chrysoprase
About
Chrysoprase is a vibrant green variety of chalcedony coloured by traces of nickel. Its bright, apple-green hue sets it apart from other green gemstones. Major sources include Australia, Brazil, Poland, and Tanzania.
Birthstones & Anniversaries
Chrysoprase is not a traditional birthstone but is associated with the zodiac signs Taurus and Libra, symbolising love, abundance, and emotional harmony.
Crystal Healing Energy
The overarching theme of chrysoprase is renewal and emotional healing. Believed to open and activate the heart chakra, chrysoprase is thought to promote forgiveness, compassion, and joy. It is often used for emotional balance, self-acceptance, and connecting with one’s inner truth. Its energy is said to inspire hope and encourage fresh beginnings.
Facts
Nickel Content: The unique apple-green colour of chrysoprase comes from nickel impurities within the quartz structure.
Historical Use: Chrysoprase was prized by ancient Greeks and Romans and was said to have been a favourite gemstone of Frederick the Great of Prussia.
Durability: With a Mohs hardness of 6.5 to 7, chrysoprase is durable enough for everyday jewellery use.
Geographical Sources: Australia is the leading producer of high-quality chrysoprase, followed by Brazil and Poland.
Science
Mineral: Chalcedony (quartz variety)
Crystal System: Trigonal
Chemistry: SiO₂ with nickel traces
Colour: Apple-green to deep green
Refractive Index: 1.530 to 1.539
Specific Gravity: 2.58 to 2.64
Mohs Hardness: 6.5 to 7
TreatmentsChrysoprase is typically untreated, but lower-quality stones may be dyed to enhance their green colour. High-quality chrysoprase with natural colour is highly valued.
SyntheticsNo known synthetics.
ImitationsDyed quartz and glass are commonly used as imitations for chrysoprase. These materials may mimic the colour but lack the translucency and nickel-derived natural hue of natural chrysoprase.
similar materialsJadeite: A green gemstone often mistaken for chrysoprase, but it is denser and has a different mineral composition.
Aventurine: A quartz variety that can also appear green but often contains shimmering inclusions of mica.
Green Opal: Similar in colour to chrysoprase but usually softer and more opaque.