Birthstone list

[Available at 10 PM on December 13th] Limited to 9 stones: Australian Black Opal (including semi-black opal) Loose Stone Gacha (Includes 1 bonus white opal) [Multiple purchase discounts available] Sale price¥5,980

[12/12 10 PM Sale] Limited to 15 stones! Includes a rare UNEVEN Fancy color gemstone (normally ¥39,800) and a 0.428ct Fancy color gemstone (¥69,800). Get one loose yellow diamond! Discounts available for multiple purchases. Sale price¥3,980

[On sale 12/6 at 10 PM] Limited to 20 gems! Includes 6 red gemstones, including pigeon blood ruby rubies with AGL certificates. Discounts available for multiple purchases. Sale price¥6,980

[12/13 10 PM Sale] {Limited to 13 Stones} Tourmaline Gacha: Including Indigolite Tourmaline worth ¥50,000 and Rubellite worth ¥60,000. Plus, get one Canary Yellow Tourmaline. {Multiple Purchase Discounts Available} Sale price¥5,980

December Special Campaign: Limited to 14 stones. December birthstone: Tanzanite, loose stone (5x7mm, oval cut). Multiple purchase discounts available. Sale price¥8,800

Limited to 14 stones: Beryllium-heated sapphire (3.5mm, KEN cut) - 1 loose stone. Discounts available for multiple purchases. Sale price¥1,580

[Available at 10 PM on November 24th] Limited Edition (12 stones) VS Equivalent Fluorescent Diamond Gacha with Bonus Mini Slice Diamond (Multiple Purchase Discounts Available) Sale price¥6,980

Unheated silky pink sapphire from Vietnam 0.197ct loose Sale price¥8,800

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

Star garnet 14.600ct loose Sale price¥11,000

Russian demantoid garnet (horsetail recognized) 6.3mm/1.058ct loose Sale price¥398,000

[12/17 22:00 Sale] Russian Demantoid Garnet (Horsetail Certified) 4.2mm/0.325ct Loose Stone Sale price¥59,800

[On Sale at 10 PM on December 7th] Rainbow Garnet (Andradite Garnet) 2.365ct Loose Stone from Tenkawa Village, Nara Prefecture Sale price¥12,800

[12/14 22:00] American Peridot 5.1mm/0.573ct Loose Stone Sale price¥9,800

[12/14 22:00 Sale] Mexican Water Opal (Faceted) 0.402ct Loose (Contrarus Opal) Sale price¥12,800

[12/14 22:00 Sale] 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

[12/7 22:00] Sri Lankan Yellow Sapphire 0.508ct Loose Sale price¥18,800

[12/13 22:00 Sale] 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

[12/14 22:00] Colombian Emerald Rough 11.155ct (with Pyrite) Sale price¥22,800

[12/10 22:00 Sale] Pakistani Ludwigite Peridot 0.609ct Loose Stone Sale price¥6,980

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

[12/14 22:00] Brazilian Pink Tourmaline 5.0mm/0.484ct Loose Stone (Rose Cut) Sale price¥8,800

[12/10 22:00] Mali Garnet (Grossular/Andradite Garnet) 1.008ct Loose Stone from the Republic of Mali with Certificate of Authenticity Sale price¥35,800

[12/12 22:00 Sale] Mali Garnet (Grossular/Andradite Garnet) 0.811ct Loose Stone from the Republic of Mali with Certificate of Authenticity Sale price¥29,800

[12/12 22:00 Sale] Mali Garnet (Grossular/Andradite Garnet) 0.741ct Loose Stone from the Republic of Mali with Certificate of Authenticity Sale price¥25,800

[12/14 22:00] Colombian Emerald 3.0mm/0.098ct Loose Stone Sale price¥12,800

[12/12 22:00 Sale] Synthetic Opal 0.856ct Loose (Synthetic Water Opal) Sale price¥8,800

[12/13 22:00 Sale] Brazilian Green Tourmaline 0.821ct Loose Stone Sale price¥12,800

Chrome tourmaline 0.300ct loose stone Sale price¥2,980

Yellow diamond rough stone (makeable) 0.247ct rough stone Sale price¥22,800

Mexican cantera opal 15.542ct loose Sale price¥15,800

Mexican cantera opal 9.422ct loose Sale price¥25,800

Mexican cantera opal 7.563ct loose Sale price¥15,800

Australian boulder opal 1.730ct loose Sale price¥8,800

Australian boulder opal 6.980ct loose Sale price¥6,980

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） 0.696ctルース

Andesine Labradorite from Madagascar (commonly known as Rainbow Moonstone) 0.696ct loose Sale price¥6,980

【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 Sale price¥4,980

Australian boulder opal 4.470ct loose Sale price¥25,800

Yellow opal 17.283ct loose Sale price¥29,800

White topaz 16.06ct loose Sale price¥25,800

Bicolor grossular garnet 0.782ct loose Sale price¥12,800

Paraiba tourmaline from Mozambique 0.207ct loose Sale price¥9,800

Mexican Fire Opal 4.5mm/0.244ct Loose Sale price¥9,800

Diamond 0.052ct loose (trapeze cut, VS class equivalent) Sale price¥6,980

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.