Celebrate your Gemini nature with this Gemini Zodiac Birthstone Crystal . This gift box contains agate, which embodies many aspects of the sign. Agate is said to stabalise the aura and both transform and eliminate negativity. Gemini is ruled by Mercury and symbolised by the Twins. It lasts from May 21st to June 20th. Geminis are said to be versatile but can be superficial and too inquisitive. This zodiac birthstone would make a great gift for people born under the sign of Gemini. It is a great way to feel connected to yourself and your star sign.