iskandar ongkojoyo

15/08/2026

14/08/2026

For the first time, fine red-to-pink spinel was available in enough quantity and size to produce matched jewelry sets – something that had never really been possible before. Stones in the 10- to 50-carat range came out of that find, flooding the market with material it had never seen at such a scale.

31/07/2026

Rubies from Mozambique display the full known spectrum of colour ranges, including the most vivid, red hue, and naturally fluoresce under UV light.

31/07/2026

31/07/2026

Ruby jewelry requires regular cleaning and care to preserve its beauty. Follow these three tips to keep your ruby jewelry shining for years to come.

- Clean Regularly: Warm water, mild soap and a soft brush are the safest cleaning options. Ultrasonic cleaners are generally safe for untreated and heat-treated rubies, but should be avoided for stones enhanced with lead glass.
- Avoid Harsh Chemicals: The filling in rubies enhanced with lead glass can be damaged by acids and household chemicals. Untreated and heat-treated rubies are more durable.
- Store With Care: Ruby is one of the hardest gemstones used in jewelry, but diamonds, other rubies and sapphires can still scratch it. Store ruby jewelry separately to help prevent damage.

Learn how to best care for your ruby jewelry on our website: https://bit.ly/3T0IEaF

27/07/2026

27/07/2026

Sekecil apapun ilmu pengetahuan maka asupan baru memberimu nilai tambah

Debra Goddard dari London barat membeli sebuah cincin di pasar loak pada tahun 1980-an seharga sekitar $13, yakin bahwa itu hanyalah perhiasan imitasi sederhana. Ia memakainya selama beberapa dekade saat berbelanja, bekerja, dan bepergian, tanpa pernah membayangkan bahwa ia memiliki permata bersejarah di tangannya.

Batu tersebut tidak berkilau seperti berlian modern karena memiliki potongan kuno, kemungkinan dari abad ke-19. Itulah sebabnya batu itu tampak kusam dan selama bertahun-tahun disangka sebagai perhiasan imitasi biasa. Ketika akhirnya diperiksa oleh para spesialis, terungkap bahwa itu adalah berlian asli seberat 26,27 karat.

Penemuan itu akhirnya dibawa ke lelang Sotheby’s, dan cincin tersebut terjual hampir $850.000. Kisah ini menjadi menarik karena pembelian murah pada hari Minggu berubah menjadi sebuah keberuntungan. Terkadang, sesuatu yang tampak biasa dapat menyimpan nilai yang sangat besar 💍