Gemmology
Gemmology
28 May 2024
28 May 2024
Stabilised Aquamarine Cabochon with Unusual Colouring
Recently, the authors examined a 17.20 et greenish blue oval cabochon that exhibited a noticeably blurry, uneven colour distribution (Figure 18). lt had a spot RI of 1.57, as...
Gemmology
5 April 2024
5 April 2024
Yellow sapphire with unstable colour centre
Fig. 1: Yellow sapphire of 4.57 ct with a unstable colour. (A) shows the stone as it was submitted for examination, (B) after a fading test under a strong lamp for 15 min, (C)...
Gemmology
6 February 2024
6 February 2024
Violet-pink coloured garnet with blue apatite inclusions
Purple-pink coloured garnets with blue apatite inclusions have been on the market for some time and are becoming increasingly popular. The garnets come from a location in...