Login
誕生石一覧

Birthstone list

Sort by
Sold out 《Limited to 7 stones》1 stone tourmaline in quartz from Sri Lanka loose (8-9mm, octagonal cut)《Multiple purchase discount available》

《Limited to 7 stones》1 stone tourmaline in quartz from Sri Lanka loose (8-9mm, octagonal cut)《Multiple purchase discount available》
Sold out Limited to 9 stones [Mr. Sanjay] Oil in quartz, spinel, yellow opal 1 loose stone (damaged) [Multiple purchase discount available]

Limited to 9 stones [Mr. Sanjay] Oil in quartz, spinel, yellow opal 1 loose stone (damaged) [Multiple purchase discount available]

Sold out Limited to 5 stones: 1 Veracruz amethyst rough stone (from Mexico, February birthstone) Multiple purchase discount

Limited to 5 stones: 1 Veracruz amethyst rough stone (from Mexico, February birthstone) Multiple purchase discount
Sold out Limited to 4 stones: 1 Brazilian white topaz loose stone (average 2.1 carats) Multiple purchase discounts available

Limited to 4 stones: 1 Brazilian white topaz loose stone (average 2.1 carats) Multiple purchase discounts available
Sold out Limited to 4 stones: 1 bicolor grossular garnet from Tanzania (multiple purchase discounts available)

Limited to 4 stones: 1 bicolor grossular garnet from Tanzania (multiple purchase discounts available)

Sold out One loose demantoid garnet from Russia (oval cut, approximately 3 x 2 mm) (multiple purchase discounts available)

One loose demantoid garnet from Russia (oval cut, approximately 3 x 2 mm) (multiple purchase discounts available)

Sold out One loose, oil-free emerald from Russia (2.2mm, round cut) (Multiple purchase discounts available)

One loose, oil-free emerald from Russia (2.2mm, round cut) (Multiple purchase discounts available)

Sold out Rainbow Garnet (Rose Cut, 3.0-5.5mm) from Tenkawa Village, Nara Prefecture, Single Loose Stone (Multiple Purchase Discounts Available)

Rainbow Garnet (Rose Cut, 3.0-5.5mm) from Tenkawa Village, Nara Prefecture, Single Loose Stone (Multiple Purchase Discounts Available)
Sold out Synthetic sapphire 1.416ct loose stone (synthetic pink sapphire)

Synthetic sapphire 1.416ct loose stone (synthetic pink sapphire)
Sold out 2.077ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)

2.077ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)
Sold out 2.393ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)

2.393ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)
Sold out American peridot 0.334ct loose stone

American peridot 0.334ct loose stone
Sold out モザンビーク産パライバトルマリン 0.229ctルース

Paraiba tourmaline from Mozambique 0.229ct loose
Sold out メキシコ産ファイアオパール 4.5mm/0.244ctルース

Mexican Fire Opal 4.5mm/0.244ct Loose
Sold out オーストラリア産ボルダーオパール 4.470ctルース

Australian boulder opal 4.470ct loose
Sold out Madagascar Bicolor Sapphire 3.6mm/0.232ct Loose

Madagascar Bicolor Sapphire 3.6mm/0.232ct Loose
Sold out Madagascar Sapphire 4.6mm/0.472ct Loose

Madagascar Sapphire 4.6mm/0.472ct Loose
Sold out Madagascar Bicolor Sapphire 4.5mm/0.637ct Loose

Madagascar Bicolor Sapphire 4.5mm/0.637ct Loose
Sold out Madagascar Bicolor Sapphire 5.8mm/1.006ct Loose

Madagascar Bicolor Sapphire 5.8mm/1.006ct Loose
Sold out Brazilian bicolor tourmaline 7.268ct loose stone

Brazilian bicolor tourmaline 7.268ct loose stone
Sold out Brazilian bicolor tourmaline 7.017ct loose stone

Brazilian bicolor tourmaline 7.017ct loose stone

Sold out Australian boulder opal 2.326ct loose

Australian boulder opal 2.326ct loose
Sold out 1.837ct loose Australian black opal

1.837ct loose Australian black opal
Sold out Australian white opal 1.928ct loose

Australian white opal 1.928ct loose
Sold out Rainbow Garnet (Andradite Garnet) 7.0mm/2.135ct Loose Stone from Tenkawa Village, Nara Prefecture

