5 major gems

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Sri Lankan Blue Sapphire 4.0mm/0.414ct Loose Stone

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Unheated silky sapphire from Sri Lanka 0.902ct loose stone

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Unheated silky sapphire from Sri Lanka 0.721ct loose stone

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Madagascar sapphire 0.550ct loose stone

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Madagascar White Sapphire 0.490ct Loose JTL

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Zimbabwe sliced trapiche diamond 0.206ct loose

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Sri Lankan Yellow Sapphire 0.826ct Loose

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Brown diamond (sugarloaf cut) 0.278ct loose (SI class equivalent)

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K18YGアフガニスタン産クンツァイト 0.74ct・タンザナイト・サファイアリング

K18YG Afghan Kunzite 0.74ct, Tanzanite, Sapphire Ring

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Colombian emerald rough stone 37.764ct (Gachala mine)

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K18YG Myanmar Ruby, Padparadscha Color Sapphire, Yellow Diamond Pendant (Necklace)

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K18YG アメリカ産オレゴンサンストーン 0.676ct ・パパラカラーサファイア・ブラウンダイヤモンド・ペンダントトップ（ネックレストップ）

K18YG Oregon Sunstone 0.676ct from the United States, Padparadscha Color Sapphire, Brown Diamond Pendant (Necklace)

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Water Play 13 Stone Set (Santa Maria Aquamarine, Sea Blue Chalcedony, Blue Zircon, Diamond, etc.) Half Eternity Ring Set (2.0mm)

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Camellia 13-stone set (Imperial topaz, Oregon sunstone, Andalusite, Padparadscha color sapphire, etc.) Half eternity ring set (2.0mm)

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Green Garden 13 Stone Set (Emerald, Demantoid Garnet, Grandidierite, etc.) Half Eternity Ring Set (2.0mm)

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Night purple 13 stone set (hackmanite, tanzanite, black spinel, diamond, etc.) Half eternity ring set (2.0mm)

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ダイヤモンド 4.1mm/0.263ルース(I, VVS2, 3Excellent H&C)

Diamond 4.1mm/0.263 Loose (I, VVS2, 3Excellent H&C)

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ダイヤモンド 3.8mm/0.200ルース(E, VVS1, VeryGood)

Diamond 3.8mm/0.200 loose (E, VVS1, VeryGood)

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ダイヤモンド 3.8mm/0.220ルース(H, VS1, 3Excellent H&C)

Diamond 3.8mm/0.220 Loose (H, VS1, 3Excellent H&C)

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ダイヤモンド 3.8mm/0.209ルース(G, VVS1, 3Excellent H&C)

Diamond 3.8mm/0.209 Loose (G, VVS1, 3Excellent H&C)

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Ethiopian Opal 24.319ct Rough Stone

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Madagascar sapphire 0.158ct loose stone

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Madagascar sapphire 0.157ct loose stone

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Silky pink sapphire from Madagascar 0.468ct loose stone

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Silky pink sapphire from Madagascar 0.457ct loose stone

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Australian white opal 3.138ct loose

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Australian white opal 1.830ct loose

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Ethiopian honeycomb opal 2.414ct loose stone

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Lab-grown diamond (synthetic green diamond) 13 stone half eternity ring set (2.0mm)

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Pt900 Tanzanian Malaya Garnet 2.01ct Diamond Pendant (Necklace)

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Blue sapphire 3.9mm/0.279ct loose stone

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Blue sapphire 3.9mm/0.260ct loose stone

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Madagascar Purple Sapphire 0.440ct Loose

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Mexican Opal (Faceted Cut) 0.550ct Loose

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【12554800掲載】アンゴラ産グリーンダイヤモンド原石（ソーヤブル） 0.524ct原石

Angola Green Diamond Rough (Sawable) 0.524ct Rough (Trigon)

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Kenyan Gold Sheen Sapphire 4.0mm/0.321ct Loose Stone (Rose Cut)

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Blue sapphire 0.217ct loose stone

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Canary Yellow Diamond (Treatment) 0.260ct Loose (FANCY INTENSE GREENISH YELLOW*, SI-2)

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Pt900 Colombian emerald 0.60ct diamond 0.19ct ring

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Pt900 Russian Demantoid Garnet (Horsetail certified) 4.3mm/0.33ct, Diamond 0.48ct Ring

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Unheated Mozambique Ruby 0.220ct Loose

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Colombian Trapiche Emerald 1.341ct Loose

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アンゴラ産グリーンダイヤモンド原石（ソーヤブル） 0.491ct原石（トライゴン）

Angola Green Diamond Rough (Sawable) 0.491ct Rough (Trigon)

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Unheated Ruby 0.330ct Loose AIGS

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Burmese unheated ruby 0.245ct loose stone by Nikkei

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Madagascar sapphire 3.0mm/0.126ct loose stone

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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.