GIA's Gübelin Gem Project: Spinel

Found in nearly every color – most notably red, pink and blue – spinels are popular gemstones because of their abundance, moderate cost and attractiveness. Red spinel has often been mistaken for ruby. Some spinel exhibits asterism (a star-shaped pattern of reflections), chatoyancy (a “cat’s-eye” effect seen in reflected light) or a color change when viewed alternately under incandescent and fluorescent lighting.

 

34613 3.34 ct Spinel Myanmar (PDF)	33510 4.27 ct Spinel Myanmar (PDF)	33502 4.54 ct Spinel Myanmar (PDF)
34605 5.70 ct Spinel Myanmar (PDF)	33508 5.72 ct Spinel Myanmar (PDF)	33512 9.33 ct Spinel Myanmar (PDF)
34664 9.98 ct Spinel Myanmar (PDF)	34592 10.42 ct Spinel Myanmar (PDF)	34618 10.94 ct Spinel Myanmar (PDF)
34610 11.21 ct Spinel Myanmar (PDF)	34661 20.98 ct Spinel Myanmar (PDF)	33506 3.43 ct Spinel Pakistan (PDF)
33532 4.11 ct Spinel Pakistan (PDF)	34904 0.68 ct Spinel Sri Lanka (PDF)	34903 1.38 ct Spinel Sri Lanka (PDF)
34923 2.50 ct Spinel Sri Lanka (PDF)	33545 3.73 ct Spinel Sri Lanka (PDF)	33521 4.67 ct Spinel Sri Lanka (PDF)
33491 5.32 ct Spinel Sri Lanka (PDF)	33541 5.42 ct Spinel Sri Lanka (PDF)	33492 6.65 ct Spinel Sri Lanka (PDF)
34922 7.98 ct Spinel Sri Lanka (PDF)	34925 8.10 ct Spinel Sri Lanka (PDF)	34907 8.29 ct Spinel Sri Lanka (PDF)
34915 9.39 ct Spinel Sri Lanka (PDF)	33534 11.44 ct Spinel Sri Lanka (PDF)	34914 13.52 ct Spinel Sri Lanka (PDF)
33526 13.71 ct Spinel Sri Lanka (PDF)	33535 19.31 ct Spinel Sri Lanka (PDF)	33496 9.79 ct Spinel Tajikistan (PDF)