Corundum [synthetics] — specimen S-004, photo © NMNHS
Corundum [synthetics] — specimen S-004
Weight: 6.29 ct; size: 14.87 | 7.90 | 4.94 mm; shape: cushion; colour: medium light purple; very slightly greyish; clarity: eye clean; cut: good.
Very clean specimen; commercial cut; good polish.
More information from ‘Classification’
Manufactured mainly using the Verneuil process, also called flame fusion, developed by the French chemist Auguste Verneuil.