Birthstone list
Tanzanian Lavender Tanzanite 0.558ct Loose Stone
Sale price¥12,800
Tanzanian bicolor tanzanite 0.573ct loose stone
Sale price¥12,800
Tanzanian Lavender Tanzanite 0.577ct Loose Stone
Sale price¥12,800
Brazilian Pink Tourmaline 0.418ct Loose Stone (Rouge Cut)
Sale price¥8,800
Russian rough diamond (sawable) 0.088ct loose
Sale price¥19,800
Brazilian Paraiba Tourmaline 0.360ct Loose GIA
Sale price¥298,000
Sri Lankan Yellow Sapphire 0.349ct Loose
Sale price¥12,800
Brazilian Green Tourmaline 0.376ct Loose Stone
Sale price¥7,980
Brazilian Green Tourmaline 0.332ct Loose Stone
Sale price¥7,980
Tanzanite from Tanzania 0.497ct loose stone
Sale price¥9,800
Tanzanite from Tanzania 0.245ct loose stone
Sale price¥8,800
Tanzanite from Tanzania 0.385ct loose stone
Sale price¥8,800
Australian black opal 3.242ct loose stone
Sale price¥59,800
Almandine Garnet 1.471ct Loose Stone
Sale price¥14,800
Almandine Garnet 1.388ct Loose Stone
Sale price¥11,800
Almandine Garnet 1.988ct Loose Stone
Sale price¥16,800
Almandine Garnet 1.485ct Loose Stone
Sale price¥15,800
Almandine Garnet 1.058ct Loose Stone
Sale price¥12,800
Blue sapphire 0.287ct loose
Sale price¥12,800
Brazilian Paraiba Tourmaline 0.060ct Loose (CuO:1.6%, MnO:2.3%)
Sale price¥42,800
Russian Diamond Rough (Sawable) 0.103ct Loose (Trigon)
Sale price¥25,800
Tanzanian Rhodolite Garnet 0.448ct Loose Stone
Sale price¥6,980
Tanzanian Rhodolite Garnet 0.810ct Loose Stone
Sale price¥9,800
American Herkimer Diamond (Rock Crystal) 5.5mm/0.528ct Loose
Sale price¥8,800
Indian Moonstone 8mm/1.879ct Loose
Sale price¥6,980
Ceylon ice blue sapphire, 1.134 ct, loose, with gemological report
Sale price¥45,800
Unheated Ruby, 0.207 ct, Loose Stone, Hōki Kyō
Sale price¥69,800
Bolivian Ametrine 36.887ct loose stone
Sale price¥79,800
YAG (Yttrium Aluminum Garnet) 4.9mm/0.574ct loose stone
Sale price¥8,800
Mexican Fire Opal 0.718ct Loose
Sale price¥9,800
Mexican Fire Opal 0.593ct Loose (Faceted Cut)
Sale price¥9,800
Nigerian bicolor tourmaline 0.379ct loose stone
Sale price¥6,980
Tanzanian green sapphire 0.303ct loose stone
Sale price¥8,800
Colombian mint color emerald 0.297ct loose stone
Sale price¥8,800
[12550887] Paraiba Tourmaline from Mozambique 0.784ct loose stone
Sale price¥128,000
Madagascar sapphire 0.448ct loose stone
Sale price¥15,800
[Calafuri] K18 Blue Sapphire and Diamond Ring Appraisal Report
Sale price¥128,000
Sri Lankan Silky Sapphire 5.1mm/0.488ct Rose Cut Loose Gemstone
Sale price¥7,980
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.
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.