Add products to the DISCOUNTED PRODUCTS section From Tuesday, October 28 at 2:30 p.m. to Monday, November 3, 2025 at 11:59 p.m., 30% off a selection of around 100 products in the “discounted products” section 🤩

PROMO CODE -10% : "PATIENCE" We will be away from home from June 19th to July 3rd included. Meet us at the swimming-pool, booth ZM-PI-15 :) ⚠️ Any orders placed on the site during this period will be processed when we will be back. 🙏 We are therefore offering you a 10% discount on ALL THE WEBSITE (including promotional products), with the code 👉 PATIENCE 👈 to be entered when finalising your order :)

PROMO FLASH : -15% OFF ON THE WHOLE SITE 24-hour FLASH SALE: 15% off EVERYTHING ON THE SITE, no code needed, the discount is automatic! 👉 Promotion valid from January 3, 2026, at 8:00 p.m. (French time) to Monday, January 5, 2026, at 10:00 p.m. (French time). ⚠️ It is not possible to earn loyalty points during this promotion period.

LAST DAYS TO ORDER Join us at the Sainte-Marie-aux-Mines mineral & gem show, booth ZM-PI-15 from June 25 to 29! Orders placed up to and including June 18 can be shipped before we leave 👍

FLASH PROMO off the entire site*

* Excluding new products and already discounted products

Valid from Tuesday 07/10/2025 - 08 am (French time) to Sunday 12/10/2025 - 11h59 pm (French time), for immediate orders (no reservations).
Cannot be combined with the loyalty program.

Hurry, only :

Day

Hours

Minutes

left until the end of the promotion :)

Dioptase after calcite - Tantara Mine, Katanga, Congo

Dioptase after calcite - Tantara Mine, Katanga, DR Congo

€90.00

Tax included

An interesting double-sided specimen featuring a unique and aesthetically pleasing mineral association.

On the front, there is a superb perimorphosis of calcite into dioptase. The imprint of the calcite scalenohedron is perfectly preserved and clearly visible, offering a very graphic crystallization. The dioptase displays a magnificent intense green color and a beautiful luster.

On the reverse side, the specimen reveals a delicate association of small, colorless, brilliant quartz crystals accompanied by soft-hued plancheite spheres, creating a very aesthetic contrast with the dioptase.

3.6 x 3 x 2.5 cm

Highlights of this specimen:

- Specimen exhibiting an interesting paragenesis.
- The color of the dioptase

For your information:

- The term “perimorphosis” refers to a crystallization phenomenon: A mineral that crystallizes on the faces of an existing mineral (here, dioptase in place of calcite) and retains the shape of the latter (visible imprint of the calcite scalenohedron).