GIA Certified Royal Blue Sapphire 1.65 ct Oval 8x6 mm – Natural Loose, Thailand

Choosing a sapphire for an engagement ring? A centre stone this important should come with proof. This natural blue sapphire comes with a report from GIA, the Gemological Institute of America, so you, your partner and your jeweler know exactly what you're getting. It's a deep royal blue oval of 1.65 carats with lively flashes of brighter blue, and at about 8 × 6 mm it's a confident, classic engagement ring size.

• Natural. Certified. Royal blue. Made to be remembered.
• GIA certified natural blue sapphire, 1.65 ct oval, about 8 × 6 mm
• Deep royal blue with lively flashes of brighter blue
• Origin: Thailand, per the GIA Sapphire Origin Report; heated, as stated on the report
• GIA report number laser-inscribed on the girdle
• A loose natural blue sapphire from Thailand, sold unmounted with its GIA report. There is only one of this stone.

What the GIA report means

GIA is an independent, non-profit gemological laboratory. This Sapphire Origin Report confirms the stone is natural sapphire, gives GIA's expert opinion on its geographic origin (Thailand), and records its weight, measurements and treatment (heated). The report number is laser-inscribed on the stone, so it can always be matched to its report. You can check the number yourself on GIA's Report Check website.

For the engagement ring buyer

• 1.65 carats, a generous centre stone
• About 8 × 6 mm, which fits standard 8 × 6 mm oval settings
• Oval shape looks large face-up and flatters the hand
• Deep royal blue holds its colour indoors and in evening light
• Beautiful in a solitaire, a diamond halo or a three-stone ring
• Mohs 9 hardness, made for everyday wear
• GIA report for you, your jeweler and your insurer

A gemstone for him: the men's signet ring

At Roho Jewels, we believe men deserve beautiful gemstones too. A natural GIA-certified royal blue sapphire set into a signet ring is a bold, personal alternative to a plain metal signet: one-of-a-kind, full of character, and a ring he'll wear for decades and one day pass down.

• Signet face: at 7.95 × 5.96 mm, this stone suits a signet face of about 11–14 mm, a classic small signet or pinky ring
• Setting: flush (gypsy), bezel or half-bezel keeps it low and smooth, with no claws to catch on sleeves or gloves
• Depth: the stone is 4.03 mm deep, so ask your jeweler for a signet head at least 5 mm deep
• Metal: rich in yellow gold, sharp in white gold or platinum, rugged in oxidised sterling silver
• Wear: Mohs 9, second only to diamond, so it is tough enough for a ring worn every day
• Perfect for: husbands, fathers, grooms, graduates, milestone birthdays, or a signet he buys for himself

Why Thailand

Thailand has been a major sapphire source and trading centre for generations, known for deep, saturated blue stones.

Birthstone meaning

Sapphire is the birthstone for September and the traditional gemstone for 5th and 45th wedding anniversaries, long a symbol of loyalty, wisdom and sincerity.

Perfect for

Engagement Rings · Proposals · Christmas · September Birthdays · 5th & 45th Anniversaries · Pendants · Jewelry Designers · Men's Signet Rings · Gifts for Him

About Roho Jewels

At Roho Jewels, everything begins with the stone. Every natural gemstone we offer is hand-selected in our Toronto studio. These are real, earth-mined sapphires, rubies, emeralds and pearls, never synthetics, and every stone is described honestly so you know exactly what you're buying. Our goal is simple: real gemstones, real craftsmanship and real value, without traditional retail prices.