Individuals born between May 21 and June 20 fall under the zodiac sign Gemini. Gemini is an air sign associated with qualities such as adaptability, curiosity, and communication. Several gemstones are traditionally linked to Gemini, believed to enhance the energies and characteristics of this sign. Some gemstones associated with Gemini include:

1. Agate: Agate is believed to help Geminis enhance their analytical abilities and balance their dual nature. It is also associated with improved communication and creativity.

2. Citrine: Citrine is a gemstone associated with mental clarity, creativity, and abundance. It is believed to help Geminis stay focused and positive.

3. Chrysocolla: Chrysocolla is associated with communication, expression, and soothing energy. It is believed to help Geminis express themselves more effectively.

4. Moonstone: Moonstone is associated with intuition and emotional balance. It can be beneficial for Geminis seeking to harmonize their dual nature and navigate their emotions.

5. Tiger's Eye: Tiger's Eye is believed to enhance focus, determination, and confidence. It can be helpful for Geminis in staying grounded and overcoming indecisiveness.

6. Aquamarine: Aquamarine is associated with clear communication and is believed to help Geminis express themselves more effectively. It also has a calming influence.

It's important to note that these gemstone associations are based on traditional beliefs and metaphysical practices, and there's no scientific evidence supporting their efficacy. If you're drawn to the symbolism or properties of a particular gemstone, it may be a meaningful choice for you. Personal preference and resonance with the stone are essential factors to consider when selecting gemstones.