rom antic ', ▁more ▁natural ▁shapes . ▁The ▁Art ▁N ouve au ▁movement ▁of ▁ 1 8 9 0 - 1 9 1 0 ▁inspired ▁most ▁of ▁the ▁natural ▁forms ▁and ▁geometric ▁shapes ▁of ▁the ▁j ew el ry ▁during ▁the ▁ 1 9 2 0 s . ▁" A est h etic ▁clean ▁lines ▁were ▁inspired ▁by ▁designs ▁found ▁in ▁industrial ▁machines . ▁A ▁key ▁influence ▁of ▁this ▁modern ism ▁was ▁the ▁influ ential ▁Bau haus ▁movement , ▁with ▁its ▁philosophy ▁of ▁form ▁following ▁function . ▁Con tr ast ing ▁text ures ▁and ▁colour ▁were ▁also ▁in ▁fashion . ▁Ex amples ▁of ▁changing ▁t ast es ▁in ▁design ▁were ▁the ▁use ▁of ▁diam onds ▁being ▁set ▁against ▁on y x ▁or ▁trans ▁luc id ▁vit r ines ▁and ▁am eth yst s ▁ju xt ap osed ▁against ▁op aque ▁cor al ▁and ▁j ade ." ▁Even ▁though ▁geometric ▁shapes ▁and ▁cleaner ▁sh aped ▁j ew el ry ▁were ▁now ▁a ▁tr end , ▁one ▁of ▁the ▁key ▁pieces ▁was ▁the ▁long ▁ro pe ▁p ear l ▁neck lace . ▁The ▁long ▁ro pe ▁p ear l ▁neck lace ▁was ▁a ▁signature ▁f aux ▁piece ▁that ▁was ▁sold ▁everywhere ▁at ▁the ▁time . ▁It ▁was ▁in exp ensive ▁and ▁basic ▁in ▁a ▁woman ' s ▁w ard ro be . ▁" Al though ▁buff et ed ▁by ▁cycles ▁of ▁bo om , ▁de pression ▁and ▁war , ▁j ew el ry ▁design ▁between ▁the ▁ 1 9 2 0 s ▁and ▁ 1