Strong’s Greek
G4552 — sappheiros
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
σάπφειρος σάπφιρος
sappheiros — pronounced sap'-fi-ros
of Hebrew origin (5601); a "sapphire" or lapis-lazuli gem:--sapphire. see HEBREW for 05601
1 occurrence in the KJV.
Revelation 21:19
And the foundations of the wall of the city were garnished with all manner of precious stones. The first foundation was jasper; the second, sapphire; the third, a chalcedony; the fourth, an emerald;