I collect Taaffeite - all my eight Taaffeites ( Sri Lanka and Burma) have with a lower RI then 1,722.
- Sri Lanka 0,74 ct dark greyish purple ( 1,718 - 1,722) - Sri Lanka 0,53 ct medium grey bluish purple ( 1,711 - 1,715) - Burma (0,05 - 0,41 ct ) all around 1,717-1,720 they show a medium pink fluor using LW UV - the stones a faint pink ( maybe a small chrome content?)
With a higher Zinc* or Chrome content you will have a higher RI but not 1,777.
* Spinel--> Gahnospinel --> Gahnit = increasing RI too
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