Note 3163 — BOOK XXXVII. THE NATURAL HISTORY OF PRECIOUS STONES.
John Bostock translation
He is probably speaking here of violet Fluor spar; Oriental amethyst, or violet sapphire, it is next to impossible to engrave.
John Bostock translation
He is probably speaking here of violet Fluor spar; Oriental amethyst, or violet sapphire, it is next to impossible to engrave.