Opal Value Adjustmets
| Characteristics & Description | All Opal | Black & Black Crystal | Black & Black Crystal |
| Exept Black | Blue-Green | Red-Orange | |
| Range of Fire Color | Range of Fire Color | ||
| Fire Color | |||
| Blue Only | -0.50 | -0.40 | |
| Green Only | -0.10 | -0.20 | |
| Blue-Green | -0.00 | -0.05 | |
| Green-Blue | -0.00 | -0.00 | |
| Green-Orange | +0.05 | +0.10 | |
| Orange-Green | +0.10 | -0.20 | |
| Red Only | -0.00 | -0.20 | |
| Orange-Red | +0.10 | -0.10 | |
| Multicolor | +0.10 | -0.00 | |
| Red Multicolor | +0.20 | +0.10 | |
| Red-Blue Multicolor | +0.25 | +0.20 | |
| Saturisation of Fire | |||
| Dull | -0.10 | ||
| Average | -0.00 | ||
| Vivid | +0.20 | ||
| Pattern | |||
| Pinfire & Small Flashfire | -0.10 | ||
| Flashfire | -0.00 | ||
| Broad Flashfire | -0.00 | ||
| Rolling Flashfire | +0.10 | ||
| Harlequin | +0.20 | ||
| Rare Pattern & Picture Stones | +0.00 to +.0.20 | ||
| Dome | |||
| Low dome | -0.10 | ||
| Medium dome | -0.00 | ||
| High dome | +0.05 | ||
| Cut | |||
| Poor cut or finish | -0.10 to -0.50 | ||
| Excessively fat cut | -0.10 to -0.50 | ||
| Shape | |||
| Standard Oval | +0.10 | ||
| Freesize Oval & Other Standard Shapes | -0.00 | ||
| Freeform Shapes | -0.20 | ||
| Inclusions | |||
| Badly Included | -0.20 to -0.50 | ||
| Slightly Included | -0.10 | ||
| Not Included | -0.00 | ||
| Consistency of Base Color, Brightness and Pattern | |||
| Major Dull Spot | -0.20 | ||
| Minor Dull Spot | -0.10 | ||
| Undesirable Pattern Mix | -0.10 to -0.20 | ||
| Distracting Variations in Base Color | -0.10 to -0.20 | ||
| Consistent | -0.00 | ||
| Directionality of Fire | |||
| Highly Directional | -0.30 | ||
| Very Directional | -0.20 | ||
| Somewhat Directional | -0.05 | ||
| Slightly Directional | -0.00 | ||
| Weight | |||
| Less than 1 Carat | -0.20 | ||
| 1 Carat to 20 Carats | -0.00 | ||
| 20 Carats to 40 Carats | -0.20 | ||
| 40 Carats plus | -0.30 | ||
| High Price Adjustment | |||
| $1.00 to $1000 | 1.00 x Estimated Price | ||
| $1000 to $3000 | 0.95 x Estimated Price | ||
| $3000 to $5000 | 0.87 x Estimated Price | ||
| $5000 to $7500 | 0.80 x Estimated Price | ||
| $7500 to $10000 | 0.75 x Estimated Price | ||
| $10000 or more | 0.70 x Estimated Price |
