Lily
Represents purity. On a gravemarker this purity can reflect the transition of the earthly to the spiritual. May also be a symbol of chastity.
Lyre
A bridge between heaven and earth. My also reflect musical abilities.
Pine Cone
Immortality from the evergreen tree. Incorruptability from the sap.
Oak
A sacred tree for many cultures, it symbolizes strength,honor, virtue. In Christain symbolism it represents enduring faith. Also an important symbol in pre-Christian pagan religions.
Rose
A reminder that the soul achieves its most perfect state after physical death. A symbol of the blood of Christ.
Star of David
Represents the Jewish faith.
Tree granite headstone
Represents life. With a broken branch,represents mortality.
Some useful articles on the production and manufacture of tombstones
HOW IS THE HEADSTONE PRODUCED?
How do you make a granite headstone?
Why do headstones take so long to make?
How long does it take to create a headstone?