Birthstone list

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Ruby 0.289ct loose stone by Takakikyo

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【12562637掲載】マラウイ産ムーンストーン（マラウイムーンストーン） 2.808ctルース

2.808ct Malawi Moonstone Loose

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[On sale May 10th at 10 PM] Sri Lankan Bi-Color Sapphire 0.302ct Loose Stone

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Unheated Pigeon Blood Ruby 0.260ct Loose Stone AIGS

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[Yukinko Cut] Synthetic Sapphire 2.220ct Loose (Synthetic Blue Sapphire)

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Canadian raw diamond (sawable) 0.328ct raw (with trigons)

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マダガスカル産アンデシン・ラブラドライト（通称名レインボームーンストーン） 0.463ctルース

0.463 ct Loose Madagascar Andesine-Labradorite (Common Name: Rainbow Moonstone)

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[Sakura Shape] Synthetic Sapphire 3.285ct Loose Stone

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Peruvian Bi-Color Blue Opal 2.707ct Loose Stone

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Peruvian Bicolor Blue Opal 3.757ct Loose Stone

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[On sale May 3rd, 10 PM JST] Peruvian Bi-Color Blue Opal 4.067ct Loose Stone

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Peruvian Bicolor Blue Opal 4.862ct Loose

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[Dandelion Cut] Brazilian Tourmaline 11mm/5.620ct Loose Stone with Certification by Shimizu Kisetsu [Limited to 1 Piece] ¥59,800 Item No. 12562697

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Brazilian Bicolor Tourmaline 4.554ct Loose Stone with Certification

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0.133ct Loose Blue Sapphire from Madagascar

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Tanzanian Rhodolite Garnet 0.410 ct Loose Stone

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Loose 0.264ct Sri Lankan Blue Sapphire

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Sri Lankan Blue Sapphire 5.5mm/0.826ct Loose Stone

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【Sale from 10 PM on May 5th】Mexican Opal 0.244 ct Loose Stone (Contraluz Opal)

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Untreated Sri Lankan Star Sapphire 0.403 ct Loose

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Unheated Sri Lankan Star Sapphire 0.361ct Loose

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0.430ct Unheated Sapphire Loose Stone from Kashmir

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K18YG Brazilian Paraiba Tourmaline 0.064ct Ring (CuO:1.9%, MnO:2.4%)

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Diamond 0.185ct Loose Stone (I, SI1, Ashoka Cut)

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K18 Red Coral from Kochi Prefecture (0.41ct), Diamond (0.03ct) Ring

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K18 Blood Coral from Kochi Prefecture (0.56ct), Diamond (0.08ct) Ring

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[Published 12562689] Mexican Water Opal 1.018ct Loose Stone

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0.260ct Loose Parti-Color Paraiba Tourmaline from Brazil

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【12562747掲載】マダガスカル産非加熱ティールグリーンサファイア 1.740ctルース

Madagascar Unheated Teal Green Sapphire 1.74ct Loose GIA

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[On sale May 6, 10 PM JST] Mexican Cantera Opal Loose Stone, 2.096 ct

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Mexican Cantera Opal 5.410 ct Loose Stone

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Mexican Cantera Opal 8.097ct Loose

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Pink Diamond 2.3mm/0.049ct Loose Stone (FANCY PINK, VS-1) Central Gem Lab

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ピンクダイヤモンド 0.060ctルース(FANCY INTENSE PINK, VS-2)

Pink Diamond 0.060ct Loose (FANCY INTENSE PINK, VS-2) CBT

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カメレオンダイヤモンド 0.153ctルース(LIGHT GRAY GREEN, SI-1)

Chameleon Diamond 0.153ct Loose (LIGHT GRAY GREEN, SI-1)

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【32501878掲載】グレーダイヤモンド 0.109ctルース(VERY LIGHT GRAY, SI-1)

Gray Diamond 3.0mm/0.109ct Loose (VERY LIGHT GRAY, SI-1)

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【Karafuri】Pt900 Cantera Opal 7.809ct and Diamond 0.19ct Pendant Top

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Colombian mica in emerald 1.314ct loose

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Brazilian bicolor tourmaline 7.445ct loose stone

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Tanzanian Bicolor Tanzanite 0.419 ct Loose Stone

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奈良県天川村産レインボーガーネット（アンドラダイトガーネット） 0.922ctルース

Rainbow garnet (andradite garnet) from Tenkawa Village, Nara Prefecture 0.922ct loose

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Mexican Fire Opal 0.290ct Loose (Faceted Cut)

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Ethiopian honeycomb opal 3.566ct loose stone

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Brazilian Paraiba Tourmaline 0.216ct loose stone (CuO:1.2%, MnO:2.7%)

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Paraiba tourmaline from Mozambique 1.581ct loose stone (CuO: 0.5%, MnO: 1.0%)

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.