gemstone

Polished Bloodstone (likely dyed agate/jasper)

Cryptocrystalline quartz, SiO₂; commonly chalcedony with iron-oxide inclusions

AI-generated identification · may be incorrect

Smooth tumbled stone with dark green-black, cream, and reddish-brown bands or zones; waxy to vitreous luster. Quartz hardness is about 6.5–7 Mohs, with no cleavage and conchoidal fracture; exact appearance suggests possible dyeing or a composite identification.

Identified September 6, 2026More gemstone →

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Physical properties

Formation & geological history

Natural chalcedony forms when silica-rich groundwater fills cavities and fractures, later acquiring iron-oxide coloration; deposits are commonly Paleozoic to Cenozoic, though age varies by locality. The polished shape is human-processed.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and inexpensive decorative specimens; historically, bloodstone has been used for seals and signet jewelry.

Geological facts

True bloodstone is typically green chalcedony containing scattered red hematite or jasper spots, not broad sharply separated color bands. This specimen may instead be a polished, dyed banded agate or jasper.

Field identification & locations

Identify by its glassy/waxy surface, very fine grain, lack of visible crystals, and ability to scratch ordinary glass; a streak, dye, or acid test can help distinguish varieties. Common sources include India, Brazil, Madagascar, and Australia.