The oldest sourced list of sign stones works down the circle, reaches Pisces, and leaves the line empty, which may be the most honest entry anyone ever wrote for the sign. What a shop gives for the blank is aquamarine, moonstone, amethyst and bloodstone, and none of the old lists names any of the four.
George Frederick Kunz reproduced an old Spanish list in his 1913 chapter, taken from a treatise printed at Valladolid in 1604, and unlike most of what surrounds it he gave the list a proper citation. It runs through the signs in order. Aries gets crystal. Taurus gets ruby and diamond. It works down the circle, sign by sign, and when it reaches Pisces it stops. The line is printed and the space after it is empty.
Whether the compiler had nothing to put there, or the printer dropped the entry, or the copy Kunz worked from was damaged, nobody has established. What can be said is plain enough: the oldest sourced sign-stone list in the standard reference on the subject has no stone for Pisces at all.
The list that stops at the twelfth sign
That blank is worth more than most of the entries that are filled in, because it is the one place in the whole tradition where a compiler declined to invent.
Set the three historical answers for Pisces side by side and the picture is thin even by the standards of a thin subject. Agrippa, in his 1533 table, gives sapphire. Kunz’s own list of 1913 gives amethyst. The 1604 Spanish list gives nothing. Modern crystal practice gives aquamarine, which is in none of them. One source says sapphire, one says amethyst, one says nothing, and the stone people actually buy is a fourth answer with no old claim behind it.
Two of those three are barely even independent. Agrippa’s table prints the twelve signs, the twelve months and twelve stones as three rows of one grid, so his sapphire sits under Pisces and under February in the same column and is a calendar entry wearing a second label. Kunz’s list, compared with his own table of month stones a chapter away, is that table shifted by one position, because the signs begin near the twenty-first rather than the first. So of the three, one is a month list relabelled, one is another month list relabelled, and one is blank. Every list since has filled the empty space, and none of them agrees about what belongs in it. The compiler who left it empty is the only one who did not pretend to know.
A blank in a printed table is not a small thing to leave. Type was set by hand, a line with nothing on it drew the eye, and the easy move for a compiler was to reach for a plausible stone and fill the gap so the page looked finished. Whoever set the 1604 list did not do that. The restraint is worth more than a guess would have been, and it is the one moment in four hundred years of sign-stone writing where a source tells the reader, without saying so, that it has run out of tradition to hand on.
Sapphire, and the one thread that holds
There is a single layer of this that does hold up, and it belongs to the planet rather than the sign.
Ptolemy assigns Jupiter to Pisces in the second-century Tetrabiblos, and stones were tied to planets in ways that can be dated. Marsilio Ficino, writing in 1489, names sapphire as Jupiter’s stone directly. So Agrippa’s sapphire for Pisces is not arbitrary: it is a Jupiter stone landing on a Jupiter sign, and the fuller working of how a planet’s stones get read onto the signs it rules sits on the Sagittarius page, Jupiter’s other sign. What that thread does not reach is the modern list, because sapphire dropped off it entirely and aquamarine, which no planet source names, took the lead. Kunz’s own answer, amethyst, has the same shape as Agrippa’s. It is February’s birthstone, and Pisces opens in the third week of February, so his zodiacal amethyst is his month table showing through once again. Two of the three old answers for the sign, sapphire and amethyst, turn out to be the calendar seen from two angles, which leaves Pisces with no attribution that did not start life as a month.
The modern reassignment of Pisces from Jupiter to Neptune, which most contemporary astrology now uses, has no traceable author at all: no date, no name, no citable account of when the rulership moved. That is not an argument against it. It is one more case, in the same tradition, of a change everyone repeats and nobody can source.
Aquamarine, by March and by colour
Aquamarine reaches Pisces the way most modern sign stones reach their sign, partly by the calendar and mostly by looking right.
Pisces ends in the third week of March, so it collects March’s birthstone, and here the trade’s own story needs correcting. It is very widely written that bloodstone was the original March stone and that aquamarine was promoted over it in 1952. No authority documents that. The 1952 revision added alexandrite, citrine, tourmaline and zircon, and said nothing about March. What is documented is a live disagreement in the present: Jewelers of America now lists aquamarine alone for March, while GIA and the American Gem Society keep bloodstone beside it. Three authorities, one month, two answers, in 2026.
The colour is doing the rest, and doing more than the calendar. Pisces is a water sign, and aquamarine is a pale blue-green that people reach for the word water to describe, which is where the name came from to begin with. That is a genuine reason for a pairing and it is not a tradition.
The name suggests a species and there is not one. Aquamarine is the blue to blue-green variety of beryl, and beryl is the species, hexagonal, Mohs 7.5 to 8, with an imperfect basal cleavage that makes it hard-wearing rather than indestructible. Emerald is the same mineral in green, and the reason emerald is fragile while aquamarine is not comes down to treatment rather than mineralogy: GIA notes that most emerald is fracture-filled, and the fractures, not the beryl, are the weakness. Moonstone is an adularescent alkali feldspar, and the Handbook’s orthoclase entry allows only that it may show opalescence or schiller iridescence. Bloodstone is chalcedony, so quartz at a fine grain, its red flecks iron oxide rather than anything organic. Amethyst is purple quartz, and it is the one stone on the list GIA warns will fade, since some amethyst loses colour under prolonged strong light. A light Brazilian piece that pales toward its matrix, the ordinary run of the stone, is exactly the kind to keep out of a sunny window.
None of the four can be looked up under the name a shop sells it by, which is why the Crystalance Mineral Library files them under beryl and feldspar and quartz, with no page for aquamarine or bloodstone at all. Four hundred years ago someone compiling a complete set reached the twelfth sign, had nothing to write, and wrote nothing. No two authorities have agreed on what belongs in that space in the four hundred years since, and the aquamarine a shop sells for it now is one more answer to a question the sign’s own oldest source left open.
Sources
- George Frederick Kunz, The Curious Lore of Precious Stones, 1913, chs. IX and X, and the Morales list at p. 347: gutenberg.org
- Cornelius Agrippa, Three Books of Occult Philosophy, Book II ch. XIV, 1651 translation of the 1533 original: archive.org
- Ptolemy, Tetrabiblos I.17, Robbins translation, on the houses of the planets: penelope.uchicago.edu
- Marsilio Ficino, De vita libri tres, Book III, on sapphire and Jupiter, Lyon 1560: archive.org
- Jewelers of America, birthstones by month: jewelers.org
- National Jeweler, on the 1952 revision and the birthstone list’s history: nationaljeweler.com
- GIA, amethyst care and cleaning, on fading in strong light: gia.edu
