Birthstone list

[On Sale at 10 PM on August 7th] Colombian Emerald Rough Stone 6.590ct Sale price¥15,800

[8/12 22:00 Sale] Brazilian London Blue Topaz 0.579ct Loose Sale price¥6,980

[8/12 22:00 Sale] Brazilian London Blue Topaz 0.429ct Loose Sale price¥6,980

[8/8 22:00] Brazilian Aquamarine 0.627ct Loose Stone Sale price¥6,980

[Available at 10 PM on August 22nd] Indian Moonstone 6.2mm/0.775ct Loose Sale price¥7,980

[Available at 10 PM on August 22nd] Indian Moonstone 6.2mm/0.810ct Loose Sale price¥8,800

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） 0.416ctルース

[Available at 10 PM on August 22nd] Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 5.1mm/0.416ct Loose Stone Sale price¥15,800

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） 0.295ctルース

[Available at 10 PM on August 22nd] Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 0.295ct Loose Stone Sale price¥8,800

[On Sale at 10 PM on August 20th] Mexican Fire Opal (Faceted) 0.515ct Loose Sale price¥12,800

[12560183] Mexican Fire Opal (Faceted) 0.207ct Loose Sale price¥12,800

[On Sale at 10 PM on August 20th] Mexican Fire Opal (Faceted) 0.167ct Loose Sale price¥8,800

[On Sale at 10 PM on August 20th] Mexican Fire Opal (Faceted) 0.359ct Loose Sale price¥9,800

[On sale from 10pm on August 21st] American Peridot 0.339ct Loose Stone Sale price¥6,980

[On Sale at 10 PM on August 20th] American Peridot 0.546ct Loose Stone Sale price¥5,980

[On Sale at 10 PM on August 20th] American Peridot 0.458ct Loose Stone Sale price¥6,980

[12560198] American Peridot 0.423ct Loose Stone Sale price¥6,980

[Available from 10/8] [Limited to 7 stones] Brazilian Santa Maria Aquamarine Loose Stone [Multiple purchase discounts available] Sale price¥6,980

[Available at 10 PM on August 14th] [Limited to 10 stones] Brazilian Santa Maria Aquamarine Loose Stone [Multiple purchase discounts available] Sale price¥5,980

[On Sale at 10 PM on August 11th] 0.060ct Loose GIA Emerald from Madagascar, No Oil Sale price¥69,800

[8/11 22:00 Sale] Colombian Emerald 17.581ct Rough Stone, Japan-Germany Qualification Sale price¥45,800

ダイヤモンド（H&C） 3.8mm/0.208ctルース(G, IF, 3Excellent H&C)

[Available from 10 PM on August 11th] 3.8mm/0.208ct Internally Flawless Diamond (H&C) Loose Stone (G, IF, 3 Excellent H&C) Sale price¥69,800

[On Sale at 10 PM on August 11th] Afghanistan Oil-Free Emerald 0.100ct Loose GIA Sale price¥98,000

[Available from 10 PM on August 12th] 18K Yellow Gold Myanmar Jadeite 0.434ct Emerald Ring Sale price¥89,800

[Available at 10 PM on August 12th] 18K Yellow Gold Colombian Emerald 0.062ct Diamond Ring Sale price¥79,800

[Available at 10 PM on August 13th] [Camellia Cut] Ethiopian Opal 5.083ct/14mm Loose Sale price¥69,800

[Available at 10 PM on August 15th] Sri Lankan Twin Star Sapphire 3.242ct Loose Sale price¥59,800

[Available at 10 PM on August 16th] 18K/Pt950 Colombian Oil-Free Emerald 3.2mm/0.10ct Ring, GIA Sale price¥128,000

[On sale at 10pm on August 16th] Pt950 Tanzanian Bicolor Sapphire 0.398ct Paraiba Tourmaline Ring Sale price¥128,000

[On Sale at 10 PM on August 16th] 0.570ct Loose Oil-Free Russian Emerald, GIA Sale price¥298,000

ソルトアンドペッパーダイヤモンド 5.2mm/0.863ctルース（カボションカット）

Salt and Pepper Diamond 5.2mm/0.863ct Loose Cabochon Cut Diamond (Available August 17th at 10 PM) Sale price¥98,000

[On Sale at 10 PM on August 16th] Unheated Padparadscha Sapphire 3.9mm/0.290ct Loose GIA Sale price¥55,800

[8/16 22:00 Sale] Sri Lankan Yellow Sapphire 0.300ct Loose Sale price¥15,800

[On Sale at 10 PM on August 16th] Mexican Cantera Opal 5.882ct Loose Sale price¥39,800

[Available at 10 PM on August 16th] Brazilian Rainbow Aquamarine (Iridescent Aquamarine) 1.271ct Loose Stone (Heart Shape) Sale price¥8,800

[Available at 10 PM on August 16th] Brazilian Rainbow Aquamarine (Iridescent Aquamarine) 1.550ct Loose Stone (Heart Shape) Sale price¥9,800

[On Sale at 10 PM on August 16th] Brazilian Rainbow Aquamarine (Iridescent Aquamarine) 1.309ct Loose Stone Sale price¥9,800

[On Sale at 10 PM on August 16th] Brazilian Rainbow Aquamarine (Iridescent Aquamarine) 2.287ct Loose Stone (Heart Shape) Sale price¥14,800

[On Sale at 10 PM on August 16th] Brazilian Rainbow Aquamarine (Iridescent Aquamarine) 2.733ct Loose Stone (Heart Shape) Sale price¥18,800

[On Sale at 10 PM on August 16th] Brazilian Rainbow Aquamarine (Iridescent Aquamarine) 1.764ct Loose Stone Sale price¥12,800

[On Sale at 10 PM on August 16th] Brazilian Rainbow Aquamarine (Iridescent Aquamarine) 0.901ct Loose Stone Sale price¥3,980

[Available at 10 PM on August 17th] Brazilian Rainbow Aquamarine (Iridescent Aquamarine) 2.222ct Loose Stone (Heart Shape) Sale price¥15,800

[On Sale at 10 PM on August 17th] Brazilian Rainbow Aquamarine (Iridescent Aquamarine) 1.153ct Loose Stone Sale price¥8,800

[On Sale at 10 PM on August 17th] Mexican Cantera Opal 2.125ct Loose Sale price¥39,800

[On Sale at 10 PM on August 17th] Brazilian Rainbow Aquamarine (Iridescent Aquamarine) 1.267ct Loose Stone Sale price¥8,800

[On sale at 10pm on August 19th] Sliced Trapiche Diamond 0.228ct Loose Sale price¥18,800

Colombian emerald cat's eye 0.417ct loose Sale price¥39,800

Diamond 2.810ct rough stone Sale price¥9,800

[Posted in 12530233] Canary Yellow Diamond (Treatment) 0.029ct Loose Sale price¥5,980

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の取り組みと社会貢献

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.