Most gemstone-selling sites skip the actual method entirely. Here is what a genuine recommendation is supposed to be based on.
✦ Get Your Free KundliA large share of gemstone-recommendation content online simply matches your Sun sign or Moon sign to a generic stone list — "Leo wears ruby," "Cancer wears pearl." That's a genuine starting point in some traditions, but it skips the actual individualized analysis classical practice calls for.
A proper gemstone recommendation identifies which specific planet is weak or needs support in your chart — through debilitation, affliction, or a difficult current dasha period — and recommends that planet's stone specifically, not a fixed stone based on your general sign.
This means two people with the same Moon sign can genuinely need different stones, because their charts' specific weak points differ — the sign-based generic list misses this entirely.
Whether the planet needing support is a genuine "friend" to your ascendant (wearing a stone for a planet that's functionally unfriendly to your chart can work against you), and whether the person is even currently in that planet's dasha period, where the effect would be most relevant.
Gemstone recommendation is a spiritual and traditional practice, not a scientifically verified medical or financial intervention — treat any recommendation, including your own, as a supportive practice rather than a guaranteed remedy, and be wary of any site pushing an expensive stone without first identifying which planet in your specific chart actually needs it.