Gem Silica – The Rarest Form of Chalcedony

Gem silica is a gemstone admired for its blue-green coloring and translucence. Formed in cavities and fracture fillings of rocks above and adjacent copper deposits, this secondary mineral has impeccable saturation and depth, setting it apart as a true collector’s item. It’s also high in demand among in-the-know designers and lapidarists because of its rarity and ability to add a sense of je ne sais quoi to jewelry and ornamental pieces.

Gem silica properties:

• Color: Bright blue to vivid green
• Luster: Waxy to vitreous
• Transparency: Translucent to opaque, depending on the specimen
• Hardness: Mohs 7

Interesting details: Gem silica forms under very specific conditions in copper-rich environments, making high-quality specimens extremely limited. Ancient cultures often mistook it for turquoise due to color similarities, but they later realized that gem silica was more durable and had better clarity, which are ideal qualities for carving and adornment.

Gem silica is so rare that you will probably never see it in jewelry stores. That’s why we source it ourselves and make it available to our customers. If you’re not a jeweler, you can still purchase gem silica and find a jeweler who can transform it into a custom piece for you.

Gallery TCR’s gem silicas for sale are handpicked based on color, clarity, and weight. Such high-quality pieces sell fast because they aren’t easy to find. If you’re looking for a standout stone to complete a design or add to your collection, now’s the time to act. Browse our top-grade selection and secure a piece before it’s gone.