Sweet blue and yellow duo of YAG.  Bonus the blue is a color change!  It turns purple.
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Yttrium aluminum garnet (YAG, Y3Al5O12) Lab created garnet with a RI of 1.833 and 8.5 hardness, making it suitable for everyday jewelry. YAG is also known for its fabulous dispersion.⁠

2 pieces / 25.97 total grams / 129.85 total carats / 64.92 average carats / clean