Birthstone list

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Cornflower Blue Sapphire 0.680ct Loose AIGS

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Diamond 0.096ct loose (D, SI1, octagonal cut)

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Diamond 0.126ct loose (F, VS2, octagonal cut)

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Paraiba tourmaline from Brazil 0.243ct loose

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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） 0.666ctルース

Andesine Labradorite from Madagascar (commonly known as Rainbow Moonstone) 0.666ct loose

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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） 0.570ctルース

Andesine Labradorite (commonly known as Rainbow Moonstone) from Madagascar 0.570ct loose

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Paraiba tourmaline from Brazil 0.066ct loose

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[Sakura In-Cut] Tanzanite from Tanzania 6.0mm/0.774ct Loose Stone

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K18/Pt950 Brazilian Paraiba tourmaline 0.071ct diamond ring (K18YG, CuO: 1.9%, MnO: 2.2%)

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18K Yellow Gold Brazilian Paraiba Tourmaline 0.048ct Diamond Pinky Ring (CuO: 1.7%, MnO: 2.2%)

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K18/Pt950 Brazilian Paraiba Tourmaline and Diamond Pendant Top (Necklace Top)

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Rough diamond (sawable) 0.466ct rough diamond (with trigon)

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0.245ct rough diamond (with trigon)

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Mozambique Ruby 0.481ct Loose Stone with Certificate of Authenticity

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Tanzanian Violet Sapphire 0.920ct Loose

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Afghanistan Blue Tourmaline 4.0mm/0.268ct Loose Stone (Lagoon Tourmaline)

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Unheated Burmese Ruby 0.227ct Loose Stone, Nikko Kan

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Cornflower Blue Sapphire 4.5mm/0.430ct Loose Stone AIGS

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Brazilian Blue Topaz Cat's Eye 15mm/22.761ct Loose Stone

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Tanzanian Dragon Garnet 1.181ct Loose Stone

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Tanzanian Dragon Garnet 1.042ct Loose Stone

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1.175ct loose Australian white opal

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Unheated star ruby from Myanmar, 0.617ct loose

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Royal Blue Sapphire 1.00ct Loose AIGS

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0.361ct loose Brazilian Paraiba Tourmaline (CuO:1.0%, MnO:3.6%)

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Brazilian Paraiba tourmaline 0.128ct loose stone (CuO: 1.7%, MnO: 3.4%)

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Unheated Pigeon Blood Ruby 0.710ct Loose Stone AIGS

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Indian Moonstone 5.0mm/0.474ct Loose Stone (Rose Cut)

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Russian demantoid garnet cat's eye (horsetail recognized) 0.171ct loose

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Russian demantoid garnet cat's eye (horsetail recognized) 0.222ct loose

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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） 0.167ctルース

Andesine Labradorite (also known as Rainbow Moonstone) 3.6mm/0.167ct loose stone

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Bicolor sapphire from Madagascar 0.259ct loose

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Bicolor sapphire from Madagascar 0.198ct loose

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Bicolor sapphire from Madagascar 0.212ct loose

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Brazilian Trapichea Amethyst 24.772ct loose with patch

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Opal 6mm/0.595ct loose (rose cut)

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Aquamarine cat's eye 3.528ct loose

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Unheated silky pink sapphire from Vietnam 0.197ct loose

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Russian demantoid garnet (horsetail recognized) 6.3mm/1.058ct loose

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Russian Demantoid Garnet (Horsetail) 4.2mm/0.325ct Loose Stone

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[On Sale at 10 PM on December 7th] Rainbow Garnet (Andradite Garnet) 2.365ct Loose Stone from Tenkawa Village, Nara Prefecture

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[On Sale at 10 PM on December 7th] Madagascar Andesine Labradorite Moonstone (also known as Rainbow Moonstone) 0.178ct Loose Stone

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[12/7 22:00] Sri Lankan Yellow Sapphire 0.508ct Loose

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[On Sale at 10 PM on December 9th] American Peridot 0.855ct Loose Stone (Lily Pad Inclusions)

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.