Red garnet pendant / necklace, Though both rubies and garnets are beautiful red stones, you really don’t want to confuse the two. Specifically, you don’t want to pay for a ruby and wear a garnet. They looks very similar. However, rubies are considered one of the most valuable gemstones whereas garnets are, well, not. Rubies are harder, a much more brilliant red, and much more expensive. Anyhow, Red Garnet with great design like this one, can also be nice as rubies.