Birthstone list

Gem Gacha💎Heart-shaped tourmaline 1 stone💎4mm《Multiple purchase discount available》 Sale price¥2,980

Limited to 11 stones: Sakura-shaped Contralus Opal and a specially cut Opal Gacha with one loose stone. Discounts available for multiple purchases. Sale price¥3,980

Limited to 10 stones: Unheated Sapphire (3.5mm, Round Cut) from the Theppanawa Mine, Sri Lanka. Single loose stone. Discounts available for multiple purchases. Sale price¥4,980

Limited to 8 stones: 1 loose kite cut stone (illusion sunstone, sapphire, emerald, spessartine garnet, etc.) Multiple purchase discounts available Sale price¥5,980

Central Gem Research Institute Non-heated Issuance fee for certificate of authenticity (optional) Sale price¥10,000

November birthstone citrine rough and loose stone set of 2 (Madeira citrine, from Brazil) {Multiple purchase discounts available} {For beginners} Sale price¥3,980

《Limited to 5 stones》Moonstone from Meetiyagoda, Sri Lanka (June birthstone, oval buff-top cut, 5.0×4.0mm) 1 loose stone《Multiple purchase discount available》 Sale price¥5,980

《Limited to 5 stones》Sri Lankan Moonstone from Meetiyagoda (June birthstone, round buff top cut, 4.0mm) 1 loose stone《Multiple purchase discount available》 Sale price¥5,980

[Sale 6/] 10:00 PM - Limited 11 Stones - Sri Lankan Pink Sapphire (Emerald Cut) Average 0.73ct (Multiple Purchase Discount Available) Sale price¥5,980

Limited to 5 Stones: Dragon Garnet Loose Stone (Round Cut, 5mm) - Bulk Purchase Discount Available Sale price¥8,800

《Limited 4 Stones》Needle In Blue Topaz Gacha 💎 Average 45ct《Bulk Purchase Discount Available》 Sale price¥9,800

"7-Piece Limited Edition" Mexican Opal, up to 11ct, including some with minor flaws. Multiple purchase discount available. Sale price¥3,980

Gem Gacha💎Princess cut tourmaline 1 stone💎 3mm《Multiple purchase discount available》 Sale price¥2,980

Limited to 6 stones: 1 loose unheated Sri Lankan sapphire with silk inclusions (average 0.31 carats) Multiple purchase discounts available Sale price¥4,980

[Limited to 6 stones] Contains 2 stones in total: 1 gemstone (rough stone) that is actually featured in a gemstone encyclopedia + 1 emerald rough stone. Sale price¥4,980

Limited to 8 stones: 1 Mexican fire opal loose stone with unique color (up to 2.2ct) Multiple purchase discounts available Sale price¥3,980

Limited to 6 stones: 1 Brazilian Santa Maria aquamarine (March birthstone, princess cut 2.5mm) Multiple purchase discounts available Sale price¥2,980

Madeira Citrine from Brazil (6mm, round cut, November birthstone) {Multiple purchase discounts available} Sale price¥4,980

13-stone diamond half eternity ring set (VS class, D-G color, H&C, 2.0mm) Sale price¥158,000

Limited to 7 stones: 1 loose Australian iron opal (average 7ct, October birthstone opal) Multiple purchase discounts available Sale price¥4,980

K18YG Brazilian Paraiba Tourmaline Ring (Flucche Setting, Pear Shape, Matte Finish) Sale price¥69,800

Brazilian Paraiba Tourmaline Ring and Half Eternity Ring Set (1.2mm) Sale price¥198,000

Limited to 23 stones: Ethiopian Opal, 1 loose sphere (4.5-5.0mm) - Multiple purchase discounts available Sale price¥5,980

[Option] Paraiba tourmaline analysis report attached identification certificate issuance fee Sale price¥15,000

[Sales start 8/13 10 PM] Limited to 12 Stones! Beryl Gacha where you can win a 12mm camellia-cut Limonite in Beryl or Santa Maria Aquamarine with a certificate of authenticity for 45,800 yen. (Multiple purchase discount available) Sale price¥4,580

[Lottery Sale 0521_08] Madagascar Sapphire 1.650ct Loose GIA Sale price¥158,000

《Limited to 2 Stones》Brown Diamond (4mm/0.3ct, with Certificate of Authenticity)《Multiple Purchase Discount Available》 Sale price¥5,980

1.758 ct Ruby Loose Stone from Vietnam with Identification Report Sale price¥49,800

Natural Emerald from Brazil, 15.219 ct, Loose Stone, Nichidoku Identification Report Sale price¥398,000

《Tucson New Arrival - Limited to 8 Stones》Zambian Canary Yellow Tourmaline Average 0.47ct《Bulk Purchase Discount Available》 Sale price¥7,980

[Option] Laser engraving of characters and symbols Sale price¥5,000

イエローダイヤモンド 0.188ctルース(FANCY INTENSE YELLOW, VS1)

Yellow diamond 0.188ct loose (FANCY INTENSE YELLOW, VS1) Sale price¥47,800

Mozambique Ruby 0.544ct Loose Stone with Certificate of Authenticity Sale price¥39,800

Gem Gacha💎1 cushion cut tourmaline stone💎 4mm《Multiple purchase discount available》 Sale price¥2,980

Limited to 9 stones: Tanzanite loose stone from Tanzania (5x7mm, oval cut) Multiple purchase discounts available Sale price¥12,800

Limited to 27 stones: Peridot (Trilliant Cut) 1 stone (5.0-5.5mm) Multiple purchase discounts available Sale price¥6,980

Opal 0.123ct loose stone Sale price¥5,980

Limited to 6 stones: 1 loose Madagascar needle-in topaz (average 2.1 carats) Multiple purchase discounts available Sale price¥4,980

Limited to 7 stones: 1 loose Australian boulder opal (average 25 carats) Multiple purchase discounts available Sale price¥8,800

Limited to 12 stones Tanzanian Milky Opal Cat's Eye (7.5 x 5.5 mm) Multiple purchase discounts available Sale price¥3,980

Limited to 8 stones: Swiss blue topaz (4mm, rose cut) 1 loose stone. Discounts available for multiple purchases. Sale price¥3,980

Limited to 6 stones: Aquamarine + Iolite loose stone set of 2 (March birthstone) Multiple purchase discounts available Sale price¥2,980

Mexican Hyalite Opal 2.592ct loose Sale price¥9,800

[On Sale August 23rd, 10 PM] Sri Lankan Blue Sapphire 0.286ct Loose Stone with Certificate Sale price¥14,800

[On sale 8/23 at 10 PM JST] Sri Lankan Yellow Sapphire 1.100ct Loose Stone, Japan/Germany certified Sale price¥49,800

[On sale August 25 at 10 PM] Brazilian Limonite in Topaz 5.103 ct Loose Stone Sale price¥12,800

[On sale August 25th, 10 PM] Ruby 0.168ct Loose Stone Sale price¥11,800

[On sale August 25th at 10 PM] Ruby loose stone, 0.268ct Sale price¥15,800

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.