GIA

インターナリーフローレスダイヤモンド（H&C） 5.1mm/0.527ctルース(E, IF, 3Excellent H&C)

[Lottery Sale 0530_06] Internally Flawless Diamond (H&C) 0.527ct Loose Stone (E, IF, 3Excellent H&C) Sale price¥228,000

インターナリーフローレスダイヤモンド 0.272ctルース(D, IF, 3Excellent H&C)

[Lottery Sale 0530_03] Internally Flawless Diamond 4.2mm/0.272ct Loose (D, IF, 3Excellent H&C) GIA Sale price¥138,000

インターナリーフローレスダイヤモンド 0.217ctルース(D, IF, 3Excellent H&C)

[Lottery Sale 0530_02] Internally Flawless Diamond 3.8mm/0.217ct Loose Stone (D, IF, 3Excellent H&C) GIA Sale price¥88,000

フローレスダイヤモンド（H&C） 0.290ctルース(D, FL, 3Excellent H&C)

【Lottery Sale 0530_05】Flawless Diamond (H&C) 4.3mm/0.290ct Loose Stone (D, FL, 3Excellent H&C) GIA & Central Gem Lab Sale price¥198,000

フローレスダイヤモンド（H&C） 4.2mm/0.280ctルース(D, FL, 3Excellent H&C) GIA&中宝

【Lottery Sale 0620_09】Flawless Diamond (H&C) 4.2mm/0.280ct Loose Stone (D, FL, 3Excellent H&C) GIA&CGL Sale price¥188,000

Brazilian Paraiba Tourmaline 0.360ct Loose GIA Sale price¥298,000

[On Sale June 7, 10 PM] 0.210ct Untreated Colombian Emerald Loose Stone, GIA Certified Sale price¥228,000

[On sale June 7, 10 PM] Untreated Blue Sapphire 2.430ct Loose Gemstone GIA Sale price¥258,000

インターナリーフローレスダイヤモンド 0.320ctルース(G, IF, 3Excellent)

[On Sale May 31st at 10 PM] Internally Flawless Diamond 4.4mm/0.320ct Loose (G, IF, 3Excellent) GIA Sale price¥89,800

[Available June 12, 10 PM JST] [Colorfuri] Pt900 Thai Sapphire 1.33ct and Diamond 0.12ct Ring with GIA Report Sale price¥198,000

[On sale June 12th at 10 PM] [Colorfuri] Pt900 Madagascar Sapphire 0.99ct / Diamond 0.58ct Ring GIA Sale price¥228,000

[On sale May 20th at 10 PM] Unheated Color Change Brazilian Paraiba Tourmaline 0.050ct Loose Stone GIA Sale price¥128,000

Non-Oil Emerald 1.370ct Loose GIA Sale price¥1,580,000

インターナリーフローレスダイヤモンド（H&C） 0.360ctルース(D, IF, 3Excellent H&C)

[On sale May 12th, 10 PM JST] Internally Flawless Diamond (H&C) 4.5mm/0.360ct Loose Stone (D, IF, 3Excellent H&C) GIA & CBT Sale price¥188,000

インターナリーフローレスダイヤモンド 0.300ctルース(F, IF, 3Excellent)

[Sale on May 12th at 10 PM] Internally Flawless Diamond 4.3mm/0.300ct Loose (F, IF, 3Excellent) GIA Sale price¥98,000

フローレスダイヤモンド（H&C） 0.230ctルース(D, FL, 3Excellent H&C)

[On sale May 12, 10 PM JST] Flawless Diamond (H&C) 4.0mm/0.230ct Loose Stone (D, FL, 3Excellent H&C) GIA&CGL Sale price¥158,000

フローレスダイヤモンド（H&C） 0.210ctルース(D, FL, 3Excellent H&C)

[On sale May 12, 10 PM JST] Flawless Diamond (H&C) 3.8mm/0.210ct Loose (D, FL, 3Excellent H&C) GIA & Central Gem Lab Sale price¥148,000

