This is the 8120th most frequent Japanese word.
封入
"封入" means "enclosure" or "sealing inside."
封入 is used here to mean 'contained inside' to indicate that special ingredients are embedded within or included in the product.
この製品には特別な成分が封入されています。
This product contains special ingredients.
封入 is used here to mean 'to enclose' or 'to insert' in preparation for embedding the materials within something, such as a package.
封入する予定の資料を準備しておいてください。
Please prepare the materials scheduled to be enclosed.
封入 implies that the gemstone is embedded or encapsulated within the resin, indicating a sealed or encased arrangement.