Which of the following garnets can be orange in color?

Spessartine garnet is well-known for its vibrant orange color, which can range from a yellowish-orange to a deeper, more intense hue. This unique coloration is primarily due to the presence of manganese in its chemical composition, which significantly influences its color range. Spessartine can often be found in metamorphic rocks and is prized in the gem market for its striking and lively appearance.

In contrast, while other varieties of garnet such as pyrope, demantoid, and almandine may exhibit a variety of colors, including red and green, they are not typically associated with an orange hue. Pyrope garnets are predominantly red, demantoid is notably green, and almandine tends toward darker reds and purples. Therefore, spessartine is the distinctive garnet that can display an orange color, making it the correct answer.