[Sales start 10:00 PM on May 4th] Colombian non-oil emerald (NONE) 0.060ct loose GIA Sale price¥89,800

Burmese ruby 3.72ct loose GIA/CGL Sale price¥298,000

Unheated Brazilian Bi-Color Paraiba Tourmaline 0.105ct Loose Stone GIA (CuO:2.2% MnO:1.2%) Sale price¥198,000

[12551250] Brazilian oil-free emerald 0.120ct loose stone Sale price¥110,000

Unheated Bicolor Paraiba Tourmaline 0.092ct Loose GIA Sale price¥188,000

Colombian oil-free emerald 0.220ct loose GIA Sale price¥248,000

Colombian oil-free emerald 0.510ct loose GIA Sale price¥598,000

American oil-free red beryl 2.6mm/0.050ct loose GIA Sale price¥79,800

Brazilian unheated particolor Paraiba tourmaline 0.84ct loose GIA Sale price¥2,580,000

[On Sale 11/8 at 10 PM] K18/Pt950 Colombian Oil-Free Emerald 3.1mm/0.10ct Ring, GIA Sale price¥128,000

Russian oil-free emerald 0.570ct loose stone GIA Sale price¥298,000

Afghanistan Oil-Free Emerald 0.100ct Loose GIA Sale price¥98,000

0.060ct loose, oil-free emerald from Madagascar, GIA Sale price¥69,800

Pt900 Kashmir unheated sapphire 1.14ct / diamond 0.70ct ring GIA Sale price¥1,000,000

ブラジル産パライバトルマリン 0.620ctルース（CuO：2.72%,MnO：4.93%）GIA&中宝分析

Brazilian Paraiba Tourmaline 0.620ct loose stone (CuO: 2.72%, MnO: 4.93%) GIA & Chuho analysis Sale price¥1,580,000

ブラジル産パライバトルマリン 0.230ctルース GIA（CuO:0.9%、MnO:1.1%)

Brazilian Paraiba Tourmaline 0.230ct Loose GIA (CuO: 0.9%, MnO: 1.1%) Sale price¥158,000

K18PGブラジル産パライバトルマリン0.286ct・グランディディエライトリング GIA

K18PG Brazilian Paraiba Tourmaline 0.286ct Grandidierite Ring GIA Sale price¥198,000

Brazilian Particolor Paraiba Tourmaline 0.490ct Loose (Bicolor Paraiba Tourmaline) GIA Sale price¥398,000

Colombian oil-free emerald 0.290ct loose stone GIA Sale price¥198,000

[Option] GIA certificate issuance fee Sale price¥15,000

coming soon

【Lottery Sale 0629_07】Colombian No-Oil Emerald 0.350ct Loose GIA Sale price¥398,000

coming soon

[Lottery Sale 0629_08] Colombian Non-Oil Emerald 4.1mm/0.240ct Loose GIA Sale price¥458,000

coming soon

【32501951掲載】ダイヤモンド 0.250ctルース(D, VVS1, 3Excellent)

[Lottery Sale 0707_01] Diamond 0.250ct Loose Stone (D, VVS1, 3Excellent) GIA Sale price¥79,800

coming soon

【32501950掲載】ダイヤモンド 0.310ctルース(D, VS1, Excellent)

[Lottery Sale 0707_02] Diamond 0.310ct Loose (D, VS1, Excellent) GIA Sale price¥89,800

coming soon

[Lottery Sale 0707_09] Unheated Burmese Sapphire 0.210ct Loose GIA Sale price¥69,800

coming soon

[Lottery Sale 0707_04] Unheated Kashmir Sapphire 0.220ct Loose Stone GIA Sale price¥158,000

Sold out

Kashmir Unheated Sapphire 0.220ct Loose GIA

coming soon

[Lottery Sale 0628_08] Unheated Kashmir Sapphire 0.160ct Loose GIA Sale price¥98,000

Sold out

Unheated Kashmir Sapphire 0.120ct Loose Stone GIA

Sold out

Kashmir Sapphire 2.5mm/0.090ct Loose Stone GIA

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.