12 · December · Tanzanite / Turquoise / ZirconRepresentative photograph. Natural stones vary in colour and inclusions from piece to piece — yours will not be identical to this one.
Tanzanite Pendant 6×4 mm
Heated tanzanite — blue zoisite, from one deposit on earth.
Coloured stones are natural material. Colour, tone, inclusion pattern and — on cabochons and uncut pieces — outline and size differ from one to the next. Two pieces of the same reference will not be identical.
Gem declaration
Stated in full before you buy — what these terms mean
- Species
- Tanzanite (zoisite)
- Origin
- NaturalFormed in the earth. Cut and polished by people; the material itself is not made by people.
- Treatments
- HeatedControlled heating, applied to develop or even out colour. Stable and permanent under normal wear. This is the most common treatment in the coloured stone trade.
- Carat
- 0.55 ct
- Size
- 6.0 × 4.0 mm oval
- Mohs hardness
- 6 – 7
- Wear grade
- Occasional wear — avoid knocks
- Note
- One direction of perfect cleavage. Avoid ultrasonic cleaning and sudden temperature change.
Wearing it
Occasional wear — avoid knocks
- Remove before gym equipment, gardening, DIY and washing up
- Do not stack against harder stones, which will abrade this one
- Avoid sudden temperature change
Metal
- Metal
- 925 sterling silver
- Fineness
- 925
- Net metal weight
- 2.30 g
- Hallmark
- Below the statutory exemption weight — not hallmarkedAt 2.30 g this article is under the 7.78 g exemption for 925 sterling silver in the Hallmarking Act 1973, so a UK hallmark is not required. The metal is still solid 925 fineness; the exemption concerns marking, not the alloy. Read the exemption weights.
- Plating
- None — solid metal throughout, not plated, filled or coated
Cleaning limits for this piece
- Warm water, a drop of plain washing-up liquid and a soft brush. Rinse and dry fully before storing.
Full method on the care guide.
Sizes
Chain lengths available: 40 cm (16 in), 45 cm (18 in), 50 cm (20 in). Measured end to end including the clasp.
Add to your basket
- Price and VAT
- £245 including VAT at the applicable UK rate. Delivery is charged separately and shown in full before payment.
- Delivery
- Tracked UK delivery from £4.95, free over £120. Dispatched within two working days. Delivery and shipping restrictions.
- Changing your mind
- 14 days from delivery to change your mind, no reason needed. Returns, refunds and the withdrawal form.
About this piece
Tanzanite is blue zoisite and it comes from a single small area in the Merelani Hills of northern Tanzania. Nowhere else. Almost all of it is heated: the crystals come out of the ground brownish and heating to around 500°C turns them blue. This one is heated and declared. It is strongly trichroic, showing blue, violet and a brownish tone down different crystal axes, which is why the cutter's orientation matters so much on this species. Mohs 6 to 7 with one direction of perfect cleavage — occasional wear only.
