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Sold out シーブルーカルセドニー 6.964ctルース

Sea blue chalcedony 6.964ct loose

Sold out 【星桜カット】スカイブルーブルートパーズ 4.919ctルース

[Star cherry cut] Sky blue blue topaz 4.919ct loose

Sold out 「起源がわかる 宝石大全」初版＆宝石小瓶 2点セット

“An Encyclopedia of Gems that Understand the Origin” & Sapphire 2 Stone Set《Purchased in Chanthaburi, Thailand》

Sold out [Jeweler's Tools] 3 black light loose pieces (ruby, red spinel rough, oil-in-quartz) with rechargeable battery

[Jeweler's Tools] 3 black light loose pieces (ruby, red spinel rough, oil-in-quartz) with rechargeable battery

Sold out [On Sale 9/27, 10:00 PM] TV Anime "Dr. STONE" × Jewelry Specialist KARATZ Collaboration: Professional Gemologist's Logo Loupe & Strap Set (includes explanatory card)

[On Sale 9/27, 10:00 PM] TV Anime "Dr. STONE" × Jewelry Specialist KARATZ Collaboration: Professional Gemologist's Logo Loupe & Strap Set (includes explanatory card)

Sold out [Jeweler's Tools] Collection set of 24 loose cases, 3 loose cases [cut by Mr. KEN, worth 8,000 yen]

[Jeweler's Tools] Collection set of 24 loose cases, 3 loose cases [cut by Mr. KEN, worth 8,000 yen]

Sold out 【再入荷】鉱物標本スタンドとサンストーンorアイオライトの2点セット - KARATZ STORE｜カラッツSTORE

[Restocked] 2-piece set of mineral specimen stand and sunstone or iolite

Sold out Diamond 2mm (VS class, DG color, round cut, melee diamond 2.0mm) 1 loose stone {Multiple purchase discounts available}

Diamond 2mm (VS class, DG color, round cut, melee diamond 2.0mm) 1 loose stone {Multiple purchase discounts available}
Sold out 「決定版 アンカットダイヤモンド」サイン入り初版本 ＆ダイヤモンド原石（グリーン蛍光）2点セット

"Definitive Uncut Diamond" by Kyoichi Suwa, signed first edition & 2-piece set of diamonds (hexagonal cut)

Sold out [Sales End on Monday, January 12th] TV Anime "Tokyo Ghoul" x KARATZ Collaboration Part 2: Newly Illustration Merchandise - Random Hard Cards (12 Types)

[Sales End on Monday, January 12th] TV Anime "Tokyo Ghoul" x KARATZ Collaboration Part 2: Newly Illustration Merchandise - Random Hard Cards (12 Types)

Sold out Top Quality: Brazilian Alexandrite 1 Stone Loose (2.0mm, Hematita Mine) Multiple Purchase Discounts Available

Top Quality: Brazilian Alexandrite 1 Stone Loose (2.0mm, Hematita Mine) Multiple Purchase Discounts Available
Sold out 【9/27 22:00 Release】 TV Anime "Dr. STONE" × Jewelry Specialty Store KARATZ Collaboration: Chibi Character Acrylic Keychain

【9/27 22:00 Release】 TV Anime "Dr. STONE" × Jewelry Specialty Store KARATZ Collaboration: Chibi Character Acrylic Keychain

Sold out Cobalt Garnite 1 stone (discount available for multiple purchases)

Cobalt Garnite 1 stone (discount available for multiple purchases)

Sold out 【猫カット】アメジスト（8mm） - カラッツSTORE

[Cat cut] Amethyst (8mm)

Sold out 含浸ルビー・天然ルビー見分け2点セット - KARATZ STORE｜カラッツSTORE

[Jeweler's Tools] 2-piece set for distinguishing impregnated rubies and natural rubies (discount available for multiple purchases)

Sold out Limited to 20 stones! Includes 6 red gemstones of pigeon blood ruby ​​with AGL certificate. Discounts available for multiple purchases.

Limited to 20 stones! Includes 6 red gemstones of pigeon blood ruby ​​with AGL certificate. Discounts available for multiple purchases.
Sold out Limited Quantity: 2mm Benitoite (Top Quality Ice Blue) (Multiple Purchase Discounts Available)

Limited Quantity: 2mm Benitoite (Top Quality Ice Blue) (Multiple Purchase Discounts Available)

Sold out Limited to 22 Sapphire Gacha (Includes Sakura In-Cut & Sakura Shape Sapphire, Bonus Hot Pink Sapphire) (Multiple Purchase Discounts Available)

Limited to 22 Sapphire Gacha (Includes Sakura In-Cut & Sakura Shape Sapphire, Bonus Hot Pink Sapphire) (Multiple Purchase Discounts Available)

Sold out スリランカ産サファイア《ラトゥナプラ》1石ルース(平均0.75ct)

