Skip to main content
#1 for fine Gems & Jewelry in Europe
My Account
our twitterour facebook page pintrest instagram

Unheated Concave-Cut Tourmaline 1.87 (COT187)

dark blue green Mozambique tourmaline concave cut
more images
back add to cart buy now

1.87 Carat
Dark Blue-Green
Medium Dark 70-90
Free of Inclusions



  • Identification: Natural Unheated & Untreated Tourmaline
  • Carat: 1.87
  • Shape: Oval Concave
  • Measures: 9.92x6.84x4.61 (millimeter)
  • Color Grade: Very Good
  • Tone: MD70 to MD90
  • Color Zoning: None
  • Clarity: Free of Inclusions
  • Cutting Grade: Excellent (precision concave cut)
    • Brilliancy: 50%
    • Depth: 67%
  • Origin: Mozambique
  • Treatment: None

Certificate No: IGI 208615067

Overall Grade: Excellent

Comment: Concave-cut dark blue-green tourmaline with opposing optical features: The gem is brightest in the center, where it is thickest and normally should be darkest, but here it results in an outward sparkling center, getting darker towards the thinner tips. The reason for this ususual sight can be found in the rough crystal shade but also in the concave facets, which are not flat but curved inwards. In this gem the cutter used concaves not only on the backside but also on the front (a first time to me). As clearly visible in the images this has all kinds of unusual effects from various angles an in changing light. The overall impression of the gem is dark blue-green, from MD70 in the center to MD90 in the outer rims. No inclusions are found even under the lens. Full IGI report, unheated and defined as verdelite but clearly bordering to indicolite. So far off the beaten track it deserves a medal for uniqueness. See side images! From the same cutter and origin as CTO129 but in many ways exactly the opposite. If you are looking for a special green gem in a gent's ring, look no further.

Note to self or cart
add to cart buy now add to wishlist

20 Years Online!

From Our Workshop: (mouse-over->halt) 

2022' Updated & Expanded

- Cuts/Shapes -
- CC Sapphire -
- Emerald -
- Gems In Jewelry -
- Diamond -
- Peridot -
- Rubelite -
- Sunstone -
- Opal -
- Tanzanite -

and more...

Free shipping with global parcel service:
Fedex, UPS, DHL, ExpressPost etc.

Join the Club: Get the insider deal! 

save up to 30%
Join here!

New codes!
Ed's personal site

original & independent scanned

Each gem with
our extensive
(samples1, 2, 3)

Bespoke Jewelry Only
Only for you, and yours.

(Image: Kashmir Blue unheated sapphires in platinum with
totally-NOT-every-day extra-secure one-only clutch)

3*NOS® of Excellence:
NO Treatments.
NO Inclusions.
NO Windows.

Natural Gemstone Jewelry

The Finest From London:
The David Jerome Collection 

(YouTube-vid in pop-up)


US and CAN Call Toll-Free:


International Please Call:



Wherever you are:

Site Mailing List 
Natural Gems Only - No Heat. No Radiation. No Bleaching. No Coating. No Filler. No Diffusion. No Chemicals.


Genuine testimonials from over 20 years

Call us TOLL-FREE from the US and Canada:
International customers please call:

In case of technical problems,
drop us a note or let us call back.

If we are out of the office, please leave a voice message and we will contact you.

Our 3*NOS® of Quality:
NO Treatments.
NO Inclusions.
NO Windows.

 © Wild Fish Gems 2001 - 2023

As everybody these days, we now need to ask for your Cookie-OK.
Are you OK?
We hope this message shows only once.