人造 じんぞう宝石 ほうせきじゃありませんでした
jinzōhōsekijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 人造宝石

1. It was not a synthetic gem.; It wasn't an artificial jewel.

Past/Perfective
Negative
Polite
Terminal Form