






































[Koshu Precious Stone Kiriko] Extra large smoky quartz 108.336ct loose "Collaboration" with emblem
Quartz is called crystal in Japanese. The mineral name is quartz. Quartz is the king of minerals as it has a stable supply and is easy to care for, but it is also a deep stone with many types such as amethyst and citrine. This is a light brown or gray smoky quartz.
Collaboration work between Shimizu Kiseki and Mr. Yoichi Fukasawa This is a loose Colombian fluorite cut by Koshu Kiseki Kiriko . This Koshu precious stone Kiriko cut was created by two masters: Yukio Shimizu, representative of Shimizu Precious Stones, and Yoichi Fukasawa, representative of Jewelry Craft Fukasawa. Mr. Shimizu handles the facets and Mr. Fukasawa handles the facets. Because it is extra large at 108ct, you can enjoy the splendor of the cut glass even with the naked eye.
A special patch is included.
* This is a collaboration product between Shimizu Kiseki and Yoichi Fukasawa x Carats.
・Type: Loose (natural stone)
・Stone name: Smoky quartz
・Weight: 108.336ct
・Scratch/chip: S
・Inclusion: S
・Note: Usually, irradiation treatment is performed.
*Smoky quartz is generally an irradiated gemstone.
・Accessories: Karatz quality guarantee card, case
▷For more information about smoky quartz
What kind of gemstone is smoky quartz? Seeing Morion and Kangorm
*We try to make sure that the colors in the photos are the same as the real thing, but the colors may look slightly different from the real thing depending on the lighting at the time of shooting and the monitor environment you are using. In addition, some photos may be taken using penlights.
*Click here for information on scratches, chips, treatments, and inclusions.
*For other frequently asked questions, please click here .
karatz_item_id: 12529419
Collaboration work between Shimizu Kiseki and Mr. Yoichi Fukasawa This is a loose Colombian fluorite cut by Koshu Kiseki Kiriko . This Koshu precious stone Kiriko cut was created by two masters: Yukio Shimizu, representative of Shimizu Precious Stones, and Yoichi Fukasawa, representative of Jewelry Craft Fukasawa. Mr. Shimizu handles the facets and Mr. Fukasawa handles the facets. Because it is extra large at 108ct, you can enjoy the splendor of the cut glass even with the naked eye.
A special patch is included.
* This is a collaboration product between Shimizu Kiseki and Yoichi Fukasawa x Carats.
・Type: Loose (natural stone)
・Stone name: Smoky quartz
・Weight: 108.336ct
・Scratch/chip: S
・Inclusion: S
・Note: Usually, irradiation treatment is performed.
*Smoky quartz is generally an irradiated gemstone.
・Accessories: Karatz quality guarantee card, case
▷For more information about smoky quartz
What kind of gemstone is smoky quartz? Seeing Morion and Kangorm
*We try to make sure that the colors in the photos are the same as the real thing, but the colors may look slightly different from the real thing depending on the lighting at the time of shooting and the monitor environment you are using. In addition, some photos may be taken using penlights.
*Click here for information on scratches, chips, treatments, and inclusions.
*For other frequently asked questions, please click here .
karatz_item_id: 12529419
Choose options







































[Koshu Precious Stone Kiriko] Extra large smoky quartz 108.336ct loose "Collaboration" with emblem
Sale price¥128,000
Regular price



![[Restock on June 27th at 10 PM] Authentic Gemstone Encyclopedia 3D Stickers Vol. 1: The Big Five Gems](http://store.karatz.jp/cdn/shop/files/IMG_3658.jpg?v=1781061036&width=3384)
![[Sales start 10 PM on 6/26] Limited to 30 sets: 1 in 10 is a pair of 2 stones - Zambian emerald loose stone (approx. 6x4mm, emerald cut) with deep color. (Multiple purchase discount available)](http://store.karatz.jp/cdn/shop/files/collage_aeb10a54-ec73-4ab3-9ab2-40cc227a8bcc.png?v=1782347727&width=3000)


![[On Sale June 27, 10 PM JST] "Limited to 10 Stones" Rough Stone Gacha including Paraiba Tourmaline (CuO: 1.7%+ content) and Benitoite (with a bonus Oregon Sunstone) "Multiple Purchase Discount Available"](http://store.karatz.jp/cdn/shop/files/52_a5256d7b-e60a-4b76-822d-f33111c60340.png?v=1782353139&width=2268)
![[On sale June 27th at 10 PM] Limited to 10 Stones: Sri Lankan Chrysoberyl (Cut by Mr. Sanje) Gacha (Includes Parrot Color, Canary Yellow) [Multiple Purchase Discount Available]](http://store.karatz.jp/cdn/shop/files/P5150155.jpg?v=1779061883&width=4000)
![[On sale May 23rd at 10 PM] "Limited 9 Stones - Shinjuku Pop-Up Celebration" All stones with Central Gem Laboratory sorting (3.0-3.5mm, VS-SI clarity) "Multiple purchase discount available"](http://store.karatz.jp/cdn/shop/files/2026-06-2516.42.36.png?v=1782373473&width=1280)

![[Sale on June 27th at 10 PM] Limited to 2 Stones: Myanmar Red Spinel (Pear Shape approx. 4x3mm) - Multi-Purchase Discount Available](http://store.karatz.jp/cdn/shop/files/P1010276_6883d9c0-c222-4c55-a751-78659b5850e8.jpg?v=1782361559&width=4000)



















![[Jeweler's tools] 4-piece set including loupe (10x magnification), tweezers, and 2 loose stones](http://store.karatz.jp/cdn/shop/files/P4130575.jpg?v=1776126091&width=4000)