The collection
20.50 ct royal blue tanzanite, heart shape fine step cut, on grey cloth
Photograph

20.50 ct, 18.12 × 17.17 × 11.82 mm, heart fine step cut.

CWG1041 Tanzanite (blue zoisite)

20.50 ct Royal Blue Tanzanite, Heart Fine Step

A flashy royal blue tanzanite heart from Arusha, Tanzania, 20.50 carats, loupe clean, in a fine step cut.

$7,175$350 per carat 20.50 ct

Free express shipping worldwide Certification and shipping

Optional. An independent laboratory examines the stone before it ships. Sold on our full written disclosure either way.
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  • Natural
  • Heated
  • Loupe clean (IF)
  • Tanzania
SKU
CWG1041
Variety
Tanzanite (blue zoisite)
Colour
Royal blue
Weight
20.50 ct
Dimensions
18.12 × 17.17 × 11.82 mm
Shape
Heart
Cut
Fine step cut
Clarity
Loupe clean (IF)
Origin
Tanzania
Treatment
Heated
ClarityIF
  1. IF
  2. VVS
  3. VS
  4. SI-1
  5. SI-2
  6. I
  7. TS
  8. O

This 20.50 ct tanzanite (blue zoisite) is graded IF. Internally flawless: loupe clean: no inclusions can be seen even under a 10x loupe.

The cut

Fine step cut

Top view
18.12 mm11.82
Side profile

A step cut with more, narrower rows of facets. The extra steps give the long, clean flashes of a step cut with a livelier, more layered glow, and they hold colour evenly across the stone.

  • More rows of narrower steps
  • Richer, layered flashes
  • Even colour from edge to edge
Enquire about CWG1041Opens WhatsApp to +66997975799 with this stone attached. Or email [email protected].

One of the finest we have handled: a deep royal blue with violet flashes and exceptional clarity. The heart is 18.12 mm across and 17.17 mm tall, and its fine step facets set up long, flashy bands of colour across the face.

Loupe clean. Tanzanite is heated as a matter of course to reach this blue. A statement drop for a pendant or a ring.

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Before it ships

Certification & shipping

Certification

Optional laboratory report

This 20.50 ct tanzanite (blue zoisite) is sold on our own written description, with full disclosure of treatment. If you would like an independent report, choose a laboratory in the certificate menu beside the price and we send the stone before it ships. It is optional, and the 14 day return stands either way.

  • GübelinGübelin Gem Labfrom $400
  • GRSGemResearch Swisslabfrom $120
  • GIAGemological Institute of Americafrom $90
  • BellerophonBellerophon Gemlabfrom $70
  • GuildGuild Gem Laboratoriesfrom $60
  • AIGAmerican International GemLab$15
  • GFCOGFCO Gemological Laboratory$15

AIG and GFCO are a fixed fee. Other laboratories start at the figure shown and depend on the report type. Reports describe the stone independently of us.

Shipping and returns

Free express shipping, worldwide

Shipping toCarrierTypical transitCost
ThailandExpress courier1–2 daysFree
United StatesFedEx or DHL Express2–4 daysFree
Europe and UKFedEx or DHL Express2–5 daysFree
Rest of the worldFedEx or DHL Express3–7 daysFree
  • In the boxThe stone in a gem box, an itemised invoice, and the lab report if you add one.
  • Returns14 days from delivery for a full refund, in its original condition. Return postage is paid by the buyer.
  • Voids a returnThe stone has been set, recut, altered or damaged.

Dispatched within 24 to 48 hours of payment, or once the lab report is back. Full detail in our shipping and returns policy.

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