Translation guide
In Japanese, the most common word for earring is イヤリング, but ピアス is used specifically for pierced earrings. The distinction is important because many Japanese people differentiate between clip-on and pierced types.
Referring to an earring in general, without specifying whether it is pierced or clip-on.
The most common and general term for earring. It can refer to both pierced and clip-on types, but traditionally it often implies non-pierced earrings.
新しいイヤリングを買った。
I bought new earrings.
そのイヤリング、とても似合ってるよ。
Those earrings really suit you.
Specifically refers to pierced earrings. Very common among younger people and in fashion contexts.
ピアスを開けたいんだけど、痛いかな？
I want to get my ears pierced, but does it hurt?
このピアスは誕生日プレゼントです。
These earrings are a birthday present.
Specifically referring to an earring that requires a pierced hole.
The standard term for pierced earrings. Use this when you want to be clear that it's for pierced ears.
ピアスをなくしちゃった。
I lost my earring.
An earring that clips onto the earlobe without a piercing.
To specify clip-on, you can say イヤリング and add クリップタイプ. Some people simply use イヤリング to mean clip-on by default.
クリップタイプのイヤリングを探しています。
I'm looking for clip-on earrings.
A compound word that directly means clip-on earring.
このクリップイヤリングは痛くないですか？
Are these clip-on earrings not painful?
Talking about earrings in the context of style, accessories, or shopping.
While not specific to earrings, アクセサリー is often used when discussing jewelry in general. You can specify 耳のアクセサリー if needed.
耳のアクセサリーを新調した。
I got new ear accessories (earrings).
イヤリング traditionally refers to non-pierced earrings, while ピアス refers to pierced ones. However, in casual conversation, イヤリング can be used as a general term for all earrings. If you want to be precise, use ピアス for pierced and イヤリング（クリップタイプ） for clip-on.
ピアスとイヤリング、どっちが好き？
Which do you prefer, pierced earrings or clip-on earrings?
The phrase ピアスを開ける (ピアスをあける) means 'to pierce one's ears'. It literally means 'to open a hole for a pierced earring'.
昨日ピアスを開けました。
I got my ears pierced yesterday.