Can anyone tell me what these stones are called, they appear whitish but have the orangle glow at different angles, I am not seeing any specks. The stone is smooth to the touch but it looks like the color is faceted? They are very old, screwback. Held a 10k acid test for about 5-6 seconds then faded. I am talking about the largest middle stone??
The glass gem known as opalite (or sometimes, opaline) always shows that sort of hue when viewed through. Which I also agree these are.The center one may appear different because it looks like it has a foiled back.
If they were moonstone there would (should!) be a flashy schiller effect (and most probably be very included as well). And Fire opal, while very often displaying no actual play-of color-"fire", as neither do these, is so named simply because of its base body color - which varies from yellow to orange to cherry red.
JFTR: The masses of people who list opals, however "fiery" they may be, that are not Fire opals as such, frustrate anyone actually searching for them and should be pilloried!
