Here is a fantastic crystal with perfect shape, good clarity, and just about every color tanzanite has to offer, including the elusive reds. This one also puts on quite a show under polarized light.
It measures 19 x 18 x 8 mm and weighs 4 grams.
https://youtube.com/shorts/L_cch7_DDCg?si=V75hgnxqBPmaM3cH