin)
<... The K14gf>
A layer of gold which was pressed against the material (brass) in the high heat and pressure, is called when the weight of the layers of the gold is greater than or equal to 1/20 of the total weight, including the material <gf> Gold filled (gold plating).
Because it is made at a much thicker layer than gold plating, there is no little thing to come come off even if used for a long period of time.
Also unlike plating, there is a sense of quality in gold shades.
Origin / production method