16.23ct Rubellite Tourmaline, Oval Cut Prehnite stone diameter: 1

stone diameter: 1

this vintage rough turquoise ring is a remnant of the typical 1960's American education system

The Weight: 6

Modified Round Brilliant Cut Sphalerite

16.23ct Rubellite Tourmaline, Oval Cut Prehnite stone diameter: 1Deep Red Rubellite Tourmaline Stone Stone Variety Rubellite, natural Stone Group Tourmaline Weight (carats) 16. 23cts Weight (grams) 3. 25g Dimensions (millimeters) 18. 70mm x 16. 93mm x 7. 54mm Dimensions (inches) 0. 75" x 0. 66" x 0. 3" Origin likely Brazil Shape faceted oval cut Material Grade B+ Colors dark purple red Treatments Enhancements none Mohs Hardness 7 to 7. 5 SKU Number #1051 Additional Notes Round circles seen in the photos and video