The compound adjective 'well-cut' is a straightforward combination of the native English adverb 'well' and the past participle 'cut'. The adverb 'well', with its Proto-Germanic root wel, conveys the sense of doing something in a proper, satisfactory, or pleasing manner. The verb 'cut', with a history in Middle English of uncertain but likely Germanic origin, refers to the action of dividing or shaping material with a sharp tool. When combined, the term literally describes something that has been "cut well" or "properly shaped," a meaning which seamlessly transferred to the tailoring of garments and the crafting of gemstones. Its logic is transparent, directly linking the quality of the craftsmanship ('well') to the specific action of fashioning ('cut').

Structure: well (adverb) + cut (verb, past participle) - well: From Old English wel, meaning "in a good manner, properly, suitably." It functions as an adverb modifying the participle 'cut'. - cut: From Middle English cutten, of uncertain origin, possibly from Old Norse or a native Germanic root. In this compound, it functions as a verb in its past participle form, meaning "shaped or fashioned by cutting."