Tā de zhūbǎo zài dēngguāng xià xiǎnde géwài cuǐcàn.
Her jewellery looked especially resplendent under the lights.
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璀璨 is a literary and elevated adjective, typically used for stars, gemstones, lights, or great achievements. It sounds poetic in formal writing but would feel over-the-top in casual speech. The simpler alternative is 耀眼 (yàoyǎn) or 闪亮 (shǎnliàng).
