Aries and Gemini Compatibility: Is Fire & Air a Good Match in Astrology? It is believed that gemstones have great significance in astrology because wearing them helps to overcome many difficulties. Like Diamond is a gemstone for Aries so it helps them to bring strength, courage & clarity but due to its high prices it was quite difficult for people to avail it but they can avail of its alternatives like Aquamarine, Amethyst, Carnelian, Malachite & many more, which provides the same benefits of diamond to Aries borns.