Birthstone list
![[Jeweler's Tools] 3-piece set: Jewelry Loupe (14x magnification), Blue Diamond, and Pink Tourmaline or Sapphire](http://store.karatz.jp/cdn/shop/files/collage_bd83e868-fedf-4eb9-ab5d-dd5251559969.png?v=1788516975&width=2000)
![[6/ 10 PM JST Release] 《Limited to 11 Stones》Bicolor Gemstone Gacha featuring Paraiba Tourmaline and Euclase 《Bulk Purchase Discount Available》](http://store.karatz.jp/cdn/shop/files/collage_7b7dc323-95d7-4adf-b87d-7f158eb4b182.png?v=1787295459&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/P8200767.jpg?v=1787563557&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/2026-08-2115.28.22.png?v=1787293728&width=1285)
【8/30 22時販売】《残り2石》コロンビア産エメラルド原石（平均0.25ct）《複数購入割引有》
Sale price¥7,980
【9/7 22時販売】《限定10石》鑑定書付きダイヤモンドが当たるダイヤモンドガチャ（全石VSクラス相当）《複数購入割引有》
Sale price¥3,980
【8/29 22時販売】《限定11石》コロンビア・ムゾー産エメラルド原石（平均0.20ct）《複数購入割引有》
Sale price¥5,980
【9/5 22時販売】《限定4石》ローズカットのターコイズ（訳ありサンジェ氏カット,最大12mm）《複数購入割引有》
Sale price¥2,980
【9/4 22時販売】《限定16石》コロンビア産エメラルド原石（平均0.35ct）《複数購入割引有》
Sale price¥5,980
![[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)
【9/12 22時販売】《限定16石》ブルートパーズ・サンジェ氏新作「ミルキーウェイスターカット」《複数購入割引有》
Sale price¥5,980
![Limited to 10 stones: London Blue Diamond Gacha Loose Stone (including 3.6mm, VS-SI grade equivalent, treated) [Multiple purchase discounts available]](http://store.karatz.jp/cdn/shop/files/collage_1dfb1fff-9549-47b5-bbc8-60266f46a8a7.png?v=1788427815&width=2000)
【9/4 22時販売】《限定7石》コロンビア産ミントカラーエメラルド原石（平均0.51ct）《複数購入割引有》
Sale price¥6,980
![[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)
[Posted on 12564085] Brazilian Spessartine Garnet 1.592ct Loose
Sale price¥39,800
Brazilian parti-color tourmaline 2.702ct loose stone
Sale price¥69,800
【9/18 22時販売】【カラフリ】K10アクアマリン リング鑑別書
Sale price¥39,800
【9/18 22時販売】【カラフリ】Pt900 エメラルド 0.47ct ダイヤモンド0.13ctペンダントトップ（ネックレストップ）鑑別書
Sale price¥39,800
【9/18 22時販売】【カラフリ】Pt900 トルマリンキャッツアイ 4.598ct ダイヤモンド0.20ctリング
Sale price¥98,000
【9/18 22時販売】ブラジル産バイカラーシトリン 4.027ctルース
Sale price¥3,980
【9/18 22時販売】タイ産ブラックスターサファイア 7.437ctルース
Sale price¥19,800
【9/19 22時販売】メキシコ産カンテラオパール 24.256ctルース
Sale price¥69,800
【9/19 22時販売】コロンビア産パイライト付きエメラルド 0.634ct原石
Sale price¥19,800
【9/19 22時販売】コロンビア産パイライト付きエメラルド 0.981ct原石
Sale price¥29,800
【9/19 22時販売】コロンビア産エメラルド 1.645ct原石
Sale price¥49,800
Colombian pyrite-mica emerald 0.628ct loose stone
Sale price¥29,800
YAG (Yttrium Aluminum Garnet) 6.5mm/1.551ct Loose Stone
Sale price¥15,800
American Herkimer Diamond 5.6mm/0.516ct Loose
Sale price¥8,800
Russian demantoid garnet (horsetail recognized) 5.5mm/0.710ct loose
Sale price¥188,000
![[202608GIA Appraisal Request] [Sale on June 5th at 10 PM] Russian Demantoid Garnet (with horsetail inclusion) 5.8mm/0.876ct Loose Stone with Appraisal Report](http://store.karatz.jp/cdn/shop/files/P4221452_2caaa8e8-594d-45b2-87f6-54d9636c03d0.jpg?v=1789271560&width=3537)
Russian Demantoid Garnet (Horsetail) 5.8mm/0.851ct Loose Stone
Sale price¥228,000
Russian Demantoid Garnet (Horsetail Recognized) 5.1mm/0.664ct Loose Stone
Sale price¥228,000
Russian demantoid garnet (horsetail recognized) 5.3mm/0.692ct loose
Sale price¥158,000
![[202608GIA Appraisal Request] Russian Demantoid Garnet (horsetail inclusion confirmed) 5.2mm/0.661ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P2070165_1.jpg?v=1789270658&width=3441)
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.