Gemstone Recommendation by Lagna Lord
The life stone (janma ratna) is prescribed for the lord of your lagna — the planet that rules the chart as a whole. That is a calculation, not a matter of preference or of what a shop has in stock.
Three things decide a gemstone: the lagna lord, the planet you want to strengthen, and the planets you must not strengthen. The first is fixed by your rising sign and is what this page computes. The second and third need a full chart reading.
Two stones carry warnings in the tradition itself. Blue sapphire (neelam) is trialled for three days before permanent wear because Saturn acts fast in either direction. Diamond is not recommended when Venus is a functional malefic for your lagna. Never buy either on a shopkeeper's advice alone.
Questions
Can I wear any gemstone I like?
Not safely, in the classical view. A stone amplifies its planet, so strengthening a planet that is a functional malefic for your lagna is held to make matters worse, not better.
Do substitutes work?
Upratna (substitutes) are the traditional answer to cost. They are considered weaker and are usually worn in a larger weight.
Does a gemstone replace effort or treatment?
No. It is a classical recommendation, not a medical or financial instrument, and the tradition never presented it as a substitute for either.
This is a classical astrological calculation, not medical advice. Nothing here diagnoses or treats illness. If something is wrong, see a doctor — the tradition itself prescribes remedies alongside treatment, never instead of it.