ADVANCED MODE β

Precision mode (beta)BETA

Enter refractive index, specific gravity, fluorescence and more — candidates are filtered in real time.

Colour (multiple allowed)

Refractive index (RI)Specific gravity (SG)

Tolerance:

Mohs hardness

MinMax

BirefringenceDispersion

PleochroismCrystal system

Optic character (polariscope)

Chelsea filter

UV-LW fluorescence (long-wave, 365 nm)

Intensity

Colour (ignored if intensity is 'inert')

UV-SW fluorescence (short-wave, 254 nm)

Note: short-wave UV damages eyes and skin. Use a dedicated lamp and UV-rated goggles.

Intensity

Colour (ignored if intensity is 'inert')

Candidates

No filters set

Enter the values you've measured on the left and the candidate list narrows in real time.
Empty fields are skipped (rated ◎ / △ / × / —).

After beta, this feature will move to a paid plan. Leave your email to hear about launch and any benefits offered to beta participants.