Rainbow Garnet (Andradite Garnet) 7.0mm/2.135ct Loose Stone from Tenkawa Village, Nara Prefecture
Sold out Australian Black Opal 0.825 ct Loose Stone

Australian Black Opal 0.825 ct Loose Stone
Sold out Colombian Trapiche Emerald 2.318ct Loose

Colombian Trapiche Emerald 2.318ct Loose
Sold out メキシコ産ファイアオパール 1.283ctルース

Mexican fire opal 1.283ct loose stone

Sold out Australian black opal 0.623ct loose stone

Australian black opal 0.623ct loose stone
Sold out Sri Lankan blue sapphire 0.645ct loose stone

Sri Lankan blue sapphire 0.645ct loose stone
Sold out Mozambique ruby ​​0.537ct loose stone

Mozambique ruby ​​0.537ct loose stone
Sold out [Sakura In-Cut] Mali Garnet (Grossular/Andradite Garnet) from the Republic of Mali, 6.0mm/0.920ct Loose Stone with Certificate of Authenticity

[Sakura In-Cut] Mali Garnet (Grossular/Andradite Garnet) from the Republic of Mali, 6.0mm/0.920ct Loose Stone with Certificate of Authenticity

Sold out 【12546396掲載】スリランカ産ゲーサイトイントパーズ 3.200ctルース

Sri Lankan Goethite Into Topaz 3.200ct loose

Sold out 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） 0.696ctルース

Andesine Labradorite from Madagascar (commonly known as Rainbow Moonstone) 0.696ct loose

Sold out オーストラリア産ボルダーオパール 1.730ctルース

Australian boulder opal 1.730ct loose

Sold out ダイヤモンド原石（メイカブル） 0.247ct原石

Yellow diamond rough stone (makeable) 0.247ct rough stone
Sold out Chrome tourmaline 0.300ct loose stone

Chrome tourmaline 0.300ct loose stone
Sold out バイカラータンザナイト 0.581ctルース

Bicolor tanzanite 0.581ct loose
Sold out Synthetic Opal 0.856ct Loose (Synthetic Water Opal)

Synthetic Opal 0.856ct Loose (Synthetic Water Opal)

Sold out Colombian emerald 3.0mm/0.098ct loose stone

Colombian emerald 3.0mm/0.098ct loose stone
Sold out Mali Garnet (Grossular/Andradite Garnet) 0.811ct Loose Stone from the Republic of Mali with Certificate of Authenticity

Mali Garnet (Grossular/Andradite Garnet) 0.811ct Loose Stone from the Republic of Mali with Certificate of Authenticity

Sold out [12/10 22:00 Sale] Pakistani Ludwigite Peridot 0.609ct Loose Stone

[12/10 22:00 Sale] Pakistani Ludwigite Peridot 0.609ct Loose Stone
Sold out Colombian emerald rough stone 11.155ct (with pyrite)

Colombian emerald rough stone 11.155ct (with pyrite)
Sold out [12/7 22:00] Sri Lankan Yellow Sapphire 0.508ct Loose

[12/7 22:00] Sri Lankan Yellow Sapphire 0.508ct Loose
Sold out [On Sale at 10 PM on December 7th] Madagascar Andesine Labradorite Moonstone (also known as Rainbow Moonstone) 0.178ct Loose Stone

[On Sale at 10 PM on December 7th] Madagascar Andesine Labradorite Moonstone (also known as Rainbow Moonstone) 0.178ct Loose Stone
Sold out [On Sale at 10 PM on December 7th] Rainbow Garnet (Andradite Garnet) 2.365ct Loose Stone from Tenkawa Village, Nara Prefecture

[On Sale at 10 PM on December 7th] Rainbow Garnet (Andradite Garnet) 2.365ct Loose Stone from Tenkawa Village, Nara Prefecture
Sold out ロシア産デマントイドガーネット（ホーステール認む） 1.058ctルース

Russian demantoid garnet (horsetail recognized) 6.3mm/1.058ct loose
Sold out スターガーネット 14.600ctルース

Star garnet 14.600ct loose

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.