AFRICAN AMETHYST
Product: Natural Amethyst, Shape: Pear caboson, Color: Violet, Size: 23.60x18.70 mm, Weight: 23.80 carats, Clarity: Visible inclusions and fractures, Treatment: Untreated, Origin: Zambia
Reference: SMR9
Product Name: Natural Emerald, Shape: Round, Colour: Green, Stone Size: 4.20 mm, Weight: 0.35 Carat, Stone Clarity: Visible Inclusions and Fractures, Treatment: Untreated, Remarks: Craft Cut, Origin: Zambia
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Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium or sometimes vanadium. Beryl has a hardness of 7.5–8 on the Mohs scale. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor. Emerald is a cyclosilicate.
The word "emerald" is derived (via Old French: esmeraude and Middle English: emeraude), from Vulgar Latin: esmaralda/esmaraldus, a variant of Latin smaragdus, which was via Ancient Greek: σμάραγδος (smáragdos; "green gem") from a Semitic language. According to Webster's Dictionary the term emerald was first used in the 14th century.
This member of the beryl family ranks among the traditional "big four" gems along with diamonds, rubies and sapphires.
Most emeralds are oiled as part of the post-lapidary process, in order to fill in surface-reaching cracks so that clarity and stability are improved. Cedar oil, having a similar refractive index, is often used in this widely adopted practice. The use of oil is traditional and largely accepted by the gem trade, although oil-treated emeralds are worth much less than untreated emeralds of similar quality.
Data sheet
Stone type: Natural Onyx, Shape: Round cabochon, Colour: Black, Weight carat: 0.75 - 1.00, Treatment: Improvement treatment, Source: India, Stone Clarity: Eye clean, Stone Clarity: Opaque appearance, Stone size mm: 5.90 - 6.10, Sale information: Price by piece
Stone type: Natural Amethyst, Shape: Round, Color: Mauve, Stone size mm: 5.90 - 6.10, Weight carat: 0.65, Stone Clarity: Eye clean, Treatment: Untreated, Source: Brazil