Gem Gacha💎 Sri Lankan Sapphire《Ratnapura》1 loose stone (average 0.75ct)《Multiple purchase discount available》

Sold out ブルーベリル（マシシベリル）＆ミントグリーンベリル2石セット

[Resale] Blue Beryl (Mashishi Beryl) & Mint Green Beryl 2 stone set《Multiple purchase discount available》

Sold out Kochi Prefecture Blood Red Coral Loose (6-8mm / damaged by water pressure during retrieval) "Multiple purchase discount available"

Kochi Prefecture Blood Red Coral Loose (6-8mm / damaged by water pressure during retrieval) "Multiple purchase discount available"

Sold out 《Limited to 18 Stones》Brazilian Paraiba Tourmaline Gacha with Sorting (CuO: 2.1%, MnO: 2.2%) Normally 45,800 JPY《Multiple Purchase Discount Available》

《Limited to 18 Stones》Brazilian Paraiba Tourmaline Gacha with Sorting (CuO: 2.1%, MnO: 2.2%) Normally 45,800 JPY《Multiple Purchase Discount Available》
Sold out [9/27 at 10 PM] TV Anime "Dr. STONE" × Jewelry Specialty Store KARATZ Collaboration Acrylic Keychain

[9/27 at 10 PM] TV Anime "Dr. STONE" × Jewelry Specialty Store KARATZ Collaboration Acrylic Keychain

Sold out 【宝石商の道具】冷却ヒビ入れ染色クォーツ・天然エメラルド見分け2点セット - KARATZ STORE｜カラッツSTORE

[Jeweler's Tools] Cooling Cracked Dyed Quartz/Natural Emerald Identification 2-piece Set (Discount available for multiple purchases)

Sold out 《Limited to 15 Stones》Ruby Gacha with 2 Pigeon Blood Rubies with Certificates (Synthetic Ruby as a Bonus)《Multiple Purchase Discount Available》

《Limited to 15 Stones》Ruby Gacha with 2 Pigeon Blood Rubies with Certificates (Synthetic Ruby as a Bonus)《Multiple Purchase Discount Available》
Sold out "Limited to 25 Sets" Kochi Prefecture Red Coral Branch (Raw Coral) & 2 Stone Loose Coral Set (March Birthstone, Coral) "Multiple Purchase Discount Available"

"Limited to 25 Sets" Kochi Prefecture Red Coral Branch (Raw Coral) & 2 Stone Loose Coral Set (March Birthstone, Coral) "Multiple Purchase Discount Available"
Sold out Limited Quantity: Russian Phenakite (Round Cut, 3mm) Loose Stone (Multiple Purchase Discounts Available)

Limited Quantity: Russian Phenakite (Round Cut, 3mm) Loose Stone (Multiple Purchase Discounts Available)
Sold out Gem gacha cut by Shimizu Kiseki and Yoichi Fukazawa 💎 {Multiple purchase discounts available} {Halloween specials included}

Gem gacha cut by Shimizu Kiseki and Yoichi Fukazawa 💎 {Multiple purchase discounts available} {Halloween specials included}

Sold out プリンセスカットダイヤモンド 2.0mm ルース（VSクラス相当）

Princess cut diamond 2.0mm loose (equivalent to VS class)《Multiple purchase discount available》

Sold out 《Limited to 14 stones》Windsor Sapphire Gacha 1 stone (bicolor, silky, color change, average 0.30ct) 《Multiple purchase discount available》

《Limited to 14 stones》Windsor Sapphire Gacha 1 stone (bicolor, silky, color change, average 0.30ct) 《Multiple purchase discount available》
Sold out Limited to 14 stones: 1 Cambodian Ratanakiri Blue Zircon (4mm) Multiple purchase discounts available

Limited to 14 stones: 1 Cambodian Ratanakiri Blue Zircon (4mm) Multiple purchase discounts available
Sold out Limited to 25 stones: Brazilian Paraiba Tourmaline (including bicolor, Batalha) rough stones, average size 0.1ct. Discounts for multiple purchases available.

Limited to 25 stones: Brazilian Paraiba Tourmaline (including bicolor, Batalha) rough stones, average size 0.1ct. Discounts for multiple purchases available.
Sold out Gem Gacha💎 Trapiche Diamond (Sliced ​​Diamond) 1 stone {Multiple purchase discount available}

Gem Gacha💎 Trapiche Diamond (Sliced ​​Diamond) 1 stone {Multiple purchase discount available}

Sold out [On sale 8/15 at 10 PM JST] Colombian Emerald Gacha featuring Shimizu Kisaki's 8mm Clover In-cut (regularly 79,800 JPY) - only 15 stones available! (Bonus green beryl included) [Multiple purchase discount available]

