Diamond rings: what determines their value?

A diamond ring can be a simple, timeless piece or an interesting vintage jewel. At Østlandet Brukt & Antikk, we assess the complete ring: diamond quality, gold content, construction, period, maker and overall design.

The four Cs

Diamonds are traditionally assessed using four characteristics: Carat, Cut, Color and Clarity.

• Carat: gemstone weight. One carat equals 0.2 grams. Equal carat weights do not necessarily mean equal values.
• Cut: the quality of cutting affects how a diamond reflects light.
• Colour: for conventional white diamonds, the amount of body colour is assessed.
• Clarity: internal and external characteristics are considered according to their number, size and position.

The complete ring matters

An older setting, fine goldsmithing, substantial gold content, a maker's mark or distinctive design may add interest beyond the metal and stone alone. Assess an older piece as a complete jewel before considering its scrap value.

What do 585 and 750 mean?

585 normally indicates 14-carat gold, containing 58.5% gold. 750 indicates 18-carat gold and 75% gold. These gold fineness descriptions should be distinguished from the diamond's carat weight.

Gold can be yellow, white or rose according to its alloy and treatment. OBA uses XRF analysis as one tool for examining metal composition. Our XRF guide explains its use and limitations.

Vintage rings have their own character

Settings, craftsmanship and period details can help explain how a piece was made. The appeal of an older ring may lie in its individual design.

Examples from OBA

Our shop has featured diamond rings in several styles, including a white-gold ring with 16 diamonds and a stated total diamond weight of approximately 0.48 ct. The total refers to the diamonds in that ring.

See photographs and details of the 16-diamond ring. The listing shows current availability and condition.

Our selection changes as individual pre-owned pieces sell. Browse gold rings currently available.

Inherited a diamond ring?

Keep boxes, papers and known history with the ring. Marks inside the band can give information about gold content or maker, while the stones and construction require closer examination. Avoid melting, dismantling or major alteration before the complete piece is assessed.

Frequently asked questions

Is a larger diamond always more valuable?

Carat weight is one factor. Cut, colour, clarity, documentation and demand also matter.

What does 585 mean?

It normally describes 14-carat gold, containing 58.5% gold.

What does 750 mean?

It normally describes 18-carat gold, containing 75% gold.

Can a vintage ring be worth more than its gold content?

Gemstones, maker, period, design, workmanship and demand may give the finished piece a higher resale value.

Considering a sale?

Østlandet Brukt & Antikk buys and assesses gold jewellery, diamond rings and gemstone-set pieces. Contact us with photographs and details. Our photography guide explains useful views.