珠しゅ玉ぎょく

宝ほう石せきN3sense 1
宝石 is the everyday word for a jewel or gemstone, while 珠玉 is a literary term for the same thing and is also used metaphorically for a masterpiece.
傑けっ作さくN2sense 2
傑作 is a common word for an outstanding work of art, while 珠玉 carries a more poetic, jewel-like connotation of preciousness.
名めい作さくN3sense 2
名作 simply means a famous or well-regarded work, whereas 珠玉 emphasizes the work's exquisite, gem-like quality.
逸いっ品ぴん sense 2
逸品 highlights an item's superb craftsmanship or rarity, while 珠玉 stresses its beauty and preciousness, often for short literary works.
金きん玉ぎょく
珠玉 is a literary term for something as precious as a gem, often used metaphorically for fine works of art, while 金玉 refers more literally to gold and jewels as material wealth.

Opposites

駄だ作さくN1sense 2
駄作 means a poor or worthless work, the opposite of 珠玉 used to praise a masterpiece.

個こN5
counter for small objects; counter for pieces · counter for military units · individual; one person · counter for years of age difference; counter for school years

From Chinese 珠玉 (zhūyù), literally 'pearl and jade', referring to precious stones and by extension something of great value.