Small Love Key Charm Pendant Necklace with Diamond, 24kt Solid Gold by Prehistoric Works of Istanbul, Turkey. Diamond - 0.02cts. This key charm pairs well alone or with other coin amulet or charms. Measures small, 10mm x 34mm Miniature Charm Key Here Keys are symbols of opening and closing. Locks and keys affect our lives in various ways. Sometimes a key means the difference between freedom and incarceration, or life and death. Keys also affect our lives in other ways; they give us security – we can lock our door and know that no one else has the key.