Birthstone list

Mexican Water Opal 1.790ct Loose (Contralus Opal) Sale price¥29,800

K18/Pt950 Brazilian Paraiba Tourmaline and Diamond Pendant Top (Necklace Top) Sale price¥89,800

Rough diamond (sawable) 0.466ct rough diamond (with trigon) Sale price¥98,000

Diamond rough (makeable) 0.204ct rough Sale price¥39,800

0.604ct rough diamond Sale price¥12,800

Brazilian green tourmaline 4.345ct loose stone Sale price¥69,800

Tanzanite from Tanzania 2.777ct loose stone Sale price¥98,000

Brazilian Blue Tourmaline 0.827ct Loose Stone Sale price¥19,800

Sri Lankan Twin Star Sapphire 5.225ct Loose Sale price¥98,000

Sri Lankan triple star sapphire 1.743ct loose stone Sale price¥128,000

Sri Lankan Twin Star Sapphire 3.928ct Loose Sale price¥128,000

Brazilian Indigolite Tourmaline 0.421ct Loose Stone with Certificate of Authenticity Sale price¥35,800

Colombian emerald 0.091ct loose stone Sale price¥15,800

Tanzanian Dragon Garnet 1.042ct Loose Stone Sale price¥28,800

Mexican Water Opal (Faceted) 0.215ct Loose (Contrarus Opal) Sale price¥18,800

Brazilian Indigolite Tourmaline 1.470ct Loose Stone with Certificate of Authenticity Sale price¥98,000

Colombian emerald 3.3mm/0.131ct loose stone Sale price¥25,800

1.175ct loose Australian white opal Sale price¥9,800

Parasitic Peridot 0.241ct Loose Stone, Japan-Germany Scale Sale price¥98,000

Brazilian Paraiba Tourmaline 0.115ct Loose (CuO:2.0%, MnO:0.6%) Sale price¥59,800

Bekiri Blue Garnet (Color Change Garnet) from Madagascar, 0.183ct Loose Sale price¥18,800

Madagascar Bekiri Blue Garnet (Color Change Garnet) 0.189ct Loose Stone Sale price¥18,800

Madagascar Bekily Blue Garnet (Color Change Garnet) 0.221ct Loose Stone Sale price¥22,800

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） 0.177ctルース

Andesine Labradorite (commonly known as Rainbow Moonstone) 0.177ct loose Sale price¥8,800

Mint green sapphire 0.348ct loose Sale price¥9,800

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 Sale price¥4,980

Mint color tourmaline 0.198ct loose Sale price¥4,980

Mint color tourmaline 0.229ct loose Sale price¥4,980

Pink tourmaline 0.205ct loose Sale price¥4,980

Bicolor sapphire from Madagascar 0.252ct loose Sale price¥9,800

Bicolor sapphire from Madagascar 0.265ct loose Sale price¥16,800

Bicolor sapphire from Madagascar 0.198ct loose Sale price¥7,980

Mexican water opal 0.212ct loose (contrarus opal) Sale price¥18,800

Tourmaline cat's eye 0.910ct loose Sale price¥4,980

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） 0.618ctルース

Andesine Labradorite from Madagascar (commonly known as Rainbow Moonstone) 0.618ct loose Sale price¥5,980

Unheated silky pink sapphire from Vietnam 0.247ct loose Sale price¥8,800

Russian Demantoid Garnet (Horsetail) 4.2mm/0.325ct Loose Stone Sale price¥59,800

American Peridot 5.1mm/0.573ct Loose Stone Sale price¥9,800

Mexican Water Opal (Faceted) 0.402ct Loose (Contrarus Opal) Sale price¥12,800

[12/7 22:00 Sale] Mexican Egg-in Opal 0.381ct Loose Sale price¥18,800

Tanzanian Chrome Tourmaline 0.164ct Loose Stone Sale price¥9,800

[On Sale at 10 PM on December 7th] Madagascar Andesine Labradorite Moonstone (also known as Rainbow Moonstone) 0.178ct Loose Stone Sale price¥9,800

[12/7 22:00] Brazilian Rubellite 0.332ct Loose Stone Sale price¥12,800

[12/7 22:00] American Peridot 0.385ct Loose Stone Sale price¥8,800

Sri Lankan Yellow Sapphire 0.343ct Loose Sale price¥12,800

[On Sale at 10 PM on December 9th] American Peridot 0.855ct Loose Stone (Lily Pad Inclusions) Sale price¥12,800

[12/10 22:00 Sale] Indian Moonstone 6.1mm/0.878ct Loose Stone (Rose Cut) Sale price¥8,800

Brazilian Pink Tourmaline 5.0mm/0.484ct Loose Stone (Rose Cut) Sale price¥8,800

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.