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Golden beryl, also known as heliodor, is a gemstone that ranges in color from lemon-yellow to deep golden-yellow. It is a variety of the mineral beryl, with a chemical formula of aluminum beryllium silicate (\(Al_{2}Be_{3}Si_{6}O_{18}\)), and has a hardness of 7.5 to 8 on the Mohs scale. This durable gemstone has a vitreous luster and can be transparent to opaque.

Key characteristics Color: The color can range from a faint yellow to a rich, golden-yellow, sometimes with hints of orange. The hue is caused by trace amounts of iron. Hardness: 7.5–8 on the Mohs scale, making it durable for jewelry. Chemical composition: Aluminum beryllium silicate (\(Al_{2}Be_{3}Si_{6}O_{18}\)). Crystal structure: Forms hexagonal prisms. Luster: Vitreous or waxy. Specific gravity: 2.67–2.87. Refractive index: 1.565–1.602. Cleavage: Indistinct. Fluorescence: Typically does not fluoresce. Clarity: Can vary from transparent to opaque; it is often found with very few inclusions. Other notes: Golden beryl is also referred to as heliodor, a name derived from the Greek for "gift from the sun". It is sometimes misleadingly called "yellow emerald," but this is incorrect as emerald is specifically the green variety of beryl. It can fade if exposed to strong sunlight for long periods, so it should be stored away from direct light