Table 1 The Sr/Ca ratio of TNC pearl samples I1, I2 and reference samples G1, T1, A1, E1.

From: Unraveling the luminescence secrets of turquoise nucleus cultivated pearls

Samples

Integral area of Sr/Ca

E1

0.174

T1

0.549

A1

0.411

G1

0.547

I1

0.371

I2

0.556