Your birth month’s birthstone

A birth month is one fact. A stone prescription in jyotish rests on four, and the month is not among them. The first is the lagna — the sign that was rising on the eastern horizon at the moment and the place of birth. Every house in a chart is counted from there, so the lagna is what decides which job each graha is holding before any stone is discussed at all.

From that starting point the tradition sorts the grahas by what they own. The lords of the 1st, 5th and 9th houses are the ones whose stones are held to help; the lords of the 6th, 8th and 11th are the ones it leaves alone. That is the rule the 12-row ascendant table on this site is built from, and it is the reason a stone list keyed to a sun sign and a stone list keyed to a rising sign disagree about the same person.

The disagreement is not marginal, and the table lets you count it. Take Yellow Sapphire (Pukhraj), which the site’s own stone notes call the safest of the nine to wear and therefore the most over-prescribed. Across the twelve ascendants it sits on the helpful list for 6 of them — Aries, Cancer, Leo, Scorpio, Sagittarius and Pisces — and on the leave-alone list for the other 6, because for those the same graha owns a house the tradition does not strengthen. Blue Sapphire (Neelam) divides them almost as evenly, 6 to 5, with 1 on neither list. Same stone, same graha, opposite advice, and the only thing that changed was which sign was rising.

Which is why the month runs out so quickly. All twelve signs rise in the course of one day — on average about two hours each, though the real spans differ by sign and by latitude — so two babies born in the same city on the same morning four hours apart do not share a lagna, and the table above would hand them the same stone anyway. A date on its own cannot fix it either. It takes a clock time and a place, which is what an ascendant calculator or a free kundli asks you for.

The remaining two facts are the condition of the graha in that particular chart — which house it actually sits in, which sign, and what is aspecting it — and which period is running, since the tradition prescribes for the dasha a person is in rather than for the chart in the abstract. The running period comes off the Moon’s nakshatra at birth, so it needs the same three pieces of birth data; the dasha calculator works it out. None of the four can be read off a calendar month, which is the honest reason this page shows you what the jewellers’ list says and then stops.

The Nine Ratna, and the Two That Sit Outside the Stone Table

The navaratna are nine stones, one to each graha. Every cell below is read from the data files rather than typed into this page.

Two features of that table are worth reading rather than skipping. The Sanskrit column is blank on the last two rows because the site’s stone table covers only the seven grahas that own signs; the node stones are recorded on the planets table instead, which is where their weekdays in the final column come from. And those weekdays are the detail most often printed wrong. Rahu’s is Saturday and Ketu’s is Tuesday — the same two days as Saturn and Mars — and a page that puts a node stone on Thursday has quietly borrowed Jupiter’s day, which has happened here in the past. If a page hands you a weekday for either node, it is worth checking against a table like this one.

What the nodes have no entry for anywhere is a finger or a metal, and that gap is deliberate rather than an oversight. The classical assignment of finger and metal runs through sign rulership, and Rahu and Ketu own no sign, so there is nothing to derive one from. A confident finger for Gomed is a lineage convention, not a rule out of the table that fixes the weekday, and it is fair to ask which lineage.

One more thing follows from the nodes owning nothing, and it is the reason a remedy goes backwards more often with these two stones than with any of the other seven. A ratna is held to strengthen its own graha — that is the premise the whole practice rests on — so a node stone worn in the hope of quieting a difficult node amplifies the placement instead. The gemstone reference spells the consequence out sign by sign.

Why the Tradition Keeps Substitute Stones

Beside each primary stone sits an upa-ratna, a substitute held to carry the same graha. This site records one for each of the seven sign-owning grahas: Carnelian for Mars, Opal for Venus, Green Onyx for Mercury, Moonstone for Moon, Red Garnet for Sun, Citrine for Jupiter and Amethyst for Saturn. They exist for a reason that is practical rather than mystical, and the stone notes say so in three separate places. Kashmiri Blue Sapphire is described there as legendary and effectively unavailable. The Basra pearl that is the classical ideal for the Moon is now largely historic. And the note on the Venus row is blunt about cost: white sapphire is the honest choice at a fraction of the price and carries the same graha as the diamond it stands in for. A prescription that can only be filled at the top of a jeweller’s range is one most people cannot fill at all.

