Hyacinth — specimen 0051, photo © NMNHS
Weight: 0.42 ct; size: 4.52 | 4.50 | 2.65 mm; shape: round; colour: medium light yellow; very slightly brownish; clarity: eye clean; cut: very good; treatment: heating.
Very clean specimen; very good brilliant style cut. Source: David Weinberg, Multicolour Gems Ltd
More information from ‘Classification’
Yellow-red to red-brown variety of zircon.