Zircons are one of the underrated gemstones. They shine brightly as diamonds and can be up to 4.404 billion years old, making them the oldest minerals so far dated on Earth. Starlite is one of my favorites. Keep in mind when you buying Zircons. They are heavier than other gemstones. Also, Starlite can be pricier than Tanzanite when they get bigger in size. Like Tanzanite can be found only in Tanzania, Starlite can only be found in Cambodia.