The substitute column is one stone per graha with no stone shared between two of them, which is what makes it usable in the first place. Two entries in it are worth knowing individually, because both are places where a name does the misleading.

The first is topaz. Jupiter’s ratna is Yellow Sapphire (Pukhraj), and the substitute this site records for Jupiter is Citrine. Yellow topaz is neither of those. The quality note on that row puts it plainly: topaz is often mis-sold as Pukhraj, the two are different minerals, and topaz is not the substitute for Jupiter. The names have converged in the trade because both stones are yellow, which is exactly the confusion a substitute column exists to prevent.

The second runs the other way, and it is worth memorising because it appears on price lists. Safed Pukhraj — white Pukhraj — is the attested Indian trade name for white sapphire, and white sapphire is the second entry on the Venus row above: Diamond or White Sapphire. It is Shukra’s, not a pale grade of Jupiter’s. One adjective, two different grahas, and a shop that blurs them has sold you a stone for a planet you did not ask about.

Treated, Untreated, and What a Certificate Is Actually For

Start with a fact about minerals rather than about planets. Four of the nine ratna are the same mineral species: corundum. Ruby (Manik) is corundum coloured red, Blue Sapphire (Neelam) is corundum coloured blue, Yellow Sapphire (Pukhraj) is corundum coloured yellow, and the white sapphire that stands in on the Venus row is the same species with the colour absent — the data file calls it the near-colourless corundum substitute in as many words. Four grahas, one mineral, and the only thing separating them is colour.

That matters because colour is precisely what treatment changes. Heat is the common one: it is applied to almost all commercial ruby and is generally accepted in the trade, and the same heat turns amethyst yellow, which is the whole boundary between Amethyst and Citrine — the substitutes this site records for Saturn and Jupiter respectively, and both of them quartz. So two grahas’ substitute stones are separated by an oven, which is a good reason to ask a seller which of the two you are holding and whether it was heated. Other treatments are not accepted at all: glass or lead filling in ruby, heavy resin filling in emerald, and dye in coral, which is why the coral note warns that a glassy shine on an organic material means it is not coral.

A laboratory report answers three questions and no others. What species is this stone. Is its colour natural or the result of treatment. Is the stone natural or synthetic — and on that last one, lab-grown diamond is chemically identical to mined diamond, while the tradition holds that only a natural stone transmits the graha, so the two are not interchangeable here even though a physicist would shrug. None of those three questions is astrological. They are the questions that decide what the stone is worth in rupees, and you would want them answered when buying a stone for an ordinary ring with no jyotish anywhere near it. Reading this part of the page as consumer protection rather than as astrology is the correct reading.

Which is also the practical order to work in. Whether a graha should be strengthened is a question about a chart. Whether the thing in the box is the stone on the invoice is a question about a certificate. The second is answerable in a shop; the first is not, and no amount of paperwork about a mineral says anything about whether it was the right mineral to buy.

What an Actual Recommendation Needs

A birth month does not narrow a chart, and it does not even fix a sun sign: every tropical sign straddles two calendar months, so Aries runs Mar 21 – Apr 19 and Capricorn runs Dec 22 – Jan 19. Somebody born in the middle of a month and somebody born at the end of it can be different signs, and neither of them has a lagna until a clock time and a place are added.

So here is the whole list of what a stone prescription is built from, none of which this tool collects: a birth date, a birth time as exact as the family can recall or the certificate records, a birthplace, and from those the rising sign, the house each graha holds counted from it, the state that graha is actually in, and the period currently running. Three pieces of information, four readings derived from them, and a month is not one of the three.

What the finder above does is narrower than that, and more useful than a guess: it tells you which stone the jewellers’ list gives your birth month, and where an honest route exists it names the graha that stone happens to carry in jyotish. It declines the months where no such route exists rather than filling them in by colour. If you want the other thing — a stone chosen for a chart — the gem recommendation tool starts from a rising sign instead of a month, and one of our astrologers will read the chart before naming anything. Anyone naming a stone before the chart has been read is, at best, selling jewellery.