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Chalcedony

Chrysoprase

Apple-green to emerald-green, colored by nickel

Apple Green Green
Optical properties

Optical characteristics

Ref. index
1.53 – 1.543
Birefringence
0.004
Luster
Waxy
Pleochroism
None None.
Fluorescence
Weak greenish under LW UV.
Origins

Source localities

Australia Australia: Queensland opal fields
Significant ★ Top Source

Important boulder opal source; Queensland is also the world's premier chrysoprase producer.

45% est. supply
Brazil Brazil: Minas Gerais / Paraíba / Bahia
Significant

Major source for beryl, tourmaline, quartz, topaz, chrysoberyl and rare minerals.

20% est. supply
Tanzania Tanzania: Umba Valley
Significant

Diverse alluvial deposit known for color-change sapphires, Umba padparadscha, rhodolite and malaia garnet.

15% est. supply
India India: Rajasthan / Odisha / Karnataka
Commercial

Historic and modern source for garnet, moonstone, corundum and other gems.

20% est. supply
Treatments

Enhancement & treatment

Color Enhancement Dyeing Dyeing artificially improves color in porous or fractured materials. Durability varies and disclosure is…
Inclusions

Inclusions & features

Clouds Pinpoint Clouds Under 10x loupe: concentrations of extremely tiny bright dots that individually are too small… Zoning Color Zoning Under 10x loupe in immersion: bands or patches of deeper or lighter color arranged…
Identification

Instruments used

10x Loupe Your most-used instrument, start every examination here Refractometer Measures refractive index, the backbone of gem identification Hydrostatic Scale Measures specific gravity, works even on opaque stones UV Lamp, Long Wave and Short Wave Fluorescence exposes treatments, synthetics, and origin