Chrysoprase is a green variety of chalcedony, a fibrous quartz aggregate. Coloured by tiny inclusions of pimelite, this is a rare example of a green gem whose colour arises from nickel. Chromium, which imparts a green hue in emerald, can also create green chalcedony. However, this chrome chalcedony constitutes a distinct gem variety from chrysoprase.
Gemologists describe colour using hue, tone, and saturation. For chrysoprase, the primary hue is green, and top-colour gems are a bright, apple green. Secondary hues of yellow or blue may be present. However, secondary yellow hues are undesirable. Top-quality specimens won’t show these.
Facts:
- Mohs hardness: 6.5
- Mineral: Fibrous Quartz Aggregate
Chrysoprase is a green variety of chalcedony, a fibrous quartz aggregate. Coloured by tiny inclusions of pimelite, this is a rare example of a green gem whose colour arises from nickel....
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About Chrysoprase
Chrysoprase is a green variety of chalcedony, a fibrous quartz aggregate. Coloured by tiny inclusions of pimelite, this is a rare example of a green gem whose colour arises from nickel. Chromium, which imparts a green hue in emerald, can also create green chalcedony. However, this chrome chalcedony constitutes a distinct gem variety from chrysoprase.
Gemologists describe colour using hue, tone, and saturation. For chrysoprase, the primary hue is green, and top-colour gems are a bright, apple green. Secondary hues of yellow or blue may be present. However, secondary yellow hues are undesirable. Top-quality specimens won’t show these.
Facts:
- Mohs hardness: 6.5
- Mineral: Fibrous Quartz Aggregate
Chrysoprase, green, trillion, cabochon, 14x12 mm
Chrysoprase, green, round, faceted, 8 mm
