Hey - belated welcome. I have meant to post a reply here for a few days, but haven't managed to because we have moved home and we had no internet apart from a mobile phone connection.
That's a nice ring - very typical of its period. Do you have a photo of the profile? Does it have any marks or inscriptions?
Here is our first platinum ring (I buy, my wife wears) - it's a 1960s ballerina-style by Mauboussin, Paris, with a centre sapphire of about 3.50 - 4.00 ct. We found it at an antiques fair about 10 years ago. The dealer had just bought it, and hadn't even put a price sticker on it.
Then, last year, I found a pair of matching sapphires, and I had these made
Here are all three pieces in natural light (the other photos had flash/floodlight lighting)
By the way - all the photos were also taken with a point-and-shoot (and have now been badly mauled by successive cropping and compression). A couple of tricks for you:
1. Use macro mode (usually it's a little flower symbol on a menu somewhere, or uses the word "Macro").
2. Try to have plenty of natural, diffused lighting. Use folded white paper sheets to create reflective surfaces and redirect light towards the object. In some cases I have nearly enclosed the jewellery in a "paper tent"
3. Use a light, neutral grey background - this maximises light reflection while not altering colours and giving good contrast (of course, if you have a nice bunch of flowers, or some other interesting background use that, too!)
4. If you have to use flash, it helps to put a piece of white cardboard right in front of the flash bulb, top folded out, to bounce the light against that and not the highly reflective surfaces of gems and polished metal
5. If your camera has a white balance adjustment, use it! It helps a lot to get colours looking natural
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