Free tool
Gemstone Calculator
Look up which graha a stone belongs to, or read the stone your own lagna lord asks for — with the source and the traditional cautions on every card.
Which planet does a stone belong to?
Type a stone - or a planet - and get the pairing, with no birth details needed.
Or read it from your chart
The primary stone follows your lagna lord, so this needs your birth date, time and place.
Don't know it? Leave blank - we'll read your chart for noon.
No signup needed. We never share your details.
Every stone in the catalog, by graha
Sun
- Ruby (Manik) (Primary stone)
- Red Garnet (Substitute)
- Sunstone (Substitute)
- Red Spinel (Substitute)
Moon
- Pearl (Moti) (Primary stone)
- Moonstone (Substitute)
- White Sapphire (substitute) (Substitute)
- Clear Quartz (Sphatik) (Substitute)
Mars
- Red Coral (Moonga) (Primary stone)
- Carnelian (Substitute)
- Bloodstone (Heliotrope) (Substitute)
- Red Jasper (Substitute)
Mercury
- Emerald (Panna) (Primary stone)
- Peridot (Olivine) (Substitute)
- Green Tourmaline (Substitute)
- Green Jade (Substitute)
Jupiter
- Yellow Sapphire (Pukhraj) (Primary stone)
- Yellow Topaz (Substitute)
- Citrine (Substitute)
- Golden Beryl (Heliodor) (Substitute)
Venus
- Diamond (Heera) (Primary stone)
- White Sapphire (Substitute)
- White Zircon (Substitute)
- Opal (Substitute)
Saturn
- Blue Sapphire (Neelam) (Primary stone)
- Amethyst (Substitute)
- Lapis Lazuli (Substitute)
- Iolite (Neeli substitute) (Substitute)
Rahu
- Hessonite Garnet (Gomed) (Primary stone)
- Honey Quartz (Substitute)
- Tiger's Eye (Substitute)
- Agate (Hakik) (Substitute)
Ketu
- Cat's Eye (Lehsunia) (Primary stone)
- Chrysoberyl (Substitute)
- Smoky Quartz (Substitute)
- Quartz Cat's Eye (Substitute)
How a gemstone is chosen in Vedic astrology
The classical rule is not 'a stone for your sign'. It is a stone for a PLANET, and the planet that matters most is your lagna lord - the ruler of the sign rising at the moment you were born. Aries rising makes Mars your lagna lord; Mars's stone is red coral, so red coral is the primary recommendation for that chart and not for a Taurus rising, whose lord is Venus.
That is why a gemstone answer needs a birth time at all. The lagna changes sign roughly every two hours, so two people born the same day in the same city can have different lagna lords and different primary stones. Anything that recommends a stone from your date alone has skipped the step that does the work.
Alongside the lagna lord, the tradition prescribes stones for grahas the chart shows as debilitated or afflicted. Those are separate recommendations with separate cautions - not upgrades to the primary one.
How to read your result
The headline card is the stone for your lagna lord. Under it sit substitutes: cheaper stones the tradition treats as carrying the SAME graha. That word matters - a substitute is not a weaker version of the primary stone, it is a different mineral standing in for the same planet, and several traditions consider the substitute the safer option precisely because it acts more gently.
Below that, if your chart has them, come stones for afflicted planets. These answer a different question from the primary stone. The primary supports the ruler of your whole chart; an affliction stone addresses one graha that the chart shows under pressure. Wearing both is a decision, not an obvious sum.
Every card carries a source line and, in English, the contraindications the tradition attaches. Read those before the description. The cautions are the part most gemstone pages leave out, and they are the part that changes what you should actually do.
A worked example
Take the chart used across these pages: born 15 April 1990 in Mumbai, Aries ascendant. Aries is ruled by Mars, so Mars is the lagna lord and the primary stone is Red Coral (Moonga) - set, traditionally, in gold or copper, and cited to BPHS ch. 70 and the Mani-pariksha chapter of the Brihat Samhita.
The caution attached to that stone is specific and easy to miss: red coral is not paired with pearl, because Mars and the Moon are read as antagonistic. Someone wearing a pearl for emotional steadiness and then adding coral for drive has, by the classical rule, put two hostile grahas on the same hand.
