























[On sale May 22nd at 10 PM] Synthetic Alexandrite 4.3mm/0.379ct Loose Stone
Alexandrite is also known as "the king of jewels." Its color change from green to red makes it a mystical gemstone, often called "emerald by day, ruby by night." This particular item is a "synthetic stone." Enjoy the color change using a red color-changing penlight.
This is a 4.3mm round cut synthetic alexandrite, polished by Sri Lankan craftsman Mr. Sanje. It features a meticulous and well-balanced cut that minimizes color fading when viewed from the front. The vivid color change, unique to synthetic alexandrite, is also a charming feature.
・Type: Loose Stone (Synthetic stone, man-made stone, treated stone)
・Stone Name: Synthetic Alexandrite (Synthetic Stone)
・Weight: 0.379ct
・Size: 4.3×4.3㎜
・Shape: Round Cut
・Scratches/Chips: S
・Inclusions: S
・Remarks: ---
・Accessories: Karatz Quality Guarantee, Loose Stone Case (If it does not fit, a clear zipper case)
▷Jewelry Processing Available
If you would like jewelry processing, please order it along with your desired setting from the link below.
・【Choose Your Stone】Simple Order
・【Choose Your Stone】Semi-Order
※If you would like an image of the stone on a setting, want to discuss a full custom order, or have any other questions, please feel free to contact us here.
※Rough stones are not eligible. Also, some stones may not be eligible.
※While we strive to ensure that the photos are the same color as the actual product, there may be slight differences due to lighting conditions during photography or your monitor environment. Also, some photos may be taken using a penlight.
※For details on scratches/chips, treatments, and inclusions, please see here.
※For other frequently asked questions, please see here.
karatz_item_id: 12562927
Choose options






























![[6/ 10 PM JST Release] 《Limited to 11 Stones》Bicolor Gemstone Gacha featuring Paraiba Tourmaline and Euclase 《Bulk Purchase Discount Available》](http://store.karatz.jp/cdn/shop/files/2026-08-0914.21.02.png?v=1786252887&width=1343)
![[Use the #202509 Campaign] 2025 New Year's Lucky Bag 🎍 Gem Gacha Lucky Bag with 4 or more gemstones (worth ¥25,000) [Discount for bulk purchase of lucky bags]](http://store.karatz.jp/cdn/shop/files/gazou.png?v=1785994448&width=1254)
![[On Sale 10 PM, June 7] *Limited to 3 Sets* 1.0ct/D/VS-VVS/IDEAL Lab-Grown Diamond (Synthetic Diamond) & 2 Rare Cabochon Stones (Total of 3 Stones Included) *Multiple Purchase Discount Available*](http://store.karatz.jp/cdn/shop/files/collage_07f6900d-fa8d-4bc4-acda-dc4cf0e8fed7.png?v=1785923452&width=4000)
![[On sale May 23rd at 10 PM] "Limited 9 Stones - Shinjuku Pop-Up Celebration" All stones with Central Gem Laboratory sorting (3.0-3.5mm, VS-SI clarity) "Multiple purchase discount available"](http://store.karatz.jp/cdn/shop/files/collage_0f6126db-fe6e-4ec4-ab15-e86a0e08371b.png?v=1786253811&width=2000)
![[Posted on 12563959] Madagascar Padparadscha Sapphire 0.164ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P7241965_cec751e0-3766-4ff6-a740-715fc57f7e8e.jpg?v=1786398430&width=2936)




















![[Jeweler's tools] 4-piece set including loupe (10x magnification), tweezers, and 2 loose stones](http://store.karatz.jp/cdn/shop/files/P4130575.jpg?v=1776126091&width=4000)