Amazon offers this 14K White Gold Cultured Pearl Pendant Necklace for $119.15. Coupon code "CYBWEEK14" cuts it to $83.31. With free shipping, that's $226 off and the lowest total price we could find. It features a spring ring clasp and an 18" chain.
Amazon offers Prime members this Twisted Three-Strand Simulated Pearl 18" Necklace in Cream for $7.99 with free shipping. (Non-Prime members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $4.98.) That's $32 off list price and the lowest total price we could find. The pearls in this necklace range in size from 4mm to 12mm.