The substitutes for the same Mars are carnelian, bloodstone and red jasper, in descending order of how often the texts cite them. And if that chart also showed Saturn afflicted, a separate recommendation appears - blue sapphire - which is the single stone the tradition hedges hardest about, and the tool shows those hedges rather than the sales pitch.
Method and provenance - including what has not been checked
The lagna and the lagna lord come from a Swiss Ephemeris computation of your chart, sidereal with the Lahiri ayanamsa - the same computation behind every other tool here. That part is arithmetic and we stand behind it.
The stone catalog is a different kind of thing. All 36 entries are paraphrased from named traditional sources - the Brihat Parashara Hora Shastra, the Brihat Samhita, the Garuda Purana and the Padma Purana - and each card prints the citation for the specific stone rather than a general bibliography, so you can take any single claim back to its text.
What we will not claim: none of it has been reviewed by a credentialed astrologer. Every entry is flagged in our own data as pending that review. We would rather state it plainly than let a clean interface imply a vetting that has not happened - and it is the reason this page frames its output as sourced tradition to check with a teacher, not as a prescription to act on.
What this tool does not tell you
It does not tell you to wear anything. A gemstone recommendation in the classical literature is one option among several remedial approaches, and the texts themselves disagree about when a stone helps and when it intensifies exactly the planet you wanted to quiet.
It is not medical, financial, legal or relationship advice, and no result here carries an outcome. There is no timing attached, no fortune, and no warning about anything that will happen to you.
It also cannot judge the stone in your hand. Weight, quality, treatment and setting are the questions a jeweller answers, and the tradition's own rules about them are more demanding than its rules about which mineral belongs to which graha. This tool answers only the second question.
And it depends entirely on your birth time. The primary stone follows the lagna lord, the lagna moves about one sign every two hours, and an unknown time means the tool reads the chart at noon - which can name a different stone altogether. It says so on screen when that happens.
Frequently asked
- Which gemstone should I wear according to my date of birth?
- Strictly, date of birth alone is not enough. The primary stone follows your lagna lord — the ruler of the sign rising when you were born — and the lagna changes roughly every two hours, so the same date can give different stones depending on the time and the city. Enter date, time and place and the tool names the stone from your actual lagna lord rather than guessing from your sign.
- Which planet does tiger's eye belong to?
- Rahu, in the catalog this tool uses — as a tertiary stone, meaning a substitute rather than the primary. Rahu's primary stone is hessonite garnet (gomed). You can check any stone this way with the lookup at the top of the page; it needs no birth details.
- What is the difference between a primary stone and a substitute?
- They carry the same planet. A substitute (upratna) is a cheaper mineral the tradition accepts as standing in for the primary — carnelian for red coral, amethyst for blue sapphire, and so on. It is not a weaker or lower-quality version of the primary stone, and several traditions actively prefer substitutes because they are read as acting more gently.
- Why do different sites give me different gemstones?
- Usually because they are answering a different question. Some recommend from the Sun sign, some from the Moon sign, some from the birth number, and some from the lagna lord — which is the classical rule this tool follows. They will disagree, and none of them will tell you which rule they used. We say which one we used and cite the text for every stone.
- Is blue sapphire really risky?
- The tradition treats it as the fastest-acting and the most conditional of the nine, and the cautions in the catalog reflect that rather than softening it. Those cautions print on the card when the stone appears in your result. Whether that means you should avoid it is not a question a calculator can settle — it is exactly the point at which a text should be read with someone who knows your chart.
- Has an astrologer checked these recommendations?
- No, and we would rather say so. The catalog is paraphrased from named classical sources and each entry is cited, but every one of them is marked in our data as pending review by a credentialed astrologer. Treat the output as sourced tradition you can verify against the text, not as a vetted prescription.
- Can I use this without entering my birth details?
- Yes. The lookup at the top of the page answers 'which planet does this stone belong to' — and the reverse, 'what is the stone for this planet' — entirely from the catalog, with no birth data and no signup. Only the chart-based recommendation needs your birth date, time and place.