An amethyst and diamond ring, by Van Cleef & Arpels. Photo Christie's Image Ltd 2014.
Centering upon a cabochon amethyst with four diamond corners and square-shaped hoop, ring size 6, with French assay mark for gold, in dark blue Van Cleef & Arpels case. With maker's mark and signed Van Cleef & Arpels, no.BL30784. Estimate CHF2,000 – CHF3,000 ($2,281 - $3,422)
Christie's. GENEVA MAGNIFICENT JEWELS, 14 May 2014, Geneva - http://www.christies.com/