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Ethiopian Black Opal, Cabochon, 0.59 ct
$130.00
This polished black opal is from the recently discovered deposit at Stayish mine near the town of Gashena. We source rough opals and cut and polish custom-made cabochons for jewelry companies and collectors.
External reference: GIA: New Deposit of Black Opal from Ethiopia, 2014, Opal Body Tone Scale.
| Lot ID | OP-ET-P-77 |
|---|---|
| Gem type | Black opal – non-hydrophane (does not absorb water) |
| State | Polished |
| Pieces | 1 |
| Weight | 0.59 ct |
| Shape(s) | Cabochon |
| Length / width / depth | 6.45 mm / 5.5 mm / 3 mm |
| Body tone | N1 (N1 – N4 are the black body tone types) |
| Brightness | 2 (1 = brightest, 7= dullest) |
| Treatment | No treatment, 100% natural |
| Origin | Wollo, Ethiopia |
| References | GIA: New Deposit of Black Opal from Ethiopia, 2014 |
DEPOSIT CHARACTERISTICS
1. Black opal is found at the contact zone / stratum between volcanic rock and an underlying clay-rich layer;
2. This opal-bearing layer is contained in a single stratum and extends for c. 10-50 km along the mountain belt;
3. The black opal yielded is non-hydrophane and does not absorb water;
4. Extracted material generally comes as nodules and chunks that are 2–5 cm long; and
5. The colour patterns include: harlequin, patchwork, honeycomb etc..
BLACK OPAL DEPOSIT LOCATION
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