[On sale 8/15 at 10 PM JST] Colombian Emerald Gacha featuring Shimizu Kisaki's 8mm Clover In-cut (regularly 79,800 JPY) - only 15 stones available! (Bonus green beryl included) [Multiple purchase discount available]
Sold out "Limited 17 Stones" Emerald Gacha 💎 Win Koshu Kiseki Kiriko, rose cut, or mint green emeralds that normally retail for ¥88,800. 《Bulk purchase discount available》

"Limited 17 Stones" Emerald Gacha 💎 Win Koshu Kiseki Kiriko, rose cut, or mint green emeralds that normally retail for ¥88,800. 《Bulk purchase discount available》
Sold out 《New Tucson Arrivals・Limited to 13 Stones》Pakistani Lazurite (Azure Stone) Loose Stone《Multiple Purchase Discount Available》

《New Tucson Arrivals・Limited to 13 Stones》Pakistani Lazurite (Azure Stone) Loose Stone《Multiple Purchase Discount Available》
Sold out Ruby Lottery: Win a 0.59ct Pigeon Blood Ruby with AIGS or a Burmese Star Ruby (Multiple Purchase Discounts Available)

Ruby Lottery: Win a 0.59ct Pigeon Blood Ruby with AIGS or a Burmese Star Ruby (Multiple Purchase Discounts Available)
Sold out Limited to 20 stones: Russian Demantoid Garnet (Horsetail inclusions, approximately 2mm) - 1 loose stone. Discounts available for multiple purchases.

Limited to 20 stones: Russian Demantoid Garnet (Horsetail inclusions, approximately 2mm) - 1 loose stone. Discounts available for multiple purchases.

Sold out 《Limited to 20 Stones》Emerald Gacha: Win a 2.2ct Columbia Emerald Koshu-Kiseki Cut (normally 79,800 yen) or an Emerald Cat's Eye! 《Multiple Purchase Discount Available》

《Limited to 20 Stones》Emerald Gacha: Win a 2.2ct Columbia Emerald Koshu-Kiseki Cut (normally 79,800 yen) or an Emerald Cat's Eye! 《Multiple Purchase Discount Available》
Sold out Single loose Russian oil-free emerald (2.1mm, square cut) {Multiple purchase discounts available}

Single loose Russian oil-free emerald (2.1mm, square cut) {Multiple purchase discounts available}
Sold out 1 loose sapphire from Ratnapura, Sri Lanka (3.0mm-4.0mm, trilliant cut)《Multiple purchase discount available》

1 loose sapphire from Ratnapura, Sri Lanka (3.0mm-4.0mm, trilliant cut)《Multiple purchase discount available》

Sold out 《Limited to 12 items》 Blue Gemstone Gacha: Paraiba Tourmaline, Euclase, Tanzanite, etc. (Plus 1 Aquamarine)《Multi-purchase discount available》

《Limited to 12 items》 Blue Gemstone Gacha: Paraiba Tourmaline, Euclase, Tanzanite, etc. (Plus 1 Aquamarine)《Multi-purchase discount available》
Sold out Limited to 13 stones: Namibian Jeremejevite (Elemejevite) 1 stone loose stone (Multiple purchase discounts available)

Limited to 13 stones: Namibian Jeremejevite (Elemejevite) 1 stone loose stone (Multiple purchase discounts available)
Sold out 《Limited to 12 stones》Russian alexandrite and alexandrite from different origins (normally 69,800 yen) + free Sri Lankan chrysoberyl crystal《Multiple purchase discount available》

《Limited to 12 stones》Russian alexandrite and alexandrite from different origins (normally 69,800 yen) + free Sri Lankan chrysoberyl crystal《Multiple purchase discount available》
Sold out 《Limited to 16 stones》Cornflower Blue Sapphire with AIGS certificate, Royal Blue Sapphire with certificate, (Plus a beautiful yellow sapphire worth 5,980 yen as a bonus) 💎Blue Sapphire Gacha 《Multiple purchase discount available》

《Limited to 16 stones》Cornflower Blue Sapphire with AIGS certificate, Royal Blue Sapphire with certificate, (Plus a beautiful yellow sapphire worth 5,980 yen as a bonus) 💎Blue Sapphire Gacha 《Multiple purchase discount available》
Sold out Limited to 9 stones: Australian black opal (including semi-black opal) loose stone (includes a bonus white opal) (Multiple purchase discounts available)

Limited to 9 stones: Australian black opal (including semi-black opal) loose stone (includes a bonus white opal) (Multiple purchase discounts available)

Sold out Tanzanite 1 stone loose (5x7mm, oval cut) 《Multiple purchase discount available》

Tanzanite 1 stone loose (5x7mm, oval cut) 《Multiple purchase discount available》
Sold out 《限定12石》ブラジル産ラズライト（天藍石）1石ルース（初心者向け）《複数購入割引有》

1 stone loose Brazilian lazurite (for beginners)

KARATZ Custom Made

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.

KARATZ・Five Commitments

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.