![[Available until Fri, 11/13] <only left> Anime "Assassination Classroom" x KARATZ Collaboration: Koro-sensei Five Great Gems Figure <limited to units></limited></only>](http://store.karatz.jp/cdn/shop/files/ansatsu_bnrC_1_1080x1080_1be8ed3d-7a10-47a1-9508-85a22ed9b825.jpg?v=1760620266&width=1080)
Additional charge: K18YG (base metal) + 20,000 yen
Sale price¥20,000
Additional charge: K18WG (base metal) + 20,000 yen
Sale price¥20,000
[Option] GIA certificate issuance fee
Sale price¥15,000
shipping adjustment
Sale price¥480
[Option] Laser engraving of characters and symbols
Sale price¥4,000
Lilium "Semi-custom pendant frame"
Sale price¥59,800
Elegante "Semi-custom ring setting"
Sale price¥89,800
Additional fee: +40,000 yen
Sale price¥40,000
![[Available 10/30 at 10:00 PM] 《Limited to 8 stones》 Kochi Prefecture Red Coral Round Beads (8.5–9.0 mm) 《Multi-buy discount available》](http://store.karatz.jp/cdn/shop/files/PA061362_522f9b23-dc30-4ff8-a6a7-2bd5dfde90de.jpg?v=1791679769&width=4000)
![[9/22 8:00 PM Sale] Fluorite Gacha: Win a Koshu Kiseki Kiriko (Limited to 16 stones) [Multi-purchase discount available]](http://store.karatz.jp/cdn/shop/files/120_1.png?v=1791601105&width=1890)
![[Available 11/1 at 10 PM] 《Limited 9 pieces》 Indian Iolite Sunstone loose stone (avg. 0.70ct, pear-shaped cut) 《Multi-buy discount available》](http://store.karatz.jp/cdn/shop/files/collage_f453805f-efe0-4cb6-9064-b8b6860ac31c.png?v=1791682551&width=2000)
![[9/22 10:00 PM Release] <limited to stones> 1 Imperial Topaz stone (includes Brazilian unheated sherry color) (comes with 1 London Blue Topaz stone) - Regular price 22,800 yen <multiple purchase discount available></multiple></limited>](http://store.karatz.jp/cdn/shop/files/116.png?v=1789857914&width=1512)
![[On sale August 16th at 10 PM JST] Limited to 4 stones: Swiss Blue Topaz (Star of David/Hexagram Cut, approx. 8mm) [Multiple purchase discount available]](http://store.karatz.jp/cdn/shop/files/collage_538f8612-0b8f-4695-9de5-c35b848960aa.png?v=1788921228&width=2000)
![[Available 9/4 at 10 PM] 《16 Stones Limited》 Colombian Emerald Raw Stones (Average 0.35ct) 《Multiple Purchase Discount Available》](http://store.karatz.jp/cdn/shop/files/collage_c08fd04c-cb40-4b64-8210-7094d07ed197.png?v=1788334930&width=2000)
![[8/29 10 PM Sale] <<11 Stones Only>> Raw Emerald from Muzo, Colombia (Avg. 0.20ct) <<multi-purchase discount available>></multi-purchase>](http://store.karatz.jp/cdn/shop/files/collage_8a983e9d-ab06-40f8-8ca8-32257c5ebc00.png?v=1787903111&width=2000)
![[On sale May 29th at 10 PM] "Checker x Sui" Koshu Kiseki Cut Mexican Fire Opal (usually 79,800 yen) Gacha with only 10 stones available. Win a Fire Opal (and receive one Contraluz!). [Multiple purchase discount available]](http://store.karatz.jp/cdn/shop/files/P8200827.jpg?v=1787563629&width=4000)
![[On sale August 21st, 10 PM] "Limited to 20 stones" Sri Lankan Ratnapura Green Zircon Single Stone Loose Gemstone "Bulk purchase discount available"](http://store.karatz.jp/cdn/shop/files/P8070258.jpg?v=1787095598&width=4000)
![[On sale August 12th at 10 PM] "Limited to 15 Stones" Diamond Gacha featuring rare butterfly-cut diamonds "Multiple Purchase Discount Available"](http://store.karatz.jp/cdn/shop/files/2026-08-0717.06.55.png?v=1786090036&width=1279)
![[On sale May 10th, 10 PM JST] 6 Limited Pieces - Brazilian Mica in Rose Quartz (One stone), Multiple Purchase Discount Available](http://store.karatz.jp/cdn/shop/files/P5070688.jpg?v=1778245850&width=4000)
[Option] Milling
Sale price¥30,000
![[Sales end 11/13 (Fri)] Anime "Assassination Classroom" x KARATZ Collaboration: Koro-sensei Model Pendant Top](http://store.karatz.jp/cdn/shop/files/ansatsu_bnrC_3_1080x1080_fc821a2d-a1bd-4f69-bb76-e633fd9eb219.jpg?v=1760620244&width=1080)
Madeleine "Semi-custom ring setting"
Sale price¥89,800
Additional charge for resizing: 1,500 yen
Sale price¥2,500
Why not take your favorite gemstone that you found at KARATZ and have it made into custom-made jewelry? It will be made by skilled Japanese craftsmen.
We carefully craft each piece of jewelry, starting with the stone setting, to match the individual characteristics of the gemstone.
So that more people can feel closer to jewellery and enjoy it easily.
We will introduce KARATZ's thoughts on products, the attention to detail and efforts in selecting gemstones and creating jewelry.
KARATZ's Initiatives and Social Contributions
We will introduce KARATZ's efforts, including nurturing the next generation and business collaboration to develop the industry, and supporting children in Sri Lanka, the land of jewels.
KARATZ Books
These are books that KARATZ has been involved in writing, supervising, and planning. They are all books that allow you to enjoy gemstones from various angles. You can also purchase them directly.
jeweler's tools
For those who want to enjoy jewelry more but don't know what tools to use, we will introduce tools that are also used by KARATZ staff. You can also purchase them directly.