Birthstone list
Sierra Leone sapphire 1.470ct loose
Sale price¥14,800
Sierra Leone sapphire 1.210ct loose
Sale price¥9,800
Bicolor star sapphire from Myanmar 1.190ct loose (pink sapphire)
Sale price¥29,800
Paracytic peridot 0.536ct loose
Sale price¥188,000
Tanzanite 0.810ct loose stone
Sale price¥12,800
Tanzanite 2.358ct loose
Sale price¥69,800
Ruby 0.472ct loose
Sale price¥6,980
Ruby 0.194ct loose
Sale price¥8,800
Pink tourmaline 1.404ct loose stone
Sale price¥19,800
Pink tourmaline 0.482ct loose stone
Sale price¥6,980
Bicolor tourmaline 0.591ct loose (rose cut)
Sale price¥9,800
Bicolor tourmaline 0.435ct loose (rose cut)
Sale price¥6,980
Pt950 Oregon Sunstone 1.24ct Indigo Tourmaline Blue Diamond Ring
Sale price¥98,000
Pt950 Benitoite 0.10ct Aquamarine Blue Diamond Ring
Sale price¥98,000
Bicolor pink star sapphire from Mogok 0.360ct loose
Sale price¥24,800
Bicolor sapphire 0.292ct loose
Sale price¥25,800
Brazilian Paraiba tourmaline 0.226ct loose (CuO:0.7%, MnO:2.5%)
Sale price¥45,800
YAG (Yttrium Aluminum Garnet) 6.5mm/1.548ct loose stone
Sale price¥12,800
YAG (Yttrium Aluminum Garnet) 6.5mm/1.774ct loose stone
Sale price¥12,800
YAG (yttrium aluminum garnet) 1.792ct loose
Sale price¥12,800
Unheated Brazilian Color Change Paraiba Tourmaline 0.30ct Loose GIA
Sale price¥1,280,000
Brazilian particolor Paraiba tourmaline 0.26ct loose GIA
Sale price¥598,000
[Camellia cut] Mexican fire opal 1.270ct loose with patch
Sale price¥98,000
[Panda cut] Moonstone 5.476ct loose
Sale price¥8,800
Royal blue sapphire 1.44ct loose GIA
Sale price¥188,000
Russian demantoid garnet (horsetail recognized) 0.291ct loose
Sale price¥49,800
[Cat cut] Rubellite 7mm/1.540ct loose
Sale price¥19,800
Paraiba tourmaline from Brazil 0.154ct loose (CuO:1.1wt%, MnO:1.4wt%)
Sale price¥128,000
Colombian emerald cat's eye 0.190ct loose
Sale price¥15,800
Brazilian Paraiba tourmaline 0.275ct loose (CuO:1.5%.MnO:2.3%)
Sale price¥358,000
Rubellite 2.115ct loose Japanese-German book
Sale price¥88,800
American Anthill Garnet (Chrome Pyrope Garnet) 5mm/0.540ct Loose
Sale price¥22,800
Brazilian pink imperial topaz 0.322ct loose
Sale price¥12,800
Color change garnet from Madagascar 0.648ct loose
Sale price¥9,800
Color change garnet from Madagascar 0.855ct loose
Sale price¥12,800
Brazilian imperial topaz 0.467ct loose
Sale price¥15,800
Sri Lankan white sapphire 2.9mm/0.086ct loose (rose cut)
Sale price¥5,980
Australian boulder opal 28.880ct loose
Sale price¥69,800
Australian boulder opal 1.675ct loose
Sale price¥29,800
Australian boulder opal 1.868ct loose
Sale price¥29,800
Australian boulder opal 0.982ct loose
Sale price¥6,980
Australian boulder opal 1.173ct loose
Sale price¥5,980
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.
業界発展のための後進育成や事業協力、宝石の国スリランカの子どもたちへの支援活動など、KARATZの取り組みについてご紹介いたします。
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.