Hydrothermal Synthesis and Growth of Coordinated Complex Crystals (Part I) - Hydrothermal Technology - page 403

Table 7.15 Properties of Hydrothermally Grown Emeralds [143]

Refractive Index Birefringence Specific Gravity Chelsea Filter 253.7 nm UV 365 nm

Natural (Santa Terezinha) 1.580 1.588 0.008 2.70 Inert to pink None None

Lechleitner emerald-
coated natural beryl

1.586 1.597 1.580 1.587 0.006 0.010 n.d. Red Pale red to

bright

Pale red to red

Fully synthetic beryl-
emerald composite

1.567 1.573 1.562 1.567 0.005 0.006 2.67 2.69 Bright red Bright red Bright red

Linde (0.3 1.2% Cr) 1.567 1.573 1.562 1.567 0.005 0.006 2.67 2.69 Bright red Bright red Bright red

Regency 1.568 1.573 0.005 2.68 Bright red Red Bright red

Biron 1.577 1.570 0.007 2.72 Red to pink Inert Very weak

dark green

1.573 1.569 0.004 0.005 2.68 2.71 Strong pink red Inert Inter

Pool 1.574 1.569 0.005 2.75 Red Inert Inter

1.583 1.586 1.577 1.579 0.006 0.007 2.70 2.71 Soviet None to dark

orange yellow

None None to partly

dark red

1.579 1.587 1.574 1.581 0.005 0.006 2.64 2.66 No reaction Inert Dull red