Why is it called onyx if it is chalcedony?

Onyx in the gem trade usually means solid-coloured chalcedony, while strict mineral usage reserves it for banded stones. The card names it Natural Green Onyx and lists the species as chalcedony, so both terms describe this stone.

How do I convert 8.40 carats into grams and ratti myself?

Multiply carats by 0.2 for grams: 8.40 × 0.2 = 1.68 g. Divide carats by 0.91 for approximate ratti: 8.40 ÷ 0.91 = 9.23. Ratti values vary by region, so treat this as an estimate.

How would you describe the colour of this stone?

The card lists the colour simply as green. In the photo it looks medium to deep green with a softly translucent body, though screens vary, so real colour may differ slightly in daylight.

What information does the card give, and what is missing?

The card gives colour, weight, shape, refractive index, optic character, magnification notes, UV effect, specific gravity and species. It does not give a laboratory name, certificate number, dimensions or treatment details.

Does treatment affect how I should wear it?

Treatment is not specified, so we cannot confirm whether the colour is natural or enhanced. As a precaution, avoid prolonged heat, strong sunlight and harsh cleaners, which can affect enhanced chalcedony more than untreated stones.

Natural Green Onyx - 8.40 carat

Tall oval natural green onyx, 8.40 carat, with broad facets to suit pendants, rings and drop designs

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₹ 2,520

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Description

Set this stone upright and its tall oval outline becomes the centrepiece of a pendant or a ring. The natural green onyx, identified as chalcedony, is listed at 8.40 carats and cut in an oval mixed style with broad, angled facets. Its green body is softly translucent, and fine dark dendritic inclusions noted on the card show across the surface. A bezel protects the edges, while open prongs show m...

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