The May Precious stone is Emerald
It also symbolizes twentieth and thirty-fifth wedding anniversaries.

https://amzn.to/3JOn01u Emerald is a type of beryl, a mineral with the chemical formula Be3Al2(SiO3)6. Beryls are colorless when pure and are referred to as “goshenite.” The mineral becomes green due to trace quantities of vanadium or chromium. Depending on its level of oxidation, trace levels of iron can give emerald a blue green or yellowish green tint.

Since ancient times, emeralds have captured people’s hearts and thoughts. Their rich green color, which is evocative of fresh spring growth, inspires both enthusiasm and calm.  “Smaragdus,” which meaning green in ancient Greek, is where the name “emerald” originates. Emeralds were referred to as “nothing greens greener” by Pliny the Elder of Rome. It was thought that their calming green hue would reduce fatigue and eye strain.

At least 330 BC, Egypt was home to the first known emerald mines. https://amzn.to/3JL6BL2

Cleopatra’s own emerald jewelry demonstrated her love for these precious stones. In the sixteenth century, Spanish explorers found emeralds in South America. They had already been used for 500 years by the Incas in their jewelry and sacred rituals.

https://amzn.to/44rb5jy Now mined in Zambia, and Brazil as well as Columbia.  They have also been found in Wyoming and North Carolina, South Carolina, Massachusetts, New Mexico, Montana, Nevada, Maine, Connecticut, Utah, and California.

Emerald green, a color associated with harmony and balance, is notable for its brilliance and elegance, lending sophistication and freshness to any environment. This color is as elegant as it is energizing. It is both bright enough to inspire a sense of calm and deep enough to create a cozy atmosphere. For this reason, people treasure this vivid green color for its distinct appeal.