Bio Lemon Citrus Spark: The Zest of this Gem Energizes Bio Lemon is a type of quartz, a semi-precious stone renowned for its diverse array of colors and varieties. Its most prominent feature is its unique yellowish-green hue, ranging from delicate lemon tones to rich golden shades. This distinctive coloring arises from mineral traces like iron oxides or hydrocarbons embedded within the gemstone structure, which become apparent when the stone is cut and polished into faceted gems for jewelry applications.