Lost diamond heart shaped necklace

If anyone happens to come across a heart-shaped diamond necklace (small and sentimental!) that may have slipped away from me recently, please let me know. Last seen near Olympia Valley wedding venue in Petaluma on Memorial Day weekend (5/25) or Aggie Inn in Davis on graduation weekend (6/14). It is very sentimental and I have proof of ownership if found! Long shot, but fingers crossed!