18k solid yellow gold is $809.34, the store credit of your order after 15% restocking fee is $643.82 (757.43-15%). so the price difference is $165.52 (809.34-643.82)
XR0324A: 3ct FG Elongated Oval Astro Cut/ 18k yellow gold/ size 4.25/ Engraving：
S&F 4/27/24