How to Identify Red and Pink Gemstones
Last updated: October 2026
54 of the 132 gem species in our database occur in red or pink. Colour tells you where to look; it cannot tell you what the stone is. Two more observations cost nothing — how much light passes through it, and how its surface shines. Below is exactly how far those two get you, counted over every red or pink species we hold, and where you need an instrument to go further.
Step 1 · How much light passes through it
Hold the stone up to a light. A species recorded in more than one state is counted in each, so these add up to more than 54.
| Transparency | Red and Pink species |
|---|---|
| Transparent You can clearly see through it | 40 |
| Translucent Light passes through but you cannot see clearly | 34 |
| Opaque No light passes through, even at thin edges | 18 |
Step 2 · How its surface shines
Tilt a flat polished face toward the light and judge the shine. Every combination of the two observations that any red or pink species shows, largest first:
Where your eyes stop
If your stone is genuinely red or pink, transparent, with a vitreous lustre, it is still one of 32 species. No amount of looking separates those reliably, because they differ in properties you cannot see: density, refractive index, optic character. A measurement does.
The cheapest useful one is often not the refractometer. Our gem testing kit comparison ran all 132 species through the identification engine to rank inexpensive instruments by how much each eliminates. If you have a refractive index reading, the red or pink section of the RI-by-colour chart lists every candidate above sorted by it, and the confusion pairs reference gives the test that separates each commonly confused pair.
The app asks these same three questions. Transparency and lustre remove species; colour only moves red or pink species to the top, because colour shifts with lighting and treatment and a wrong call should not throw out the right answer. Then it shows which test would eliminate the most of what is left. It needs observations or measurements; it cannot identify a gem from a photo.
Open the appFrequently Asked Questions
Can you identify a red or pink gemstone by its colour?
No. 54 of the 132 species in the Loupewise database occur in red or pink, so colour tells you where to look, not what the stone is. Adding transparency and lustre — both free to observe — still leaves up to 32 candidates in a single group (transparent, vitreous). Separating those takes a measurement such as specific gravity or refractive index.
What is the cheapest way to narrow down a red or pink gemstone further?
A measured property. Specific gravity can be taken with a kitchen-scale setup, and a refractometer reading is the sharpest single cut. Our gem testing kit article ranks the inexpensive instruments by how many species each one eliminates across the whole database.