Note: "Carouse" is usually used as a verb meaning "to engage in noisy revelry or drinking". It's less common to use it as a noun.
To make the sentence grammatically correct and make sense, you could change "carouse" to "carousel" which means a rotating stand or display, often for goods.
Here's the corrected sentence:
"The antique shop owner had a beautiful carousel of antique jewelry, each piece more stunning than the last."