'sumptuously-crafted' combines 'sumptuously' (from 'sumptuous') and 'crafted' (from 'craft'). 'Sumptuous' originates from Latin, specifically the word 'sumptuosus', where 'sumptus' (past participle of 'sumere') meant 'expense' or 'that which is taken (i.e., spent)'. 'Craft' originates from Old English 'cræft', meaning 'skill, strength, or art'.

'sumptuously' developed from Latin 'sumptuosus' into Middle English via Old French influences to mean 'costly, lavish'; 'crafted' is the past participle form of 'craft', an Old English word that has continued into modern English to denote skillful making. The compound phrase 'sumptuously crafted' arises from combining these elements in Modern English to describe objects made both luxuriously and skillfully.

Initially, 'sumptuous' related primarily to expense or costliness and 'craft' to skill or workmanship; over time the combined phrase came to specifically evoke the image of something produced with both luxurious materials/appearance and careful, high-quality workmanship.