Valentine's Day doesn't have to last just one day! Come see the $1.4M, 4.71ct "Cassel" purple-pink diamond (circa 1900 and set in rose gold with pink diamonds), plus a Renoir, luxury menswear, prestige beauty (Rosines des Parfums, Ligne St Barths skincare), travel (Gstaad and St Barths), at Salon Toute de Suite this Wednesday, 11am to 5pm, at the Michael Reslan Penthouse at 689 Fifth Avenue (enter 54th St., between Fifth/Madison). Kusmi Tea, La Columbe coffee, sweets and treats from Etrusca Restaurant.