Turquoise
In turquoise stones, the mineral is a hydrous copper aluminum phosphate; the rich blue colors are ascribed to copper, while the presence of iron introduces a greenish cast. The U.S. today is a major source of turquoise. Most of the mines are in Arizona and New Mexico. Persian turquoise is known to be among the finest stones because it is dense, non-porous and can take a high polish.
| GENUINE TURQUOISE | GENUINE TURQUOISE | IMITATION TURQUOISE | IMITATION TURQUOISE | IMITATION TURQUOISE | IMITATION TURQUOISE |
| OVAL CABACHON | ROUND CABACHON | OVAL CABACHON | ROUND CABACHON | PEAR CABACHON | MARQUISE CABACHON |
| 5X3 mm $1.50 | 2.00mm $1.00 | 5x3 mm $.80 | 2.00 mm $.50 | 5x3 mm $1.20 | 4x2 mm $1.00 |
| 6x4 mm 2.25 | 3.00mm 1.20 | 6x4 mm 1.00 | 3.00 mm .60 | 6x4 mm 1.30 | 6x3 mm 1.25 |
| 7x5 mm 4.20 | 4.00mm 1.50 | 7x5 mm 1.10 | 4.00 mm .65 | 7x5 mm 1.40 | 10x5 mm 1.50 |
| 8x6 mm 6.50 | 5.00mm 2.00 | 8x6 mm 1.20 | 5.00 mm .80 | 8x5 mm 1.50 | 12x6 mm 2.25 |
| 9x7 mm 8.75 | 6.00mm 3.50 | 9x7 mm 1.40 | 6.00 mm .85 | 9x6 mm 1.60 | 15x7 mm 3.25 |
| 10x8 mm 14.00 | 7.00mm 6.50 | 10x8 mm 1.60 | 7.00 mm 1.00 | 10x7 mm 1.70 | |
| 11x9 mm 20.00 | 8.00mm 9.50 | 11x9 mm 1.80 | 8.00 mm 1.40 | 13x8 mm 2.00 | |
| 12x10 mm 36.00 | 9.00mm 15.00 | 12x10 mm 2.00 | 9.00 mm 1.60 | 15x10 mm 3.00 | |
| 14x10 mm 52.00 | 10.00mm 24.00 | 14x10 mm 2.60 | 10.00 mm 1.80 | ||
| 16x12mm 90.00 | 11.00mm 40.00 | 14x12 mm 3.00 | 11.00 mm 2.00 | ||
| 18x13mm 125.00 | 12.00mm 55.00 | 16x12 mm 3.80 | 12.00 mm 2.20 | ||
| 20x15mm 175.00 | 13.00mm 60.00 | 18x13 mm 4.20 | 15.00 mm 3.00 | ||
| 14.00mm 80.00 | 20x15 mm 5.20 | 18.00 mm 3.80 | |||
| 25x18 mm 5.60 | 20.00 mm 4.50 | ||||
| 30x22 mm 6.60 | 25.00 mm 5.00 | ||||
| 40x30 mm 7.50 | 30.00 mm 6.00 | ||||
| 38.00 mm 7.00 | |||||