Red jasper

What it actually is

Chalcedony, silicon dioxide, with enough iron oxide and clay included to make it fully opaque. Hardness 7, no cleavage, trigonal.

Jasper is defined by that opacity rather than by a specific composition, which is why there are so many jasper varieties and so many jasper trade names. Red jasper takes its colour from hematite; yellow and brown jaspers from other iron oxides; green jaspers from chlorite and other inclusions.

Because jasper often forms by replacement, where silica-rich fluid gradually took the place of an existing rock, it can carry the patterning of whatever it replaced. That is where picture jasper, orbicular jasper and the many patterned varieties come from.

It is one of the few stones in the catalogue that is essentially never treated, because there is nothing useful to do to it.

Where it comes from

India is a major modern source, along with Brazil, Russia and the United States. Egypt's Eastern Desert supplied the ancient Egyptian trade, and jasper deposits occur worldwide because the formation process is common.

One setting is worth naming because it explains the stone's ubiquity around the Mediterranean and the Near East. Ophiolite sequences, slabs of oceanic crust thrust up onto land, carry red jasper alongside chalcedony and copper ores, so wherever ancient metalworking followed an ophiolite the red stone was already underfoot.

Egyptian use goes back to the Predynastic period. Red jasper appears in scarabs, in inlay and above all in the tyet amulet, the knot of Isis, which spell 156 of the Book of the Dead specifies should be of red stone.

Roman signet rings and intaglios used red jasper widely, and it appears in early Christian and Byzantine carved gems.

The material's ubiquity is part of its history: everywhere people were working stone, some form of jasper was available.

What the traditions claimed

Egyptian practice is the strongest thread. The tyet in red jasper was placed at the throat of the mummy and connected with the blood and protection of Isis, and its funerary use is specified rather than inferred.

Greek and Roman writers give jasper protective claims. Pliny lists many varieties and notes their use as amulets, and later lapidaries credit jasper with protection in childbirth, with driving away evil dreams, and with defence against poison and snakebite.

Marbode's medieval verses give jasper broad protective virtue and note it as a stone for those who must travel.

Modern practice reads red jasper as a grounding and endurance stone, sometimes called the stone of endurance, and that reading is closer to the older use than most modern assignments are.

The consistent thread across four thousand years is not power but reliability: a plain, tough, ordinary stone for ordinary protection.

How it is worked with

This is the practical stone in the catalogue. It costs very little, it is hardness 7 with no cleavage, it will not fade, it cannot really be damaged in normal use, and it is not worth faking.

Modern practice uses it for endurance, for grounding, and for sustaining effort over a long period rather than for bursts of courage, which suits it better than the red ray's usual crisis framing.

A tumbled pebble in a pocket is the right form, and it is the stone to buy if you want something to carry every day for a year without thinking about it.

For anyone put off by the price and treatment questions surrounding fine gems, red jasper is a reminder that the tradition ran on cheap, plain material for most of its history.

Buying it honestly

Red jasper is rarely faked because it is cheap. What does happen is renaming.

A very large number of jasper trade names describe attractive material from a particular deposit rather than a distinct mineral. That is harmless when the price matches, and misleading when a locality name is used to imply rarity.

Dyed and reconstituted jasper exists, and some material sold as red jasper is dyed howlite or a dyed magnesite composite. Hardness separates them at once: a steel pin scratches howlite and not jasper.

Some brightly coloured jaspers, particularly in blues and purples, are dyed, since those colours do not occur naturally in the material at that saturation.

Bloodstone is the closely related green-with-red variety and is sometimes sold interchangeably.