Birthstone list

Mexican Fire Opal 8.0mm/1.270ct Loose Sale price¥29,800

[Sakura Shape] Mexican Opal 2.551ct Loose Patch Sale price¥59,800

[Rouge cut] Almandine garnet 2.476ct loose stone Sale price¥9,800

[Takeshi Yamamoto] Ametrine 20.856ct loose stone Sale price¥98,000

Synthetic Opal (Synthetic Black Opal) 0.723ct Loose Sale price¥15,800

Synthetic Opal (Synthetic Black Opal) 0.651ct Loose Sale price¥15,800

Mexican Fire Opal 1.755ct Loose Sale price¥29,800

Mexican Fire Opal 1.341ct Loose Sale price¥39,800

Sri Lankan Yellow Sapphire 0.253ct Loose Sale price¥8,800

Sri Lankan Yellow Sapphire 0.226ct Loose Sale price¥8,800

Sri Lankan Yellow Sapphire 0.272ct Loose (Bicolor) Sale price¥12,800

Sri Lankan Yellow Sapphire 0.543ct Loose Sale price¥29,800

Indian Moonstone 8.2mm/1.823ct Loose Sale price¥14,800

Unheated Mozambique Ruby 0.220ct Loose Sale price¥25,800

Colombian emerald 3.5mm/0.150ct loose stone Sale price¥22,800

Brazilian bicolor tourmaline 0.763ct loose stone Sale price¥7,980

Brazilian bicolor tourmaline 1.177ct loose stone Sale price¥12,800

Colombian Trapiche Emerald 1.341ct Loose Sale price¥6,980

Tanzanian bicolor tanzanite 3.018ct rough and loose stone set of 2 Sale price¥6,980

Montana Sapphire 3.3mm/0.158ct Loose (Green Sapphire) Sale price¥15,800

Brazilian bicolor tourmaline 0.914ct loose stone Sale price¥12,800

Tanzanite from Tanzania 1.36ct loose stone Sale price¥49,800

Unheated Ruby 0.330ct Loose AIGS Sale price¥35,800

Pt900 Colombian emerald 0.72ct, diamond 0.61ct ring Sale price¥158,000

Pt900/Pt850 Australian Black Opal 0.37ct Diamond 0.73ct Necklace Sale price¥198,000

Unheated Brazilian Paraiba Tourmaline 0.043ct loose stone (CuO: 1.2%, MnO: 2.3%) Sale price¥45,800

Unheated Brazilian Paraiba Tourmaline 0.044ct loose stone (CuO: 1.6%, MnO: 2.8%) Sale price¥39,800

Madagascar sapphire 3.0mm/0.126ct loose stone Sale price¥8,800

Emerald 0.484ct loose Sale price¥18,800

Emerald 0.156ct loose stone Sale price¥8,800

Color shift amethyst 4.191ct loose stone Sale price¥14,800

Color shift amethyst 1.216ct loose stone Sale price¥8,800

Madagascar Pink Tourmaline 0.543ct Loose Stone Sale price¥14,800

Tanzanite from Tanzania 4.6mm/0.429ct loose stone Sale price¥12,800

Tanzanite from Tanzania 0.478ct loose stone Sale price¥9,800

Tanzanite from Tanzania 0.351ct loose stone Sale price¥9,800

Bekiri Blue Garnet (Color Change Garnet) from Madagascar 0.161ct Loose Stone Sale price¥22,800

Limited quantity: 1 impregnated ruby loose (4mm, round cut, identification instructions included) Multiple purchase discounts available Sale price¥1,980

Australian Green Opal 4.990ct Loose Sale price¥9,800

Brazilian bicolor tourmaline 0.582ct loose stone Sale price¥6,980

Pakistan Ruby in Quartz 1.429ct Loose Stone Sale price¥12,800

Australian black opal 0.386ct loose stone Sale price¥39,800

Limited to 6 stones: 1 loose Madagascar needle-in topaz (average 1.8 carats) Multiple purchase discounts available Sale price¥3,980

Limited to 4 sets: Sri Lankan sapphire (2.5mm, round cut) and Sri Lankan glass body set of 2 stones. Discounts available for multiple purchases. Sale price¥3,980

Limited to 9 sets: Sri Lankan sapphire (3.0-3.5mm, round cut) and Sri Lankan glass body set of 2 stones. Discounts available for multiple purchases. Sale price¥5,980

YAG (Yttrium Aluminum Garnet) 7.0mm/1.772ct loose stone Sale price¥9,800

Brazilian bicolor tourmaline 1.209ct loose stone Sale price¥9,800

Montana Sapphire (Blue Sapphire) 0.207ct Loose 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.